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Socket 754 Mobos and Dual Channel RAM


Markhawks

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Hello Gurus,

 

I have been battling a problem which is making me insane. I dedided to upgrade to an Athlon 64, so I grabbed the following:

Motherboard:

Gigabyte K8NS

Processor:

AMD Mobile Athlon 64 3000+ (DTR) ClawHammer

Memory:

CORSAIR XMS 1GB (2 x 512MB) 184-Pin DDR SDRAM Unbuffered DDR 400 (PC 3200) Dual Channel Kit

 

If I install both 512MB modules, the system falls back to 166 Mhz & crawls. If I remove one module, it jumps tp 200 Mhz where it belongs, and the system flies. Gigabyte has a FAQ on this, which supposedly was fixed a long time ago (http://www.gigabyte.com.tw/Motherboard/Support/FAQ/FAQ_473.htm), and I am at the latest BIOS now (F16).

 

The same thing happens on a different mobo, the ECS K8M800-M2 v1.0, which uses the VIA chipset. ECS suuport advises that I use "single bank DRAM" instead of "dual bank DRAM".

 

Is the problem due to the Socket 754 design? The Athlon 64 Mobile Architecture?

Any help is appreciated...

thanks

Mark

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This is the message:

 

Hey Wired,

I read with interest your post in this thread (http://www.houseofhelp.com/forums/showthread.php?t=42451) where you note that socket 754 is single channel only. I have been trying to make a pair of different Socket 754 mobo's work correctly with a CORSAIR XMS 1GB (2 x 512MB) 184-Pin DDR SDRAM Unbuffered DDR 400 (PC 3200) Dual Channel Kit (http://www.houseofhelp.com/forums/showthread.php?t=42903)

 

If I understand your post correctly, should I give up and swap out my dual channel memory for single channel? If so, what should I order?

thanks in advance,

Mark

 

Like I said in that other thread, there is no such thing as Dual Channel memory, as this is a property of the memory controller in how it handles memory. This is why you can place memory in different slot configurations on a motherboard and it will register as single or dual channel.

 

In other words, there is no such thing as single channel memory.

 

Now when Giga-Byte says single-bank vs. dual-bank, that's different from single channel and dual channel memory. I believe those sticks are dual-bank. However, reading the specs of both of those boards, they both can handle up to 1 GB modules per slot, which only come in dual-bank, so their "recommendation" is bogus either way.

 

What is the exact part # of your memory? It's a TwinX pack, correct?

How To Read the Memory Label

 

I'd test one stick at a time in each slot using Memtest86+.

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How many memory slots do you have and what slots do you have them in? I would suggest slots 1-3 or 2-3 if you have three slots.

 

Hi Ram Guy,

Thanks for the prompt response- you guys rock.

I have three slots, and they were in one and two. As you suggested, I tried both 1-3 and 2-3 and got the same result. Two sticks= 166 Mhz, one stick= 200 Mhz.

thanks,

Mark

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  • Corsair Employees
That is a limitation of this platform, but many of the systems we tested would run at DDR400 if the modules were in slots 1-3 or 2-3. You might check with the MB maker and see if there is newer bios and then after you update the bios load setup/optimized defaults and set the Dim over Voltage Control to +.2 Volts and see if that will solve the issue.
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Like I said in that other thread, there is no such thing as Dual Channel memory, as this is a property of the memory controller in how it handles memory. This is why you can place memory in different slot configurations on a motherboard and it will register as single or dual channel.

 

In other words, there is no such thing as single channel memory.

 

Now when Giga-Byte says single-bank vs. dual-bank, that's different from single channel and dual channel memory. I believe those sticks are dual-bank. However, reading the specs of both of those boards, they both can handle up to 1 GB modules per slot, which only come in dual-bank, so their "recommendation" is bogus either way.

 

What is the exact part # of your memory? It's a TwinX pack, correct?

How To Read the Memory Label

 

I'd test one stick at a time in each slot using Memtest86+.

 

Hi Wired,

Sorry if I did not understand the terminology- I am a network guy. DRAM terms are new to me.

Your suggestion of Memtest found a bad module- 2048 errors 50% of the way through the first pass. The other module passed four complete banks of tests without a hiccup.

 

Part# = CMX512-3200C2

Version = 1.5

XMS3202

Lot# 0525042

 

Next step?

thanks a ton- you guys are the best...

Mark

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We can try replacing the modules if you like, but this would suggest an issue with the MB if both modules run and pass http://www.memtest.org running one up.

 

Hey Ram Guy,

Thanks for the reply, and sorry if I was unclear. One stick of RAM is good (4 passes OK) while the other is bad (2048 errors on one pass). I have emailed NewEgg for an RMA. I will wait a reasonable amount of time and then ask you folks for an RMA.

thanks again

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