smgepp Posted December 14, 2009 Share Posted December 14, 2009 When I install all four sticks of CMD8GX3M4A1600C8 Windows does not boot. Occaisionally it will BSOD but mostly it just hangs during boot. I can use any two of the sticks successfully in either pair of slots but not all four. I have attached CPU-Z screen shots for reference. The SPD screen is identical for all four sticks so I have only uploaded one. To even get two sticks to work I have had to explicitly set the FSB to 333MHz, the CPU multiplier to 8.5 and the memory speed to 1333MHz. VDIMM is set to 1.64v Can any body advise on what I have to do to make this work, please? Link to comment Share on other sites More sharing options...
Wired Posted December 14, 2009 Share Posted December 14, 2009 Sidenote: You'll have to OC your CPU's FSB to 1600 MHz to allow the memory to run @ 1600 MHz. Link to comment Share on other sites More sharing options...
smgepp Posted December 14, 2009 Author Share Posted December 14, 2009 Thanks Wired. I'm not trying to run it at 1600MHz. I'm trying to get it to work at the stock CPU speed so I've set the memory clock to 1333MHz. Since this is less than the rated speed for the memory I figured it should work easily - but something is wrong. Link to comment Share on other sites More sharing options...
smgepp Posted December 15, 2009 Author Share Posted December 15, 2009 I ran memtest for about 17 hours and it had one error (see attached). Is this enough to RMA? I was running with 2 sticks at the time. I'm running memtest on the other two sticks now. Link to comment Share on other sites More sharing options...
smgepp Posted December 17, 2009 Author Share Posted December 17, 2009 The second pair of sticks ran with memtest for over 21 hours with no errors. Does any one have any advice on what I can do to make this work at 1333MHz, please? Link to comment Share on other sites More sharing options...
Yellowbeard Posted December 17, 2009 Share Posted December 17, 2009 Since it is stable with 2 modules but not with 4, you likely need a bit of extra voltage on the memory controller. 1.35v - 1.45v range should do it. Link to comment Share on other sites More sharing options...
smgepp Posted December 17, 2009 Author Share Posted December 17, 2009 Since it is stable with 2 modules but not with 4, you likely need a bit of extra voltage on the memory controller. 1.35v - 1.45v range should do it. Thanks Yellowbeard. I have tried that. I stepped it up to 1.31, 1.35., 1.41. I didn't get as high as 1.45 though. I'll try that tonight when I get home. Is there anything else you can suggest if it still doesn't work? Link to comment Share on other sites More sharing options...
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