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Understanding the IRQ assignments table for my new ASUS A7V880 MB...
I've been building my own systems for about five years now but one thing has
always left me guessing as to exactly what information is being conveyed by the tables that appear in every MB manual I've seen regarding the expansion slots and which ones share IRQs. Here is the table from the MB manual and it seems to do nothing but confuse me so I am here hoping someone can explain exactly what this information means: INT A INT B INT C INT D ---------------------------------------------------------------------------- ------ PCI slot 1 --- --- --- used PCI slot 2 red --- --- --- PCI slot 3 --- sed --- --- PCI slot 4 --- --- hared --- PCI slot 5 red --- --- --- Gigabit LAN --- --- hared --- AGP slot (8x) --- --- --- OK here's the thing, every other time I've seen these tables they have had all the columns filled in. So my questions a How does INT A, INT B, INT C, and INT D relate to the IRQ asigned to a device in a particular slot. And what do they mean by "used" (I hope this does not mean I can't install a card into PCI slots 1 and 3). And finally, how do I determine which of these are *really* "shared" slots (I sure hope the AGP isn't shared with slots 2 and 5). And one final question: How do I determine if a certain device driver supports IRQ sharing? I want to configure this system with Windows-XP PRO and the following add-on cards: (1) ASUS V9180 Magic GeForce MX 440 8X AGP (for primary display) (2) Visiontek GeForce4 MX420 PCI (for second display) (3) ATI TV Wonder Value Edition PCI (TV-Tuner and Video Capture) (4) 3Com/US Robotics 56Kbps VOICE/FAX modem PCI (FAX & digital answering machine) (5) ADI AD1888 SoundMAX 6-channel audio with S/PDIF-out interface (onboard) (6) Marvell 88E8001 Gigabit LAN adapter (onboard) ----- You may send e-mail if you wish provided it is NOT SPAM. To decode my valid E-mail address, you will need to remove the NOSPAM. and the 666. I had to get complicated as spammers are now doing the obvious removal of the word "NOSPAM" to compile their lists of e-mails... - G.L. Cross |
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G.L. Cross schrieb:
I've been building my own systems for about five years now but one thing has always left me guessing as to exactly what information is being conveyed by the tables that appear in every MB manual I've seen regarding the expansion slots and which ones share IRQs. Here is the table from the MB manual and it seems to do nothing but confuse me so I am here hoping someone can explain exactly what this information means: [garbled table deleted] I preferred to d/l the PDF manual... And please, check your line breaks. It appears PCI slots 1 and 3 do not share an INT line with anything else, so you should put interrupt sharing unfriendly cards into these. Slot 4 shares an INT line with the Gb LAN (I wouldn't put anything bandwidth intensive into that one), while 2 and 5 share one with the AGP card. final question: How do I determine if a certain device driver supports IRQ sharing? You try out. Frequently it's not only a matter of the device itself, the drivers also play an important role - there have been cases where a card absolutely despises interrupt sharing in Windows but miraculously worked fine in Linux. I want to configure this system with Windows-XP PRO and the following add-on cards: (1) ASUS V9180 Magic GeForce MX 440 8X AGP (for primary display) Nvidia chips are usually not very keen on interrupt sharing. (2) Visiontek GeForce4 MX420 PCI (for second display) (3) ATI TV Wonder Value Edition PCI (TV-Tuner and Video Capture) Put that one into one of the non-shared slots. Same goes for the 2nd graphics card, I suppose. (4) 3Com/US Robotics 56Kbps VOICE/FAX modem PCI (FAX & digital answering machine) This can probably live happily next to the Gb LAN. You may send e-mail if you wish provided it is NOT SPAM. To decode my valid [snip] It would probably be easier to get a Yahoo! mail account, where you can set up disposable trash addresses. You may want to choose one containing "nospam"... Stephan -- Meine Andere Seite: http://stephan.win31.de/ PC#6: i440BX, 1xP3-500E, 512 MiB, 18+80 GB, R9k AGP 64 MiB, 110W This is a SCSI-inside, Legacy-plus, TCPA-free computer Mail to From: not read, see homepg. | Real gelesene Mailadr. s. Homep. |
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"Stephan Grossklass" wrote in message ... [garbled table deleted] I preferred to d/l the PDF manual... And please, check your line breaks. It was fine when it went out but I noticed the post when it showed up and sent a cancel request for the first one. I guess you didn't notice the repost I put out 46 minutes later... Is there some reason why I should leave the "automatically wrap text at" setting to 76 characters? That's what happened to me the first time (those true-type fonts) and it garbled the table... It appears PCI slots 1 and 3 do not share an INT line with anything else, so you should put interrupt sharing unfriendly cards into these. Slot 4 shares an INT line with the Gb LAN (I wouldn't put anything bandwidth intensive into that one), while 2 and 5 share one with the AGP card. Here's the thing that never got explained to me: this table implies that each slot has four "INT lines" but I don't get the relationship between what this means (hardware design-wise) and how these INT A, INT B, INT C, etc. relate in any way to the sharing of IRQs. Plus the use of the word "used" I've never run across before... final question: How do I determine if a certain device driver supports IRQ sharing? You try out. Frequently it's not only a matter of the device itself, the drivers also play an important role - there have been cases where a card absolutely despises interrupt sharing in Windows but miraculously worked fine in Linux. I want to configure this system with Windows-XP PRO and the following add-on cards: (1) ASUS V9180 Magic GeForce MX 440 8X AGP (for primary display) Nvidia chips are usually not very keen on interrupt sharing. This fact I am already aware of. Also they sometimes get unstable (at least some of the older ones) if you enable the "Read Around Write" BIOS setting of the VIA chipset. I do not know if this issue has been resolved with the newer Nvidia chips or not. All that aside, Nvidia makes some damn good video chips (the GeForce MX 440 is capable of real-time full-screen antialiasing at a quality I've never seen before and a 200Hz refresh rate at 1024x768 resolution in 32-bit color). (2) Visiontek GeForce4 MX420 PCI (for second display) (3) ATI TV Wonder Value Edition PCI (TV-Tuner and Video Capture) Put that one into one of the non-shared slots. Same goes for the 2nd graphics card, I suppose. (4) 3Com/US Robotics 56Kbps VOICE/FAX modem PCI (FAX & digital answering machine) This can probably live happily next to the Gb LAN. Yes, this is how I was planning to arrange them: AGP === ASUS video card PCI-1 === Visiontek video card PCI-2 === Two additional USB ports cabled to MB header (PCI-2 unused) PCI-3 === ATI TV-Tuner / video capture card PCI-4 === 56Kbps voice/fax modem PCI-5 === (unused) It would probably be easier to get a Yahoo! mail account, where you can set up disposable trash addresses. You may want to choose one containing "nospam"... Funny! I did that once already. After returning from a two-week vacation, I had over 800 SPAM messages, the vast majority of them porno... |
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In article , "G.L. Cross"
wrote: I've been building my own systems for about five years now but one thing has always left me guessing as to exactly what information is being conveyed by the tables that appear in every MB manual I've seen regarding the expansion slots and which ones share IRQs. Here is the table from the MB manual and it seems to do nothing but confuse me so I am here hoping someone can explain exactly what this information means: INT A INT B INT C INT D ------------------------------------------------------------------- ------ PCI slot 1 --- --- --- used PCI slot 2 red --- --- --- PCI slot 3 --- sed --- --- PCI slot 4 --- --- hared --- PCI slot 5 red --- --- --- Gigabit LAN --- --- hared --- AGP slot (8x) --- --- --- OK here's the thing, every other time I've seen these tables they have had all the columns filled in. So my questions a How does INT A, INT B, INT C, and INT D relate to the IRQ asigned to a device in a particular slot. And what do they mean by "used" (I hope this does not mean I can't install a card into PCI slots 1 and 3). And finally, how do I determine which of these are *really* "shared" slots (I sure hope the AGP isn't shared with slots 2 and 5). And one final question: How do I determine if a certain device driver supports IRQ sharing? I want to configure this system with Windows-XP PRO and the following add-on cards: (1) ASUS V9180 Magic GeForce MX 440 8X AGP (for primary display) (2) Visiontek GeForce4 MX420 PCI (for second display) (3) ATI TV Wonder Value Edition PCI (TV-Tuner and Video Capture) (4) 3Com/US Robotics 56Kbps VOICE/FAX modem PCI (FAX & digital answering machine) (5) ADI AD1888 SoundMAX 6-channel audio with S/PDIF-out interface (onboard) (6) Marvell 88E8001 Gigabit LAN adapter (onboard) ----- You may send e-mail if you wish provided it is NOT SPAM. To decode my valid E-mail address, you will need to remove the NOSPAM. and the 666. I had to get complicated as spammers are now doing the obvious removal of the word "NOSPAM" to compile their lists of e-mails... - G.L. Cross INT A INT B INT C INT D PCI slot 1 ‹ ‹ ‹ used PCI slot 2 shared ‹ ‹ ‹ PCI slot 3 ‹ used ‹ ‹ PCI slot 4 ‹ ‹ shared ‹ PCI slot 5 shared ‹ ‹ ‹ Gigabit LAN ‹ ‹ shared ‹ AGP slot shared ‹ ‹ ‹ How does INT A, INT B, INT C, and INT D relate to the IRQ asigned to a device in a particular slot. I have a sneaking suspicion that this table only represents about 1/4 of all the wiring information on the motherboard. One of the chipset chips has an interrupt controller on it, and the mislabelled four columns above represent the path the four wires take. Now, the thing is, a PCI card has four interrupt signals on it. A primary and three non-primary signals. From the PCI 2.2. spec: INTA# Interrupt A is used to request an interrupt. INTB# Interrupt B is used to request an interrupt and only has meaning on a multi-function device. and so on for INTC# and INTD# What I think the Asus table is showing above, is how only the INTA# pin on each slot, is connected to the four wires streaming from the interrupt controller. So, in fact, the Asus table doesn't show how a multi-function device would be sharing interrupts. The normal practice in the PCI world is to "swizzle" the connections. This is a regular diagonal connection pattern, intended to equalize the interconnect. It is something like this. (Note: Example truncated to fit onto one line each.) S1 INTA# -- S2 INTB# -- S3 INTC# -- S4 INTD# -- S5 INTA# -- PIRQA# S1 INTB# -- S2 INTC# -- S3 INTD# -- S4 INTA# -- S5 INTB# -- PIRQB# S1 INTC# -- S2 INTD# -- S3 INTA# -- s4 INTB# -- S5 INTC# -- PIRQC# S1 INTD# -- S2 INTA# -- S3 INTB# -- S4 INTC# -- S5 INTD# -- PIRQD# The Asus table is basically only communicating what is happening to INTA# on each card (the primary interrupt). In my swizzle example above, slot1 and slot5 share a physical interrupt line, namely PIRQA#. Asus would mark slot1 and slot5 as "sharing" that signal. Since the PIRQB# signal only has Slot4's INTA# connected to it, Asus would use the word "used" when they should be using the word "unique" or "unshared" instead. To see the swizzle pattern for yourself, see pg.22 of this schematic, and notice how the signals change in an orderly fashion for the INTx#'s http://www.intel.com/design/chipsets...x/BXDPDG10.PDF And what do they mean by "used" (I hope this does not mean I can't install a card into PCI slots 1 and 3). Translate "used" to "unshared" or "unique". Slot 1 or slot 3 is an excellent location for a Sound Card with a poorly written interrupt handler, on your A7V880. And finally, how do I determine which of these are *really* "shared" slots (I sure hope the AGP isn't shared with slots 2 and 5). But the AGP _is_ sharing with slot 2 and slot 5. When physical signals are shared, the numeric IRQ assigned by the OS has to be the same for all the devices sharing that signal. Each handler executes sequentially until the PIRQ signal is found to be deasserted - at least that is my understanding of how sharing works. ------------------ Example from Abxzone - P4C800 Deluxe (3C940 Lan on original deluxe) http://abxzone.com/forums/showthread.php?t=48495 A B C D E F G H PCI slot 1 ‹ ‹ ‹ ‹ ‹ shared ‹ ‹ PCI slot 2 ‹ ‹ ‹ ‹ ‹ ‹ shared ‹ PCI slot 3 ‹ ‹ ‹ ‹ ‹ ‹ ‹ shared PCI slot 4 ‹ ‹ ‹ ‹ shared ‹ ‹ ‹ PCI slot 5 ‹ ‹ ‹ ‹ ‹ shared ‹ ‹ AGP Pro shared used ‹ ‹ ‹ ‹ ‹ ‹ USB HC0 shared ‹ ‹ ‹ ‹ ‹ ‹ ‹ USB HC1 ‹ ‹ ‹ used ‹ ‹ ‹ ‹ USB HC2 ‹ ‹ used ‹ ‹ ‹ ‹ ‹ USB HC3 shared ‹ ‹ ‹ ‹ ‹ ‹ ‹ USB 2.0 ‹ ‹ ‹ ‹ ‹ ‹ ‹ shared LAN ‹ ‹ ‹ ‹ ‹ ‹ shared ‹ SATA ‹ ‹ ‹ ‹ ‹ ‹ ‹ shared 1394 ‹ ‹ ‹ ‹ shared ‹ ‹ ‹ "Using the onboard LAN. Using USB. Disabled the firewire. Disabled on-board sound. Firewire card in PCI-3. Audigy1 in Slot #4. I have the Radeon on the AGP." I think his Audigy is actually in Slot 2. Firewire in Slot 3. Resulting Windows IRQ assignment - OCRed to table below: http://abxzone.com/forums/attachment...achmentid=4677 Resource Device status IRQ 0 System timer OK IRQ 1 Standard 101/102-Key or Microsoft Natural PS/2 Keyboard OK IRQ 3 Communications Port (COM2) OK IRQ 4 Communications Port (COMl) OK IRQ 6 Standard floppy disk controller OK IRQ 8 System CMOS/real time clock OK IRQ 9 Microsoft ACPI-Compliant System OK IRQ 10 Intel(R) 82801EB SMBus Controller - 24D3 OK IRQ 12 Microsoft PS/2 Mouse OK IRQ 13 Numeric data processor OK IRQ 14 Primary IDE Channel OK IRQ 15 Secondary IDE Channel OK IRQ 16 RADEON 9700 PRO OK IRQ 16 Standard Universal PCI to USB Host Controller OK IRQ 16 Standard Universal PCI to USB Host Controller OK IRQ 18 Standard Universal PCI to USB Host Controller OK IRQ 19 Standard Universal PCI to USB Host Controller OK IRQ 21 Promise Technology Inc. Ultra IDE Controller OK IRQ 22 3Com Gigabit LOM (3C940) OK IRQ 22 Creative SB Audigy OK IRQ 23 Standard Enhanced PCI to USB Host Controller OK IRQ 23 OHCI Compliant IEEE 1394 Host Controller OK IRQ 23 Texas Instruments OHCI Compliant IEEE 1394 Controller OK Things to note: 1) The Promise controller on IRQ 21, suggest the Asus table is wrong and the Promise is actually on wire "F". 2) IRQ 22 occurs twice, and must match, because 3C940 and Audigy are sharing via Slot 2. 3) IRQ 23 shows two Firewire devices and a USB2. Notice again how the Asus table is wrong. Maybe the SATA and onboard Firewire should be switched in the Asus table ? 4) Standard assignments are IRQ0-IRQ15. PCI devices start above those. IRQ16 to 19 seem to correspond to wires A thru D. IRQ20 to 23 seem to correspond to wires E thru H. The five PCI slots can only use IRQ20 to 23. Notice that the P4C800 Deluxe interrupt controller has eight wires, and yours has four wires. It doesn't change the fact that both boards use sharing. Moral of the story ? Load up the system with hardware first, then look in the Device Manager or use a utility like Sandra, to examine the IRQ assignments. Mark up the manual to reflect the real wiring. Reassign cards, according to your knowledge of cards known not to play nice. In my readings on the newsgroup so far, only a sound card really needs a private IRQ. one final question: How do I determine if a certain device driver supports IRQ sharing? Devices with high data thruput, or real time requirements, may have data overruns, data underruns, cause havoc via delays or freezes etc. If your system is misbehaving, start looking... No hardware manufacturer is going to admit they have a problem. Sharing is a requirement, after all, and they cannot admit to such a shortcoming. I want to configure this system with Windows-XP PRO and the following add-on cards: (1) ASUS V9180 Magic GeForce MX 440 8X AGP (for primary display) (2) Visiontek GeForce4 MX420 PCI (for second display) (3) ATI TV Wonder Value Edition PCI (TV-Tuner and Video Capture) (4) 3Com/US Robotics 56Kbps VOICE/FAX modem PCI (FAX & digital answering machine) INT A INT B INT C INT D PCI slot 1 ‹ ‹ ‹ used PCI slot 2 shared ‹ ‹ ‹ PCI slot 3 ‹ used ‹ ‹ PCI slot 4 ‹ ‹ shared ‹ PCI slot 5 shared ‹ ‹ ‹ Gigabit LAN ‹ ‹ shared ‹ AGP slot shared ‹ ‹ ‹ You are using onboard sound, so no worry about finding a unique signal for a sound card. Modem card probably has a data pump (non-Winmodem), so will be interrupting when a FIFO of data bytes is ready. TV Tuner might be pumping a fair amount of data on the PCI bus, but doesn't have a good reason to be using its interrupt line. Here are my choices: AGP MX440 AGP (low power card - cooling not an issue) Slot1 MX420 PCI (higher priority than other PCI slots) Slot2 Slot3 USR modem card (unique IRQ, no sharing, low latency) Slot4 ATI TV Wonder Tuner PCI Slot5 I don't really know if the TV Wonder uses interrupts. Once slot1 and slot3 are assigned, the other slots kinda stink. Sharing with the AGP card doesn't sound like fun. Sharing with the LAN would be bad practice as well, only because the interrupt rate on the LAN could be high. I placed the card in slot4, on the assumption that with the modem, you might not be using the LAN. If you are using the LAN, do a file transfer from another PC, with the TV Tuner running or not running, and see if there is a performance difference. Performance tuning will help you decide on a final placement. If the MX440 runs hotter than I think it does, then try swapping the USR modem card and the MX420. If the USR card is smaller than the MX420, maybe it will leave more room for air movement. When I refer to cooling issue, I mean if there is a FX5900 or an ATI 9800 in the AGP slot, you might not want a PCI card in slot 1. I don't know what I'd do if that was the case. Also, if you want a real laugh, download a few more Asus manuals. For example, the PC-DL is a desktop server board, and uses an 875 Northbridge, like the P4C800 Deluxe example above. Look how the tech writer did the table: INTA# INTB# INTC# INTD# PCI slot 1 IRQ_F# IRQ_G# IRQ_H# IRQ_F# PCI slot 2 IRQ_G# IRQ_H# IRQ_E# IRQ_F# PCI slot 3 IRQ_G# IRQ_E# IRQ_F# IRQ_F# PCI slot 4 IRQ_E# IRQ_F# IRQ_G# IRQ_F# PCI slot 5 IRQ_F# IRQ_G# IRQ_H# IRQ_F# AGP Pro IRQ_A# IRQ_B# ‹ ‹ Onboard USB1 IRQ_A# ‹ ‹ ‹ Onboard USB2 IRQ_D# ‹ ‹ ‹ Onboard USB3 IRQ_C# ‹ ‹ ‹ Onboard USB4 IRQ_A# ‹ ‹ ‹ Onboard USB2.0 IRQ_H# ‹ ‹ ‹ Onboard LAN IRQ_F# ‹ ‹ ‹ Onboard 20378R IRQ_H# ‹ ‹ ‹ Onboard IDE IRQ_C# Onboard ICH5R IRQ_C# ‹ ‹ ‹ Onboard 1394 IRQ_E# ‹ ‹ ‹ Onboard AD1985 IRQ_B# Notice how in this example, the table attempts to show all the wiring. You have to rearrange the info from the first column, to make a table similar to the ones found in other Asus desktop motherboard manuals. Also note, how even the AC97 Codec is shown to have an interrupt, although other manuals never show this. The swizzle pattern for the PCI slots, is, in a word, nuts. Every manual I read, just creates more mysteries. HTH, Paul |
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"Paul" wrote in message ... Now, the thing is, a PCI card has four interrupt signals on it. A primary and three non-primary signals. From the PCI 2.2. spec: INTA# Interrupt A is used to request an interrupt. INTB# Interrupt B is used to request an interrupt and only has meaning on a multi-function device. and so on for INTC# and INTD# What I think the Asus table is showing above, is how only the INTA# pin on each slot, is connected to the four wires streaming from the interrupt controller. So, in fact, the Asus table doesn't show how a multi-function device would be sharing interrupts. Thanks! I "think" I see what is going on now though I'll have to look over what you are saying some more. Translate "used" to "unshared" or "unique". Slot 1 or slot 3 is an excellent location for a Sound Card with a poorly written interrupt handler, on your A7V880. I am planning on using the onboard 6-channel sound. Seems to me that disabling it and then adding a different sound card - seems kind of "wasteful" since nowadays most onboard sound setups sound just fine to me (unless you are going to be a musician and need MIDI capability and lots of simultaneous "voices" to compose complex music... (just a thought). Resulting Windows IRQ assignment - OCRed to table below: http://abxzone.com/forums/attachment...achmentid=4677 Resource Device status IRQ 0 System timer OK IRQ 1 Standard 101/102-Key or Microsoft Natural PS/2 Keyboard OK IRQ 3 Communications Port (COM2) OK IRQ 4 Communications Port (COMl) OK IRQ 6 Standard floppy disk controller OK IRQ 8 System CMOS/real time clock OK IRQ 9 Microsoft ACPI-Compliant System OK IRQ 10 Intel(R) 82801EB SMBus Controller - 24D3 OK IRQ 12 Microsoft PS/2 Mouse OK IRQ 13 Numeric data processor OK IRQ 14 Primary IDE Channel OK IRQ 15 Secondary IDE Channel OK IRQ 16 RADEON 9700 PRO OK IRQ 16 Standard Universal PCI to USB Host Controller OK IRQ 16 Standard Universal PCI to USB Host Controller OK IRQ 18 Standard Universal PCI to USB Host Controller OK IRQ 19 Standard Universal PCI to USB Host Controller OK IRQ 21 Promise Technology Inc. Ultra IDE Controller OK IRQ 22 3Com Gigabit LOM (3C940) OK IRQ 22 Creative SB Audigy OK IRQ 23 Standard Enhanced PCI to USB Host Controller OK IRQ 23 OHCI Compliant IEEE 1394 Host Controller OK IRQ 23 Texas Instruments OHCI Compliant IEEE 1394 Controller OK Interesting... I've always thought the IRQs stopped at #15. When did this change take place? I've always thought they needed to extend the number of available IRQs but I couldn't think of how it could be done with all the "legacy" stuff out there. Moral of the story ? Load up the system with hardware first, then look in the Device Manager or use a utility like Sandra, to examine the IRQ assignments. Mark up the manual to reflect the real wiring. Reassign cards, according to your knowledge of cards known not to play nice. In my readings on the newsgroup so far, only a sound card really needs a private IRQ. Would it not degrade performance if one or more high-data rate devices (like the two video cards) shared an IRQ? You are using onboard sound, so no worry about finding a unique signal for a sound card. Modem card probably has a data pump (non-Winmodem), so will be interrupting when a FIFO of data bytes is ready. TV Tuner might be pumping a fair amount of data on the PCI bus, but doesn't have a good reason to be using its interrupt line. Here are my choices: AGP MX440 AGP (low power card - cooling not an issue) Slot1 MX420 PCI (higher priority than other PCI slots) Slot2 Slot3 USR modem card (unique IRQ, no sharing, low latency) Slot4 ATI TV Wonder Tuner PCI Slot5 I will be using the onboard LAN connected to a Microsoft 802.11g/Wi-Fi Wireless-G router to share my cable modem connection with two "wired" systems (mine and my roommate's) and also allow me to wirelessly connect to the Internet from my Hp Pavilion 7000 series notebook. The FAX/VOICE modem is there primarily to send and receive FAX'es which comes in useful a lot. So with that in mind, I'd think about swapping the locations for the modem and the TV Tuner / Video Capture card (one of the reasons I'm putting together a two-display system: full screen TV on one monitor while I work at the other). Also the extra screen realestate can sure come in handy when you've got say a dozen open windows at once. Also, if you want a real laugh, download a few more Asus manuals. For example, the PC-DL is a desktop server board, and uses an 875 Northbridge, like the P4C800 Deluxe example above. Look how the tech writer did the table: [table omitted] Every manual I read, just creates more mysteries. I know what you mean. I was quite disappointed with the quality of the manual for this MB. It certainly was not up to ASUS or ABit's usual standards. |
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