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#1
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Denied! Computer RAM does not DO Dual Channel MODE
I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400)
into my system, when up flashes, the ominous words, "Single Channel Mode." OK, I thought. I wont panic yet. I looked at my motherboard spec and saw that I didnt have the DIMMs in the right order. Ive got 4 slots, A0 A1 B0 B1. Initially I tried A0 A1 and that didnt work. So I tried A0 B0 and ... "SINGLE CHANNEL MODE." ARGGGGGGGGGGGGHHHHHHHH! Now I want to take hostages! ------------------------------------------------------------------ Here's my setup: ------------------------------------------------------------------ - Intel Motherboard: D865GBF (socket 478) - P4 2.8 ghz (with hyperthreading) 800 FSB - RAM (512 MB x 2) 1rst stick -- Crucial CT6464Z40B.16FG (32MB x 8)/(32 x 8) 16 SDRAM Chips 2nd Stick -- Crucial CT6464z40B.8TDY (64MB x 8) 8 SDRAM Chips ** 4GB RAM Max allowed on Motherboard - Windows XP Pro with SP2 ------------------------------------------------------------------ Here's what my motherboard spec has to say about DIMMs and Channels. ************************************************** ************************** Examples of Dual Channel Configuration with Dynamic Mode Throughput Highest to Lowest ************************************************** ************************** Dual Channel with Dynamic Mode --- All DIMMs matched Dual Channel without Dynamic Mode --- DIMMs matched from Channel A to Channel B Dual Channel without Dynamic Mode --- DIMMs not matched within channels Single Channel with Dynamic Mode --- Single DIMM or DIMMs matched within a channel Single Channel without Dynamic Mode --- DIMMs not matched ************************************************** ************************* Basically Im getting that my Memory Sticks are not matched. Is it because Ive got 8 Chips on one Stick and 16 Chips on the other? Its the same basic model or at least I thought. Now Im not sure what to do. Ive got a brand new stick that doesnt do dual channel mode which is why I bought it originally. Doing a return is costly and timely. Ive contemplated bartering with local computer shops to see if they could give me a deal. Ive also thought about selling one of the sticks or both and just buying another "matched pair" outright. Any ideas? Teknowbabble |
#2
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Denied! Computer RAM does not DO Dual Channel MODE
Teknowbabble wrote:
I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." Any ideas? Match pairs - or at least two stick as to each other as possible But I would always choose match pairs above single sticks - Peter -- Hi! I'm a .signature *virus*! Copy me into your ~/.signature to help me spread! |
#3
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Denied! Computer RAM does not DO Dual Channel MODE
Peter Lykkegaard wrote:
Teknowbabble wrote: I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." Any ideas? Match pairs - or at least two stick as to each other as possible But I would always choose match pairs above single sticks - Peter Yup, must be identical pairs (same exact timings) and often best if the factory also certified them as a "matched dual-channel set". Place them into the same colored slots, usually 1+3 and 2+4. But don't worry adout it too much, in the real world dual channel really doesn't make that much of a diff, most apps are nowhere near mem-bandwidth strapped. If you have a raid disk setup it might help there tho... [still only talking a few % points improvement]. |
#4
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Denied! Computer RAM does not DO Dual Channel MODE
On 9 Mar 2007 05:27:45 -0800, "Teknowbabble"
wrote: I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." OK, I thought. I wont panic yet. I looked at my motherboard spec and saw that I didnt have the DIMMs in the right order. Ive got 4 slots, A0 A1 B0 B1. Initially I tried A0 A1 and that didnt work. So I tried A0 B0 and ... "SINGLE CHANNEL MODE." Right on matched pairs. Dual channel mobos generally default to single channel operation if the pairs are not matched. So your mobo is behaving as it should. "Dual Channel without Dynamic Mode --- DIMMs not matched within channels" I think this is the case you were hoping would work. I think----THINK-- this refers to matching density and not necessarily module capacity. This is assumes density is defined as the capacity of each dram unit (chip) as opposed to total module capacity. A recent conversation with Crucial suggests this. Open to correction.... Dave H |
#5
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Denied! Computer RAM does not DO Dual Channel MODE
"Teknowbabble" wrote in message oups.com... I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." OK, I thought. I wont panic yet. Now Im not sure what to do. Ive got a brand new stick that doesnt do dual channel mode which is why I bought it originally. Doing a return is costly and timely. Ive contemplated bartering with local computer shops to see if they could give me a deal. Ive also thought about selling one of the sticks or both and just buying another "matched pair" outright. I was under the impression, borne out by personal experience, that dual channel working usually requires two matched memory chips. Most of the big memory mfrs sell matched pairs, for dual channel working. I use Corsair's TwinX brand.. P. |
#6
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Denied! Computer RAM does not DO Dual Channel MODE
I was under the impression, borne out by personal experience, that dual channel working usually requires two matched memory chips. Most of the big memory mfrs sell matched pairs, for dual channel working. I use Corsair's TwinX brand.. P. No, and it's dangerous to spread that rumor. Dual channel requires two RAM boards with similar specifications, but not necessarily the same model, or even the same brand. HOWEVER, that didn't stop unscrupulous memory manufacturers from trying to profit underhandedly from the dual channel feature. What I've seen quite often is, brand X will package two of memory stick Y and set price Z (cost of 2Y), using "dual channel kit" as a flimsy excuse for price gouging. That is, 1GB (one stick) is $100 (for example) Dual channel kit of 2 X 1GB is $230 (for example) If you buy the (one) dual channel kit you get EXACTLY what you'd get if you bought (two) of the 1GB sticks. So as you can see, the math doesn't compute. There is nothing special about RAM that is used in dual channel mode. It is RAM. The chipset uses two RAM sticks as one really wide stick, to slightly increase bandwidth/memory performance. The RAM is identical, whether you install one stick or two, and whether you purchase single sticks or a dual channel "kit". But if you bought the dual channel kit, you might possibly have paid too much. -Dave |
#7
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Denied! Computer RAM does not DO Dual Channel MODE
Teknowbabble wrote:
I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." OK, I thought. I wont panic yet. I looked at my motherboard spec and saw that I didnt have the DIMMs in the right order. Ive got 4 slots, A0 A1 B0 B1. Initially I tried A0 A1 and that didnt work. So I tried A0 B0 and ... "SINGLE CHANNEL MODE." ARGGGGGGGGGGGGHHHHHHHH! Now I want to take hostages! ------------------------------------------------------------------ Here's my setup: ------------------------------------------------------------------ - Intel Motherboard: D865GBF (socket 478) - P4 2.8 ghz (with hyperthreading) 800 FSB - RAM (512 MB x 2) 1rst stick -- Crucial CT6464Z40B.16FG (32MB x 8)/(32 x 8) 16 SDRAM Chips 2nd Stick -- Crucial CT6464z40B.8TDY (64MB x 8) 8 SDRAM Chips ** 4GB RAM Max allowed on Motherboard - Windows XP Pro with SP2 ------------------------------------------------------------------ Here's what my motherboard spec has to say about DIMMs and Channels. ************************************************** ************************** Examples of Dual Channel Configuration with Dynamic Mode Throughput Highest to Lowest ************************************************** ************************** Dual Channel with Dynamic Mode --- All DIMMs matched Dual Channel without Dynamic Mode --- DIMMs matched from Channel A to Channel B Dual Channel without Dynamic Mode --- DIMMs not matched within channels Single Channel with Dynamic Mode --- Single DIMM or DIMMs matched within a channel Single Channel without Dynamic Mode --- DIMMs not matched ************************************************** ************************* Basically Im getting that my Memory Sticks are not matched. Is it because Ive got 8 Chips on one Stick and 16 Chips on the other? Its the same basic model or at least I thought. Now Im not sure what to do. Ive got a brand new stick that doesnt do dual channel mode which is why I bought it originally. Doing a return is costly and timely. Ive contemplated bartering with local computer shops to see if they could give me a deal. Ive also thought about selling one of the sticks or both and just buying another "matched pair" outright. Any ideas? Teknowbabble The evidence they are not matched, is right there in the "16FG" and the "8TDY" of the part numbers. The first DIMM has 16 chips and the second DIMM has 8 chips. The first DIMM is made with 32Mx8 chips and the second DIMM is made with 64Mx8 chips. It looks like the pricing at the component level, must now favor using the larger memory chips (because I saw mention of an 8 chip Crucial 512MB stick a couple days ago). A while back, there were a couple 512MB single sided DIMMs, but they seemed to disappear (probably because they cost more and weren't competitive). Up to this point, 512MB sticks were more or less uniformly 16 chip designs, with 32Mx8 chips. But now that Crucial is shipping that kind of stuff, we'll have to warn people of the possibility of the mixing of the two kinds of stock. I hope this doesn't become a popular trend with the manufacturers. (Not that I think an 8 chip DIMM is bad - it should be better for overclocking :-) ) Paul |
#8
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Denied! Computer RAM does not DO Dual Channel MODE
To insure dual channel mode you SHOULD buy a MATCHED set of 2 RAM sticks RAM
from a vendor. They sell them that way specifically because dual channel mode requires two ABSOLUTELY IDENTICAL RAM sticks in order to work stabley. -- _________ DaveW "Teknowbabble" wrote in message oups.com... I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." OK, I thought. I wont panic yet. I looked at my motherboard spec and saw that I didnt have the DIMMs in the right order. Ive got 4 slots, A0 A1 B0 B1. Initially I tried A0 A1 and that didnt work. So I tried A0 B0 and ... "SINGLE CHANNEL MODE." ARGGGGGGGGGGGGHHHHHHHH! Now I want to take hostages! ------------------------------------------------------------------ Here's my setup: ------------------------------------------------------------------ - Intel Motherboard: D865GBF (socket 478) - P4 2.8 ghz (with hyperthreading) 800 FSB - RAM (512 MB x 2) 1rst stick -- Crucial CT6464Z40B.16FG (32MB x 8)/(32 x 8) 16 SDRAM Chips 2nd Stick -- Crucial CT6464z40B.8TDY (64MB x 8) 8 SDRAM Chips ** 4GB RAM Max allowed on Motherboard - Windows XP Pro with SP2 ------------------------------------------------------------------ Here's what my motherboard spec has to say about DIMMs and Channels. ************************************************** ************************** Examples of Dual Channel Configuration with Dynamic Mode Throughput Highest to Lowest ************************************************** ************************** Dual Channel with Dynamic Mode --- All DIMMs matched Dual Channel without Dynamic Mode --- DIMMs matched from Channel A to Channel B Dual Channel without Dynamic Mode --- DIMMs not matched within channels Single Channel with Dynamic Mode --- Single DIMM or DIMMs matched within a channel Single Channel without Dynamic Mode --- DIMMs not matched ************************************************** ************************* Basically Im getting that my Memory Sticks are not matched. Is it because Ive got 8 Chips on one Stick and 16 Chips on the other? Its the same basic model or at least I thought. Now Im not sure what to do. Ive got a brand new stick that doesnt do dual channel mode which is why I bought it originally. Doing a return is costly and timely. Ive contemplated bartering with local computer shops to see if they could give me a deal. Ive also thought about selling one of the sticks or both and just buying another "matched pair" outright. Any ideas? Teknowbabble |
#9
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Denied! Computer RAM does not DO Dual Channel MODE
"DaveW" wrote in message . .. To insure dual channel mode you SHOULD buy a MATCHED set of 2 RAM sticks RAM from a vendor. They sell them that way specifically because dual channel mode requires two ABSOLUTELY IDENTICAL RAM sticks in order to work stabley. Well, that's the vicious rumor that people insist on spreading anyway |
#10
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Denied! Computer RAM does not DO Dual Channel MODE
Teknowbabble,
Do you know the speed rating of your first RAM? Google CPU-Z and run it. If the orignal RAM and your new RAM have the same speed rating, double channel should work... -fly- On Mar 9, 7:27 am, "Teknowbabble" wrote: I just stuck in my neeeewww stick of Crucial 512 MB PC3200 (DDR400) into my system, when up flashes, the ominous words, "Single Channel Mode." OK, I thought. I wont panic yet. I looked at my motherboard spec and saw that I didnt have the DIMMs in the right order. Ive got 4 slots, A0 A1 B0 B1. Initially I tried A0 A1 and that didnt work. So I tried A0 B0 and ... "SINGLE CHANNEL MODE." ARGGGGGGGGGGGGHHHHHHHH! Now I want to take hostages! ------------------------------------------------------------------ Here's my setup: ------------------------------------------------------------------ - Intel Motherboard: D865GBF (socket 478) - P4 2.8 ghz (with hyperthreading) 800 FSB - RAM (512 MB x 2) 1rst stick -- Crucial CT6464Z40B.16FG (32MB x 8)/(32 x 8) 16 SDRAM Chips 2nd Stick -- Crucial CT6464z40B.8TDY (64MB x 8) 8 SDRAM Chips ** 4GB RAM Max allowed on Motherboard - Windows XP Pro with SP2 ------------------------------------------------------------------ Here's what my motherboard spec has to say about DIMMs and Channels. ************************************************** ************************** Examples of Dual Channel Configuration with Dynamic Mode Throughput Highest to Lowest ************************************************** ************************** Dual Channel with Dynamic Mode --- All DIMMs matched Dual Channel without Dynamic Mode --- DIMMs matched from Channel A to Channel B Dual Channel without Dynamic Mode --- DIMMs not matched within channels Single Channel with Dynamic Mode --- Single DIMM or DIMMs matched within a channel Single Channel without Dynamic Mode --- DIMMs not matched ************************************************** ************************* Basically Im getting that my Memory Sticks are not matched. Is it because Ive got 8 Chips on one Stick and 16 Chips on the other? Its the same basic model or at least I thought. Now Im not sure what to do. Ive got a brand new stick that doesnt do dual channel mode which is why I bought it originally. Doing a return is costly and timely. Ive contemplated bartering with local computer shops to see if they could give me a deal. Ive also thought about selling one of the sticks or both and just buying another "matched pair" outright. Any ideas? Teknowbabble |
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