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MSI 975X Platinum Doesn't Play Well With 4GB TWINX Memory


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So here is a weird scenario. I just recently purchased an additional 2GB of TWIN2X2048-6400C4 memory for my machine. Prior to installation, my machine has been running at 3.15GHz (Core 2 Duo E6600 stock 2.4GHz) via 350MHz FSB. My memory was running at 667 with 2.1V and 4-4-4-12 settings. Everything was good in the world and my machine was stable.


After I installed the extra 2GBs of memory (my original memory is the same as listed above), my machine couldn't even get through the loading screen of Vista. I was quite unhappy, but figured since I had a bad pair of memory sticks before, maybe it happened again. Well, after testing it thoroughly, the memory was ok. So I got back in there and tried booting the machine up at the stock CPU speeds and let the memory setup via SPD. Lo and behold, the machine boots fine now.


So here is my question, why would an extra 2GBs of the same memory cause my machine to hang at settings it has ran perfectly fine with for months? Any suggestions on how to fix this? I've grown used to have the extra processor speed and not really sure I want to find out what life is like without it.

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Yes there is more loading on the system as you add more memory and especially when over clocking you will not have as much margin to over clock as you do with 2 modules installed.

I would suggest with all four installed go to BIOS setup and load setup defaults and then set the memory Voltage to 2.1 Volts and set the NB/MCH Voltage to +.05 Volts and set the memory frequency at DDR667 and leave the memory frequency linked to the CPU Frequency and see if it will pass http://www.memtest.org. If so then you can start to over clock the CPU slowly till you find the top end I would suspect it will get close to what what you had before but maybe top out at about 280-333 Mhz on the CPU and remember to lower the CPU Multiplier as you raise the CPU Frequency and you might have to add some voltage to the CPU. Now that being said I have just done something that I do not do as a rule in telling someone how to over clock. So you do realize that this is at your own risk Correct?

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