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#21
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On Wed, 11 May 2005 09:13:16 +0200, David Rasmussen wrote:
I've tried version 1004, 1006 and 1007 (newest). No dice So if I bought a new system with the same RAM, the same CPU, the same motherboard, should I expect to be able to overclock more? And if so, which part of my current system is at fault? And if not, why not? I want to overclock my CPU, damnit! Everybody else is getting 2.4-2.6 GHz I'd say the MB is what's holding you back. I don't think you could find a CPU that wouldn't do at least 9x233. And if you lowered ram to the lowest speed, it's probably not that. Here's more info. http://forums.anandtech.com/messagev...readid=1562941 http://forums.anandtech.com/messagev...readid=1512756 One message from the above link. Well I used this one http://forums.anandtech.com/messagev...readid=1497607 "Quick and dirty A64 clocking guide" over the weekend and am running my A64 3000+ @ 2430 (9x270) with just a little room. (Many thanks to Zebo for demystifying OC'ing) Here's what my settings are BIOS=1002 (my pci lock works as documented) FSB = 270 CPU Multipier = 9x HTT = 3x vCore = 1.50V DIMM = 2.85V Memory locked at 333Mhz CAS = 2.5 RAS to CAS = 3 Row Precharge = 3 Min RAS cycle = 6 So I guess that's 2.5-3-3-6 From this, I'd say you just don't have something right. -- Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB) My server http://wesnewell.no-ip.com/cpu.php Verizon server http://mysite.verizon.net/res0exft/cpu.htm |
#22
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Wes Newell wrote:
I'd say the MB is what's holding you back. Okay. I don't think you could find a CPU that wouldn't do at least 9x233. That's what I gather too, reading around on the net. And if you lowered ram to the lowest speed, it's probably not that. Agreed. Here's more info. http://forums.anandtech.com/messagev...readid=1562941 http://forums.anandtech.com/messagev...readid=1512756 I will check those. One message from the above link. Well I used this one http://forums.anandtech.com/messagev...readid=1497607 "Quick and dirty A64 clocking guide" over the weekend and am running my A64 3000+ @ 2430 (9x270) with just a little room. (Many thanks to Zebo for demystifying OC'ing) I know that guide. I followed that guide. Here's what my settings are BIOS=1002 (my pci lock works as documented) FSB = 270 CPU Multipier = 9x HTT = 3x vCore = 1.50V DIMM = 2.85V Memory locked at 333Mhz CAS = 2.5 RAS to CAS = 3 Row Precharge = 3 Min RAS cycle = 6 So I guess that's 2.5-3-3-6 Sounds sort of like what everybody else is doing, and what I can't do. From this, I'd say you just don't have something right. I promise I have done everything people have told me, and I have understood it too. Assume that I am right. And that this happened to you. What would you do? What would you replace? Mobo? /David |
#23
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Actually, I am wondering how much software means. I am doing this on a
fresh Windows XP installation, so that shouldn't be the issue in itself. But when I boot on Knoppix (a live Linux distribution on cd), it seems I can push LDT/FSB a bit further before getting problems. But still not much. It stops then at 240 or so. And might still not be totally stable, I only booted and ran some intensive calculations and a memory stress test for 2-3 minutes. Still, it didn't croak (before I pushed it further). Is there a driver issue or something like that here? Is there some piece of crucial software or driver I have forgotten to install (Nvidia stuff, nTune, Athlon64 driver (yes it exists), Cool'n'Quiet etc.)? I also tried disabling all sorts of hardware on the motherboard (sound, SATA, USB, FireWire etc.). It didn't help. Assume I am an intelligent user, and that I have read up on most of what there is to say about A64 OCing, and that I have followed it all to the letter and even tried some other stuff and experimented, and I still don't get above 225 MHz. Imagine I am you And you experience this. What do you do? /David |
#24
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In article , David Rasmussen
wrote: Now, again, assuming that I have done anything right and there is no way to get above 225 MHz, which part of my system should I replace? If it was the CPU clock that couldn't go higher than 2000 MHz, I'd say: replace the CPU. If it was the RAM that couldn't go higher than 200 MHz, I'd say: replace the RAM. Now, when it's the LDT/FSB that can't go very far above it's stock 200 MHz, what do I replace? What part of the system is responsible for the LDT/FSB? The Mobo? The CPU? The RAM? /David Looks like it happens to other people also: http://www.xtremesystems.org/forums/...ad.php?t=52145 The FSB clock is a "processor internal" issue. Which says, if you didn't know anything else, you would conclude this is a processor issue. FSB * LDT multiplier = Hypertransport bus. Dropping LDT multiplier should make a crappy Hypertransport bus or a crappy motherboard chip work. Changing memory divider should correct for a processor memory controller that is not working well. Even some crappy RAM I had here, would eventually work if the frequency was dropped low enough. Memory parameters that might defy adjustment, would be things like setup and hold time, but then failing to meet those parameters would result in failure at any frequency (even 1 Hz). Logic dictates to replace the processor. Does the processor have a return policy ? You simply do not have enough evidence to make a call as to which _single_ component to replace. You can replace a whole bunch of stuff (like a guy doing work on a contract hardware support would do - change keyboard and mouse too :-)), but you'd lose our respect if you did that :-) Your decision is a time sensitive one, as if the retailer has a returns period or a returns policy, that may force the issue for you. You could return the motherboard before the return period has expired, for example. I doubt the processor has as generous a return policy as the other components (as people would abuse a generous return policy, to just search for good overclocking processors etc). I cannot help but feel you are missing something, like Vcore, Vdimm, etc adjustment. There are some motherboards that have obvious design flaws, and reproducible overclock limits caused by some architectural decisions. But there are some people out there who manage to get higher internal clock than you have managed. Any chance of testing the processor on another S939 motherboard ? Paul |
#25
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"David Rasmussen" wrote in message . .. Pete M Williams wrote: NOW, DAVID! A few questions that need answering. Can I ask what ratio's you have tried running your memory at? All ratios below the stock speed. And the stock speed of course. I will ask again. What ratio's did you try? Sorry but I do not think you have grasped this yet. You do know what the different DDR settings in the BIOS of the A8N represent with respect to dividers don't you? I'm not sure what you mean here. I understand the divider. I don't fully understand what "CAS Latency" is but I know where it and other similar settings should be set according to the manufacturer of my memory. I also tried a lot of different settings. Very conservative and slow settings. Experimenting with 1T and 2T etc. Didn't help. RAM setting (DDR266, DDR333, DDR400, DDR466, etc.) uses a ratio to take the FSB/HTT speed and multiply it by a fraction to set the RAM speed. Those settings are as follows: DDR 400 (PC3200 RAM):1/1 ratio DDR 333 (PC2700 RAM): 5/6 ratio DDR 266 (PC 2100 RAM): 2/3 ratio So if you are setting the BIOS to DDR 400 or and maybe Auto too you are running your RAM at 1:1 meaning that your "crappy" RAM is not able to keep up! With your RAM you will have to lower the setting to DDR 333 or lower or you will be overclocking the RAM by to much. |
#26
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Paul wrote:
I cannot help but feel you are missing something, like Vcore, Nope. Tried from 1.30V-1.55V and even more I think. Vdimm, Tried from 2.4V-2.9V. And again, I am not trying to overclock the RAM. etc adjustment. There are some motherboards that have obvious design flaws, and reproducible overclock limits caused by some architectural decisions. But there are some people out there who manage to get higher internal clock than you have managed. Most people, if not all, that have OCed with an ASUS A8N SLI Deluxe seem to get much higher LDT than me. Any chance of testing the processor on another S939 motherboard ? Hmm. Not easily. But of course it is a good suggestion to test every single component in another system. /David |
#27
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Pete M Williams wrote:
I will ask again. What ratio's did you try? Sorry but I do not think you have grasped this yet. Why do you think that? RAM setting (DDR266, DDR333, DDR400, DDR466, etc.) uses a ratio to take the FSB/HTT speed and multiply it by a fraction to set the RAM speed. I know. Have I said otherwise? Those settings are as follows: DDR 400 (PC3200 RAM):1/1 ratio DDR 333 (PC2700 RAM): 5/6 ratio DDR 266 (PC 2100 RAM): 2/3 ratio I know. So if you are setting the BIOS to DDR 400 or and maybe Auto too you are running your RAM at 1:1 meaning that your "crappy" RAM is not able to keep up! I know. With your RAM you will have to lower the setting to DDR 333 or lower or you will be overclocking the RAM by to much. I know. As stated: I have tried all possible ratios/dividers below stock speed. In other words, I tried DDR333 (5/6), DDR266 (2/3) and DDR200(1/2) and all other options below DDR400 (1/1), if any. Just to show you that I understand it (which you seem to doubt for some reason), I tried the following: LDT at, say, 240 (yeah, I tried that, but it is just an example) instead of 200 MHz. HT multiplier at 4 (HTT speed 4*240 MHz = 960 MHz instead of 1000 Mhz) CPU multiplier at 7 (speed: 7*240 MHz = 1680 MHz instead of 1800 MHz) RAM at DDR266 (2/3), so instead of running DDR400 (200 MHz), it runs 240*2/3 = 160 MHz. And, as I said, I verified all these numbers in CPUZ, ClockGen NF4 and similar programs. At least I am getting verified that my case is really an odd one. Otherwise, people wouldn't be so insistant in their "Are you sure you understand this? Are you sure you did it right?" etc. /David |
#28
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On Wed, 11 May 2005 19:28:14 +0200, David Rasmussen wrote:
don't get above 225 MHz. Imagine I am you And you experience this. What do you do? Well, I don't run windows for one thing.:-) But when I'm overclocking I always boot with a memtest cd and give it a good test before booting from the HD. Since you say you can get 240 running Knoppix, then maybe it's a driver problem in WXP. -- Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB) My server http://wesnewell.no-ip.com/cpu.php Verizon server http://mysite.verizon.net/res0exft/cpu.htm |
#29
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Wes Newell wrote:
Well, I don't run windows for one thing.:-) Heheh... Neither do I sometimes. But I want Windows to work on this particular machine. But when I'm overclocking I always boot with a memtest cd and give it a good test before booting from the HD. I did that too. Since you say you can get 240 running Knoppix, then maybe it's a driver problem in WXP. Maybe, but 240 isn't high either. Not high enough 9*240 MHz = 2160 MHz. Hardly impressive when everybody else is getting 2400 Mhz and similar. Also, the 240 Mhz wasn't entirely stable in Linux. What would you do in my case? Replace the CPU? /David |
#30
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On Wed, 11 May 2005 14:52:33 -0400, Paul wrote:
FSB * LDT multiplier = Hypertransport bus. Please refrain form using the defunct term LDT. That name/terminology (Lightining Data Transport) died with the new name of HyperTransport and I'm sure it's going to confuse the hell out of some people. There is no LDT bus in the A64 system. -- Abit KT7-Raid (KT133) Tbred B core CPU @2400MHz (24x100FSB) My server http://wesnewell.no-ip.com/cpu.php Verizon server http://mysite.verizon.net/res0exft/cpu.htm |
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