Rattrap Posted January 19, 2006 Share Posted January 19, 2006 I have 2 CMX512-3200C2PRO's. When run individually each chip seems to run fine and runs at 400 mHz (200 FSB). If I install both in dual channel mode, they drop down to 200 mHz (100 FSB). It does this in mutliple systems and if I install different PC3200 ram in those systems, they do run correctly at 400 mHz. They were not sold as a 2 pack, they were bought seperate. The only visible difference is that on the label says XMS3202v1.1 and the other XMS3202v2.1 other than that they seem to be identical (except for another series of number which I believe to be the serial number). Is there are reason this would happen, even though they should be the same chips with the same timings? 1 Motherboard was a MSI Diamond Pro with an AMD Athlon64 4400+ x2, the other test board was a Gigabyte GA-K8N51GMF-9 with a AMD Athlon64 3500+ Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 19, 2006 Corsair Employee Share Posted January 19, 2006 If they both run at DDR400 one up that would suggest some other problem. Are you using the same CPU and PSU when you tested with the other MB? Link to comment Share on other sites More sharing options...
Rattrap Posted January 20, 2006 Author Share Posted January 20, 2006 No, these are 2 entirely different computers with entirely different hardware. I just tested the ram in the other machine. Single chip, Runs at 200 mHz FSB (400 DDR), but with both in drops to 100 mHz FSB (200 DDR). It is one of the strangest things I have ever seen. The CMOS of both machines shows that the FSB for the ram should be at 200, but they both report DDR 200 speeds on bootup and in various Windows Applications: nVidia nTune, SiSoftware Sandra. I tried using a couple of CMX512-3200PTs I had, and these do come up at DDR 400 on both machines, so it doesn't look like it is an actual problem with the computers' hardware itself, since the behavior is consistant between the 2 machines. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 21, 2006 Corsair Employee Share Posted January 21, 2006 I would try and manually configure your bios to Cas 2.5-3-3-7 at 2.7 Volts at DDR400 and then test with http://www.memtest.org. Link to comment Share on other sites More sharing options...
Rattrap Posted January 23, 2006 Author Share Posted January 23, 2006 Relaxing the timings did seem to help. They did begin to operate at their proper speeds again. Haven't run memtest yet, but the computer seems to be stable so far. Why should I have to relax the timings on these to get them to operate at the speeds they should be? Link to comment Share on other sites More sharing options...
Wired Posted January 23, 2006 Share Posted January 23, 2006 It's never recommend to mix memory of different revisions. Link to comment Share on other sites More sharing options...
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