Hi,

I have 2 Athlon 1800XP systems with AOPEN nforce2 boards running (133MHZ/DDR266) since 2 years.

Some days ago one system showed some inexplicably errors.

I shifted the 2 RAM modules in this PC and the BIOS beeped memory error.

So I performed a memtest86 run on both PCs:

The results are alarming.

I have used the following ram modules:

1) 2 Infineon DDR266 256MB

2) 1 HP DDR333 512MB + 1 Infineon DDR400 256MB

I got all ram modules to show some error depending on slot position and test time!!!

Only when reducing to FSB100=DDR200 , 2 of them show no errors in memory slot1, the other still show errors after hours of running.

How can I find out which ram modules are OK or how can I test the boards?

Edited September 25, 200619 yr by muchlux

Test one at a time.

http://www.memtest.org/ for testing ram

remember set ram by speed ....

it is known ddr ram cannot use unsame speed ram together and different brand also can cause problem because using different ram chipset.....

@cyberloner

does this mean that I cannot mix DDR266 and DDR400 modules?

But now only DDR400 modules are available on the market.

Should I use same FSB for CPU and RAM?

Is somebody familiar with memtest? How can I determine the defective chip on the module?

dun mix ... it is not sdram anymore... and if u want ... u need both same chipset ram to mix.....

u may try to mix but both need running ddr266.... but not recommended...error will comes out....

one more things... if u buy 2 ddr400 u can run dual ddr mode means more faster ram access than using single ram....

memtest run it and make a floppy disk...restart and boot from floppy....

it will boot from a: drive

and run test it own...

if red error comes out means bad ram chips.....

Never I had problems mixing slower RAM with faster, just make sure it´s manual set at the speed of the lowest speed RAM, or place the the module with the lowest RAM first.

The only thing I could think of is the chipsize and chipcount or the voltage taht could mess up things.

And it´s DDR-SDRAM by the way , so it´s still SDRAM.

[snipped] And it´s DDR-SDRAM by the way , so it´s still SDRAM.

DDR = double data rate

nitroshift, are you saying that to me?

Seems to be a temperature problem.

After 1 hour of running all memory locations have error and then the PC freezes until I let cool down for 30 minutes.

the northbridge has only standard passive heatsink and gets very hot also CPU and memory is hot.

I am not able to select FSB slower than 133(only faster) in BIOS - how can I do this? (newest BIOS R1.16).

Aopen AK79D400VN with 1800XP-Palomino.

nitroshift, are you saying that to me?

Yep ... Just joking. I told everyone.