MoFoQ Posted December 13, 2004 Share Posted December 13, 2004 For some reason, when I use two sticks of 512MB DDR550 Corsairs (CMX512-4400C25) at the same time, it would fail memtest (1.30-1.40) on test #5 at anything about 225MHz FSB (DDR450) but it would be fine upto 260FSB (DDR520MHz) when it's only one at a time (I've tested each of the two slots with each of the two dimms). I've even reduced LDT and Hypertransport to 1x and 4x respectively (though it works fine even at 2x LDT and 9x Hypertransport) to make sure it's not the cpu. I've even upped the DDR voltage to 2.8v (the BIOS doesn't do 2.75v). I've also replaced the original el-cheapo passive chipset heatsink that was thermal-taped on with a bigger Coolermaster with Artic Silver 5 (and I added a small fan) (amazing it still fits). With both DIMMS in and at 226MHz FSB, I would get 4 errors per pass of test #5. 16 per pass for 227, 228 would get a few thousand, etc. At 225, I got none and I let it run for roughly two days (3192 successful passes of test#5). I need to RMA these anyways (the online store I got them from sent me the wrong ones and they won't respond to me; ordered black, got platinum). But before I drop by (I work in Fremont, just down the street from Corsair's offices), I want to know if there are anything else I can try to get it to pass at a higher FSB (or at least something closer to the specs; 275MHz) Thanks. BTW, the BIOS on the shuttle is the latest. It was one of the first things I tested. And the cpu is a sempron 3100+. The max total MHz I can get on that shuttle with this cpu is 2339 and still be stable in memtest (one stick). Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted December 13, 2004 Corsair Employees Share Posted December 13, 2004 The fact they will run one up at 260 MHz would suggest its not the memory. But I have no problem replacing the modules if you want to try that. But I would really suggest testing them in another system more suited for over clocking. Link to comment Share on other sites More sharing options...
MoFoQ Posted December 13, 2004 Author Share Posted December 13, 2004 I keep thinking it's the chipset (Nforce3) or a power issue (related to the extra power needed by the chipset and others for 260MHz FSB with two sticks). I know it's not the memory since I tested them individually and I tested them both in each slot to make sure it's not a slot related issue (bad connector in the DIMM slot, etc.). As soon as I get home, I'll see if the power is the issue (I have some spare 300W power supplies as well a 400w Antec.) Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted December 14, 2004 Corsair Employees Share Posted December 14, 2004 It could be, testing with a desktop PSU may help isolate that! Link to comment Share on other sites More sharing options...
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