I have recently replaced my motherboard. The new motherboard is an EVGA nForce 780i SLI. Here is the pertinent spec of the PC:
Mobo: EVGA nForce 780i SLI
CPU: Intel Core Duo 2 E6700
RAM: 4GB OCZ Model No. OCZ2N10662GK
BIOS Version: P8
(The RAM modules I am using are on the compatibility list of the motherboard manufacturer.)
After all the hardware was setup I am running into the following problem:
WIth 4GB of RAM installed I had problem with installing Winodws. (I have tried it with both Win Server 2008 as well as Vista Ultimate.) When I strated Windows setup I got the following error message: Error: access violation (0xC0000005), Address. I tried couple of more times, double checking my BIOS settings but the same error would occur.
I decided to remove all RAM modules. leaving ONLY one GB behind and Windows (both Win Server 2008 and Vista) installed fine with NO errors.
After Windows was fully updated (Vista was updated to SP1) I added 1 additoanl GB of RAM; now the system has 2GB of RAM installed.
Win Server 2008 Boot Manager gave me an Error at startup. I have attached a screen capture of the error screen.
Vista Ultimate started with NO errors.
Then I installed 4GB of RAM and BOTH Win Server 2008 as well as Vista gave me the same Boot Manager Error message.
I then did some more diagnostics and investigation and following are my findings:
1) MOST IMPORTANT: I have determined 100% that whenever four sticks are installed, there is a major issue with POSTING. The PC will turn on BUT will NOT POST! Then I turn it off and then ON and sometimes on the first try it will POST and sometimes on the third, fourth or even FIFTH try it MAY eventually POST!
2) I have used Memtest86 v3.5 and so far 3 out of the 4 sticks, tested individually, have been 100% with NO errors after 3 passes. (I did not have enough time to check the 4th one and will do it later today but I suspect it to be OK as well).
I have also tested each slot/bank on the mobo separately using one of the known GOOD sticks and all banks returned NO errors after one PASS with Memtest86.
I also tested with two sticks installed and after 15 passes Memtest86 returned no errors.
3) Called the RAM manufacturer, OCZ, and they told me to set the memory timing on manual and match it to the stick's specs. They also told me to set CMD to 2T whenever I have more than two GB installed. But that did NOT fix the problem.
I called them back and they told me to increase the Voltage and increase the timings: instead of 5-5-5-15 to 6-6-6-20 with 2.2 volts. But that was NOT good either as the PC was NOT even POSTING.
I called OCZ back and they told me it may be a Hardware or Software incompatibility!! I know Windows can hanlde 4GB, specially Win Server 2008!! So I still don't understand what is going on!!!