Buckster Posted November 7, 2006 Share Posted November 7, 2006 Corsair XMS6400 C5 RAM (P5B+ E6600) - it seems that they won't work properly if their b/w score is over 6500 in Sisoft for instance DDR800 CAS5 - Sisoft 6000 - stock CPU - fine - stable DDR740 CAS5 - Sisoft 6600 - CPU overclocked - unstable (RAM causing the instability) DDR800 CAS5 CPU@ 8x401=3.2 gig - Sisoft 6700 - unstable (RAM) DDR710 CAS4 - Sisoft 6400 - stable (even though RAM rated at only DDR600@CAS4) I don't remember reading anywhere when I bought the RAM that it would only work at 800 MHz @ a specific FSB. As FSB is increasing, bandwitdh between RAM and CPU and mobo is increasing, then RAM is falling over. So this presumably means that if say Intel bought out a 1200 fsb CPU next year, this RAM would not work at the rated 800 MHz ? So if my CPU is running at 8x400 = 3.2 gig, FSB = 1600, I know CPU can cope with the speed as I run it higher at 9x multiplier, I know motherboard can cope with the FSB, but RAM is not coping with the high FSB at DDR800 CAS5. RAM fails Memtest86. I'm not running the RAM out of spec am I - as only at DDR800 ? any ideas ? thanks, Mark. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 7, 2006 Corsair Employees Share Posted November 7, 2006 Please make sure that you have the latest bios version and then please Change ‘Write to Precharge delay’ in the BIOS (same page as for latencies) from default 10 to 15. And see if that will solve the problem and I would set the memory Voltage to 2.1 Volts as well. Link to comment Share on other sites More sharing options...
Buckster Posted November 7, 2006 Author Share Posted November 7, 2006 thanks very much for the prompt reply - will try that later. Certainly something I haven't tried. re VDimm though, anything above 2.05V is VERY unstable, according to a Corsair guy a while back on another forum, the PROMOS modules in my RAM have voltage regulators in them, and anything over 2.0V (maybe 2.05V) gets regulated ? True ? thanks, Mark. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 7, 2006 Corsair Employees Share Posted November 7, 2006 All of the modules IC usually have Voltage regulators on the IC's with few exceptions! So yes it true, but if setting the memory Voltage to 2.1 Volts causes errors it might suggest a Voltage problem with your MB and or PSU. I would suggest testing the modules one at a time in another system to be sure! Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.