Memory Upgrade Problem

[reggy29]

Hi All, System spec is GA-P35-S3 (rev 1) MB, E6750 CPU
. Memory - Corsair CM2X1024 - 6400C4 800Mhz 4-4-4-12 2.1v. I just upgraded the Video card and since memory is so cheap I got another 2Gb Memory kit exact spec as current. After installing system won't boot up. The memory is not faulty as a have swapped around in slots but can't get system to boot with more than 2Gb installed. Do I need to go into the Bios and make some changes? And if so what do I need to do. O/S is Win XP 32bit.
Any help is appreciated.. :??:

 

[BillParrish]

Strategy is to give the MCH some more voltage so it can drive the additional load from the new memory and to let the board rediscover the memory timings are that automatically set during post.

make sure you have the latest bios. (if you do need to update your bios make double damn sure you get the right file, as you mentioned you have a rev1 board I think you are aware of the different revisions etc. just a reminder - its easy to get the wrong one if you are in a hurry.)

Boot with 2 sticks and go into the bios and load factory defaults and reboot with 2 sticks.
Hit Control-F1 at main bios screen to make sure we can see all bios options.
In the MIT menu set all memory settings to auto/SPD
Make sure you are at stock FSB.
Make sure the memory multiplier is NOT auto and set it to 2.0
Make sure memory performance enhance is Normal.
Set vdimm (memory voltage) to 2.0 (2.1V is too high)
Set mch voltage to +.1

save and exit and kill the power stick in your other 2 sticks and see if it will boot. Let it try at least 3 times if it goes into its automatic rebooting sequence, its trying to readjust settings.

If it will not POST, power off, remove 2 sticks, go back into bios, check settings above (especially the memory multiplier as it likes to default to auto and should be 2 ) and change the MCH voltage to +.2 save and exit, power down install the other 2 sticks and try again. It also may help to give the FSB voltage one to two "bumps" up in voltage.

It is very sad that the P965 and P35 boards where optimized for 2 sticks of ram. In going to 4 x 1GB sticks on my machine (sig) It would barely run stock with 4 sticks. As you can see I had to go to 2x 2GB sticks and while my OC is not what it once was I was able to run something decent. Anyway these boards do not like 4 sticks.

If that does not work set all voltages to auto except the CPU voltage and let it go through its reboot cycle.
If you have to do that you need to go back and see what you can reduce and still boot, auto voltages will set some of them much higher than needed.

Thats my best shot, as I mentioned these boards do not like 4 sticks and are very twitchy about finding settings that will work. good luck,