Problem with 2 mem cards

Hi! I have to identical ram cards: 2xcrucial ballistix 6400 1 gb ddr2. Each of them single (1gb) runns great, no errors, memtest ok on both. But when I run them together (2gb) I get blue screens, errors, crashes in windows and games. and memtest errors. I've tryed all slot combinations. Have 4 slots, 2 colors. I've tryed to reset bios. ram volt 2.1 as it says on the mem box. And i've deleted hdd and reinstalled xp, same problem. Why doesn't it work with 2 sticks when they are both running great alone?

Abit ni8 sli
p d 3.0 ghz
x1800xt
windows xp home sp2

How can I fix this? Thank you for helping me.

Try it at it's lowest settings like set it to 2T and set it to auto.

I've tryed all the slot combinations. Computer is unstable no matter how when I use 2 stics

It sounds like a timing problem but it might be a defective motherboard.

Do you have another DDR2 motherboard you can test the memory sticks in?

Maybe you can borrow one from a friend.

Are you certain the sticks are identical?

Are they DDR2-667?

Have you tried to manually set the timings in the BIOS to high values?

Try:

5-5-5-12

5-6-6-15

7-7-7-16

Also try running it at 667 and slower and see if it works.

Because we are trying to debug the problem.

It's possible there is a compatibility issue with this RAM on this board.

It's also possible your memory sticks may not be identical or may not be able to run at 800MHz DDR correctly.

Here's the RAM they have tested the board with:

http://www2.abit.com.tw/test_report/NI8%20SLI/


They did NOT test it with 800MHz DDR but they DID test 533, 667, 700 and 1000


Certain chipsets cannot run certain DIMMs at certain frequencies.

Which DIMM slots have you tried?

Hi! Thanx for the tips! I had alredy tryed sigle channel in dimm 1+2 But now I tryed in dimm 3+4... And it seems to work!!!! Mabye dimm 2 is faultuy? When I try 1+2 it just beeps and nothing comes up... I've only tryes counterstrike, but its working!!! Thanks!!!