e38826 Posted November 9, 2007 Share Posted November 9, 2007 My specs are: Intel Q6600@2.4ghz Cosair Nautilus 500 Water Cooling 2gig pc8500 sli ready c5 rev 1.3 cosair 5-5-5-15 DDR 1066 2gig pc8500 sli ready c5 rev 2.1 cosair 5-5-5-15 DDR 1066 EVGA 680i motherboard revision ar BFG 8800gtx 768meg Soundblaster X-Fi Ageia 128meg Physx Card raptor 150gig HD western digital 400gig hd My problem: My system was running fine with no problem until I installed the 2.1 version of the pc8500. At first the motherboard would not detect the memory as sli ready. It booted and ran fine for a hour or then I rebooted and it would not go back into Vista or XP. I played with the settings and finally got back in, but now the system keeps crashing. Even took out the new twin pair and nothing. Then only way I have been able to run with some stability is with the memory set to 800mhz intead of the specified 1066. Please advise. My memory is now considerably slower. Link to comment Share on other sites More sharing options...
Wired Posted November 9, 2007 Share Posted November 9, 2007 1. your posted system specs are different from what are in your profile. Please clarify. 2. What is the PART NUMBER of your memory? How To Read the Memory Label 3. Running 4 sticks, let alone 2 pairs w/ different ICs, will very well limit you to a lower memory speed. Link to comment Share on other sites More sharing options...
DerekT Posted November 9, 2007 Share Posted November 9, 2007 3. Running 4 sticks, let alone 2 pairs w/ different ICs, will very well limit you to a lower memory speed. ^^Fully Agree^^ The memory controller can not keep up with the extra DRAM at the rated 8500 speed. You will need to drop the speed of the DRAM from 1066Mhz to 800Mhz. If you had purchased 4 X 1024MB of PC6400 (800Mhz) DRAM, then you would have had to drop to PC5300 (667MHz) DRAM, etc. 2 X 2048 will not issue this problem. This is a problem of all 4 banks being populated. Think of it this way. If you have a small phone book, then when you go into the index to find the page where you will find the phone number you are doing so at a certain speed due to the pages of the Index. Then you have to drive through the pages to get to the number. Now if your index is twice as large and the pages twice as many, then it takes longer to access the data. Now DRAM has a Strobe and the length of the strobe is how long the rows and columns can be left open before they must be refreshed. There is not enough time for the dram to be refreshed and then accessed with 4GB at the full access speed of the DRAM. The chipsets are optimized for 2GB, not 4GB and for 2 DRAM slots, not 4 DRAM slots populated. You can overclock the FSB (and hence the Memory Controller Hub = MCH) to gain some extra bandwidth and thus access the capabilities of the DRAM since the chipset is now clocked up. Usually when you clock up the FSB and concurrently the Memory Controller Hub (MCH) you need to raise the voltages of the CPU/MCH a bit as well. Link to comment Share on other sites More sharing options...
Corsair Employees RAM GUY Posted November 9, 2007 Corsair Employees Share Posted November 9, 2007 My specs are: Intel Q6600@2.4ghz Cosair Nautilus 500 Water Cooling 2gig pc8500 sli ready c5 rev 1.3 cosair 5-5-5-15 DDR 1066 2gig pc8500 sli ready c5 rev 2.1 cosair 5-5-5-15 DDR 1066 EVGA 680i motherboard revision ar BFG 8800gtx 768meg Soundblaster X-Fi Ageia 128meg Physx Card raptor 150gig HD western digital 400gig hd My problem: My system was running fine with no problem until I installed the 2.1 version of the pc8500. At first the motherboard would not detect the memory as sli ready. It booted and ran fine for a hour or then I rebooted and it would not go back into Vista or XP. I played with the settings and finally got back in, but now the system keeps crashing. Even took out the new twin pair and nothing. Then only way I have been able to run with some stability is with the memory set to 800mhz intead of the specified 1066. Please advise. My memory is now considerably slower. I would suggest you conact EVGA for a new version of your MOBO. The AR versions are not as solid with the Quad core CPUs and EVGA offers a free upgrade to the A-1 version which should provide a great deal more stability when OCing with a Quad core CPU. Additionally, when you are setting the memory settings on this board, you will need to increase both the CPU FSB voltage to 1.4v and SPPv to 1.4v to accomodate the extra load of 4 modules on the memory controller. Link to comment Share on other sites More sharing options...
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