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TWIN2x4096-6400C5 and D975XBX


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Several years ago I purchased my current system from ABS. It originally came with 2 GB RAM (CM2X1024-6400C4). In April I purchased 4 more GB in the form of TWIN2X4096-6400C5. My system ran great with the extra RAM until a couple of weeks ago. I noticed that lots of programs started crashing randomly and I even got several blue screens.


I ran several tests on my system. I started suspecting the RAM when memtest would only run for about 3 seconds and then freeze. Removing the new RAM and going back to just my original 2 GB resulted in memtest running fine and a stable system. Because of this, I assumed that the new RAM that I had purchased had gone bad somehow, so I reported the problem, got an RMA, returned the RAM, and got a replacement set.


With the replacement RAM in place, the problem still persists unfortunately - so I guess the problem wasn't with the RAM afterall. Any ideas what else it might be?


Here are some more results with various combinations:


1. 1 stick of cm2x1024-6400c4 = stable system and memtest

2. 2 sticks of cm2x1024-6400c4 = stable system and memtest

3. 1 stick of cm2x2048-6400c5 = stable system and memtest

4. 2 sticks of cm2x2048-6400c5 = memtest reboots system and unstable windows

5. all 4 sticks = memtest freezes after 3 seconds and unstable windows


So it looks like my system can use 2 sticks of 1 GB or 1 stick of 2 GB - for a total of 2 GB in both cases, but going to 4 GB or 6 GB causes problems. The odd thing is that it was working fine for several months and now it's not.


Any ideas what it might be?

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* Four 240-pin DDR2 SDRAM Dual Inline Memory Module (DIMM) sockets

* Support for 667 and 533 MHz DDR2 DIMMs

* Support for up to 8 GB of system memory

* Support for ECC and non-ECC memory


although the 800 ram worked, Intel claims its not supported?


can you try setting them at 667 or 533 and see if it helps? also check the voltage! you also may need to up the NB voltage being you have several slots occupied.

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