Hi My motherboard has 2 DDR ram slots. It can take up to 1G in each. At present I have 2, identical, but not matched 512M DDR sticks. If I run memory test with either stick in either slot no problems. If I run both sticks together (1G) total the memory test eventually fails, after about 10 minutes. I'm starting to think its a 3.3v PSU problem. Anybody got any ideas.

Which memory test program are you using? Are you sure both sticks are identical? Did you manually configure the RAM settings in the BIOS or are you just accepting the defaults?

Hi I'm using the windows Usoft one. I found it on the Web and its down loaded onto a floppy which you insert prior to boot up. It looks OK and picks up the memory size. It does comprehensive tests. I have not touched the BIOS didn't know it involved memory. Both sticks are corsair 512M 3200. Regards

"Both sticks are corsair 512M 3200" Both have the same timings & voltage requirements? Verify that the BIOS is detecting them correctly. Try memtest86, memtest86+ or Windows Memory Diagnostic.

Hi Its windows diags which is picking up the ram errors. Ive rechecked my ram. Both sticks are 512M 3200. One is a VS512MB400, and the other is VS 512MB400C3. There is a difference in the latency but would this cause failure when the sticks are working together. Als noted on other posts that there is a question about using a graphics card. Well I do but the PSU is rated at 400W so this should not be a problem. Any ideas.

A bit more on my DDR problrm. The CPU is an AMD 2800 DKV4D. This is quoted as having a FSB as 333MHZ. The board has a clock switch. On = 100/200, Off = 166/333. Mine is set to off. The DDRs are 400. I have always believed that this is just the upper speed that they can handle. It will not care that the board supplies data at 166MH. (166 x 2 = 333). Any comments.

The DKV4D CPU runs at 166MHz frequency (aka 333MHz FSB). The RAM should run at the same speed even though it's rated to run higher. Go into the BIOS, change the RAM setting from AUTO to Manual, then configure the RAM to run at 166MHz (DDR333). Manually set the timing to 2.5-3-3-11 & set the RAM voltage to ?? (2.5v, 2.6v, 2.7v). I don't know which voltage your RAM is supposed to run at...either check the label or the Corsair website.