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P5N32E SLI Plus won't boot with 4 sticks


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My MB is an ASUS P5N32E SLI Plus, and the ram I have is the CM2X1024-6400 (800MHz 5 5 5 12), 2 sets, so a total of 4 1GB sticks.


I recently decided to upgrade my ram from 2GB to 4GB and ran into a strange problem. Whenever I add the 4th stick, the computer hits the starts the boot screen but doesn't display anything past the bios revision, and hangs. I'm unable to entire bios, nor will it continue booting from that point. If switched the sticks and it doesn't seem to matter which stick is in there, it won't boot.


The system was perfectly stable at 2GB, and seems to be perfectly stable at 3GB (though it's been less than 24 hours since I installed it).


Am I stuck because I didn't buy the recommended RAM? Or is it more likely I have an MB with a bad memory slot?

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Minor update. Noted the version on the old sticks is 5.1, and the new is 7.3. Not sure if that makes a difference at all.


Also I swapped the positions of the old and new sticks and I couldn't even get it to post. Does this mean I got a bad set?

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You need to increase NB voltage and FSB Termination/CPU VTT Voltage.


1.40 for all 3 of them should do the trick. It is a problem with the 680i chipset.


I appreciate the reply. I did a little searching before posting and found someone suggested the following settings to fix the problem.


Memory Voltage: 2.0V

1.2V HT: 1.25V

NB Core Voltage: 1.4V

SB Core Voltage: 1.55V

CPU VTT Voltage: 1.25V



TCL: 5


TRP: 5

TRAS: 12

Command per Clock: 2

TRC: 24


So I've bumped the voltage a little bit already. Also the chipset is a 650i, not 680 - so as dumb as it sounds I'm not sure how high is safe to push the CPU VTT

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I would only add a little voltage to keep the system stable, but if its not stable then try setting the memory frequency at DDR667.


I put the voltage back at stock and dialed down the frequency and it booted up just fine. I'm not experienced with memory tweaking so there's no way I would have thought of that.


Thank you very much!

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