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...
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