Fraggle99 Posted January 5, 2007 Share Posted January 5, 2007 Hello, I recently purchased two memory modules cmx512-4400c25pt from a local computer shop and I`m having trouble getting one of them to work properly. It only boots windows up to 230Mhz and won`t even post above that. Even when it boots at 230Mhz it fails Prime95 after 10s and dual channel operation is out of the question :o( The other module works flawlessly alone at 275Mhz. My timings are 2.5-4-4-8 command rate 2. Is it faulty? Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 6, 2007 Corsair Employee Share Posted January 6, 2007 what do you have the memory voltage set to? Should be 2.8 Volts. And what are you running the multiplier at? Link to comment Share on other sites More sharing options...
Fraggle99 Posted January 6, 2007 Author Share Posted January 6, 2007 I have tried 2.7v and 2.8v, I left the cpu multiplier at 10x and just varied the htt from 200-275Mhz with no divider. The cpu is proven at that speed. Thanks for replying. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 8, 2007 Corsair Employee Share Posted January 8, 2007 You will have to lower the CPU multiplier to 7 or 8 and set the HTT multiplier to 3 or 4 above 240 Mhz. Link to comment Share on other sites More sharing options...
Fraggle99 Posted January 9, 2007 Author Share Posted January 9, 2007 The HT multiplier is set to `200Mhz`, 1:1 in other words. Even with the cpu at 250x8 (well below stock) I get the same trouble but only with the one module. I`m fairly confident that the settings are good as one seems to work perfectly alone running p95 all night long at 275Mhz (275x12@1.6v, 275Mhz HT, 2.5-4-4-8, 2T). Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 9, 2007 Corsair Employee Share Posted January 9, 2007 You need to lower the HTT frequency! Link to comment Share on other sites More sharing options...
Fraggle99 Posted January 9, 2007 Author Share Posted January 9, 2007 Sorry for the confusion - the hyper-transport is already set to the lowest speed of 275Mhz, the same as ldt bus. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 10, 2007 Corsair Employee Share Posted January 10, 2007 The HTT frequency will not run at 275 Mhz you cannot go over 1000 Mhz with most MB's. Link to comment Share on other sites More sharing options...
Fraggle99 Posted January 13, 2007 Author Share Posted January 13, 2007 I don`t understand what you mean, the HT bus is not at anything like 1000Mhz, it`s 275Mhz, a setting of `200Mhz` in the bios. There are settings for 1,2,3,4 or 5x the ldt bus and it`s on 1x. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 13, 2007 Corsair Employee Share Posted January 13, 2007 The HTT multiplier would need to be set to 3 in order to run the FSB over 250 Mhz. The Max HTT freq should not be more the 1000-1100 Mhz depending on the specific CPU and chipset you have! Link to comment Share on other sites More sharing options...
Fraggle99 Posted January 18, 2007 Author Share Posted January 18, 2007 The ldt (or fsb) is set to 275Mhz, the ram is 1:1 so also 275Mhz and the Hypertransport is x1 as well so 275Mhz again. CPU-Z reads the Hypertransport speed as 275Mhz. Link to comment Share on other sites More sharing options...
Corsair Employee RAM GUY Posted January 18, 2007 Corsair Employee Share Posted January 18, 2007 Thats correct but there should be a HTT multiplier and the HTT Freq will always match the CPU Freq. but the total HTT Freq cannnot go over about 100 MHz max so the HTT multiplier needs to be lowered to O.C. the system. Link to comment Share on other sites More sharing options...
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