alyandon Posted January 10, 2008 Share Posted January 10, 2008 I recently acquired a 2nd set of TWIN2X2048-6400 from Newegg (http://www.newegg.com/Product/Product.aspx?Item=N82E16820145590) to expand my system from 2GB to 4GB of memory in preparation of moving from Vista 32-bit to Vista 64-bit. My motherboard is a ASUS P5B Deluxe w/WiFi flashed to v1216 BIOS with an E6600 processor overclocked to 3.0ghz (fsb 333mhz). I'm using the default SPD configuration as read by the BIOS. After installing the 2nd pair of modules, I'm unable to run the memory at 4:5 ratio (~833 mhz) and have to set the memory to 1:1 ratio (~667 mhz) to run stably otherwise I get blue screens/instant reboots during Vista startup. I've tried upping the dimm voltage settings in the BIOS all the way up to 2.25V in an attempt to achieve stability but it seems that upping the voltage has absolutely no effect on stability as I still get blue screens/instant reboots during Vista startup. Any suggestions on how to get this memory running back somewhere close to it's rated speed? My real issue here is that the original pair of dimms in the system will overclock all the way up to ~1000 mhz @2.1V with the default SPD timings before I start seeing instabilty. Link to comment Share on other sites More sharing options...
alyandon Posted January 10, 2008 Author Share Posted January 10, 2008 Now that this thread has been moved to the proper forum I'd appreciate any suggestions/help you guys can come up with. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 10, 2008 Corsair Employees Share Posted January 10, 2008 With 4 modules DDR667 would be suggest, but you can try and increase the MCH/NB Voltage to +.05 Volts and see if it's stable with http://www.memtest.org. But if it's not I would set the frequency at DDR667. Link to comment Share on other sites More sharing options...
alyandon Posted January 10, 2008 Author Share Posted January 10, 2008 My short testing @667mhz with memtest86 showed no errors on the memory so for the moment I'm going to proceed with the assumption that there is nothing wrong with the dimms themselves. I'll will definitely run longer memtest86 sessions at various speeds this weekend to gather more data. On to your advice about the NB voltage. I'll try upping the NB voltage and report back. However, I'm curious... is there some known issue with the ASUS P5B & 965 chipset and having 4 banks occupied? Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 10, 2008 Corsair Employees Share Posted January 10, 2008 No issue just a limitation as you add more memory you will have to slow the memory down to access all of the memory when the system is fully loaded. Link to comment Share on other sites More sharing options...
alyandon Posted January 13, 2008 Author Share Posted January 13, 2008 The AMI BIOS for this board doesn't specify what the default voltage should be for the NB so I tried 1.45v and 1.55v respectively with the ram set back to 4:5 ratio (~833 mhz). Memtest detected errors within 10 minutes on both settings. Any other suggestions? Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted January 14, 2008 Corsair Employees Share Posted January 14, 2008 You can try it at Auto or DDR710 if you are not over clocking the CPU. Link to comment Share on other sites More sharing options...
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