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Problem with Dual Channel and 400Mhz VS512MB400 x 2


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:[pouts: For me is imposible to run my system with 512MB x 2 (1 Gb) (Corsair Value Select PC3200 512MB x 2) memory modules IN DUAL CHANNEL and memory in 400 Mhz at the same time. The only way that my system work with dual channel and both modules ok is manually changing memory bus to 333 (Memory Speed: 83% of FSB) I tested single modules one by one in 400 Mhz and everything fine. I use the recommended bios configuration that Corsair sent to me (2.5-3-3-8) with Dimm 2.7 Volts and nothing (same problem in dual channel and 400).


With Dual Channel and DDR400 the systems becomes unstable, memtest86 show me a lot of errors and 3D games like Battlefield 2 restart my computer in the middle of the game. I tested my Corsair modules in other computer with no problems. All problems disapears when using only one module or using 333 Mhz mem speed... but I like to run my memory at the same speed of my FSB!! (cpu and mem sync!) :mad:


Please Help! :(:



Gigabyte GA-7N400 Pro2 (Rev 2.0) & (FK Bios Version)


Athlon Xp 3200 (FSB 400)


VS512MB400 (x2 = 1GB Dual Channel) :sigh!:

Video Card:


Hard Drive # 1:

Maxtor 80GB 7200 ATA133

Hard Drive # 2:

Seagate 60GB 7200 ATA100

Optical Drive # 1:

Sony DVD Burner

Power Supply:

Antec True Power 430W

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I have a very similar problem to what you describe.


I have a set of Corsair TWINX-3200C2 (2x512Mb) memory and when I went to use them in my motherboard (Abit Kn8 Ultra with A64 X2 4200) I had issues.


Either stick could be used on it's own but not together.

When used together the m/b ran in dual channel mode and I had to set the DRAM command rate to 2T instead of 1T to get stability.


Everything else I tried was not stable.


I am hopefull that there will be a BIOS revision that might help.

Perhaps that is something you can check for as well.




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I Have the same problem with my Asus A7N8X-E Deluxe and Athlon 3200+.

Ive read its the processor. Im not sure if this is correct or not.


I had Another brand of ram which I ran in Dual Channel mode and it was fine. Then it randomly BSOD'd on me.


This is why i thought it was the motherboard. Now im leaning more towards the processor because you have the same processor as me.


Asus are not going to make a new Bios Revision, im fairly sure. The board is old :/

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  • Corsair Employees

Please try these settings:

With the A7N8X-E please set the FSB jumper to pins 2-3 with the modules in slots 2-3 and then reset or clear the bios and load setup defaults and set the Dim Voltage to 2.7 Volts and set the timings manually. Then please test the system with http://www.memtest.org.

CPU Freq: 200 MHz

Memory Frequency: 100%

Dim Voltage to 2.7 Volts

Resulting Frequency: 200 MHz

SDRAM CAS Latency: 2.5T

SDRAM RAS to CAS Delay (tRCD): 3T

SDRAM Row Precharge (tRP): 3T

SDRAM Active to Precharge Delay (tRAS): 6T


I have had 4 of these exact MB's and this is what had to be done to solve problems with aggressive memory, no matters who's I tested. In addition, a few other's had some success disabling Spread Spectrum in the bios as well. I would take a look at http://www.asusforums.org as well in the AMD section.

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