View Full Version : Help needed. Q6600 G0 and MSI P7N Platinum

07-30-08, 08:11 AM
Hello guys. Need a hand here. When I first got this board, I overclocked to 1333(333x4) FSB by increasing the VTT FSB to 1.325 and the NB Voltage to 1.32. Ram was left at stock everything, same for the Southbridge and the CPU. Initially, I flashed to a user modified bios then yesterday back to MSI's 1.1 for increased stability... The system is stable at these settings when running in single card mode. When I enable SLI, it crashes within 5-10 minutes with the nvlddmkm.sys error. What is even more weird, is if I revert back to stock speeds after the crash has occured, the system is still unstable. The only way to get the system back to a stable condition is reset the bios... Please note that the system is stable with stock clocks when running SLI, if I have not touched anything after resetting the bios.

So, I reset the bios, and load Optimized defaults. I go into the bios, disable onboard audio, fix my cpu fan settings etc. I go into Windows and can run in SLI mode for hours. If I overclock, the system crashes. I go back to stock clocks, the system still crashes. I reset the bios, the system is fine. Here are my bios settings:

333x9 (1333FSB) - Ram Unlinked or Linked at 800Mhz (Stock) (Speed doesn't change) - SPD at Auto - Stable when running one card, Unstable in SLI mode.
CPU Voltage: +0.00
Memory Voltage: 1.90 (Stock)
FSB VTT Voltage: 1.325
NB Voltage: 1.32
SB Voltage: 1.50 (Stock)

I have tried running the ram up to 2.10, and the FSB Voltage to 1.369 and the NB at 1.36. Adding .025 to the CPU makes no difference. I have not touched the SB voltage so far.

Any suggestions?


07-31-08, 12:57 AM
Update: I've tried adding =.0625 to the CPU and made the SB 1.56. Still crashed... :(

07-31-08, 03:16 AM
Which BIOS are you running right now? I downloaded the P04 performance BIOS off the MSI user forums. I have it if you want it.

I get stable at 1333MHz with no voltage changes, with the exception of the RAM running at 1.90v. Every other voltage is stable, memory unlinked and set to stock 800MHz. I just can't get 3.6GHz stable for the life of me, even with the temps I get (sub 30's).

07-31-08, 03:47 AM
I have the issue of not booting at all above 1199FSB if I don't take the VTT voltage to 1.325. I'm currently running the stock 1.1 bios. I haven't tried the P04 bios, I went straight to Bosskiller's 1.2b4 bios... Same issue, couldn't boot at above 1199 without incresing the voltages. I'm actually thinking switching to an eVGA 780i...

07-31-08, 03:48 AM
I noticed the same problem with my 790i. It's as if 2 video cards suck a lot more power out of the motherboard, thereby reducing what goes to the CPU. I also had to up the Vcore to get the same stability over a single card solution.

07-31-08, 03:55 AM
I never tried OCing with a single card. I'll try that tomorrow when I wake up.

07-31-08, 07:15 AM
I can also have it at 2.7Ghz (appears stable with SLI) so far, 800 on the ram unlinked, 1.24 on the VTT, 1.28 on the NB, stock CPU voltage. The fsb here is 1199, and even if no extra voltage is required for booting and testing, I took the values for the VTT and the NB a notch up to ensure stability...

08-01-08, 08:36 AM
Hi, is your 4gb of ram 2 sticks or 4? I need to set my nb voltage at 1.45v using 4 1 gb sticks for stability @3.6ghz - Plum

08-01-08, 11:37 AM
Running 2x2s... Got no idea what's going on. It could be that the NB can't keep up being overclocked with 2x280s... I am installing a fan on the NB next week when I get my HDT-1283... Maybe that will fix the instability.

08-01-08, 03:08 PM
I have 4x1GB. The thing about this motherboard are that there are FSB holes, so some overclocks wont work and you'll get cold boots.

08-02-08, 05:08 AM
I've installed the fan today. Been getting these weird crashes, not nvlddmkm ones. Crysis errors. Maybe the NB was getting too hot...

08-02-08, 09:00 PM
The nb on these motherboards get extremely hot extremely fast. Even with fresh air blowing on it, it manages to get really hot.

08-04-08, 07:00 AM
After a lot of troubleshooting, I decided to leave it at a stable 2.7Ghz. The problem seems to be the high FSB speed. I installed a 60mm next to the Northbridge, temps dropped but it still crashes.

I also dropped the multi to 7x333 (2.33ghz) and it still crashes. So it's not the PSU or the CPU speed. I've isolated it to the high FSB. Tried with 1300, still crashes. It must be anything above 1199 will make the system unstable with running SLI.

I've countered this by dropping my ram to 1T Command rate, which boosted my minimum FPS in Crysis by quite a bit. I don't want to spend 250 more euros in another motherboard or another CPU, which in the end, might have the same or worse problems...

08-18-08, 10:52 PM
I was reading somewhere that Quads need FSB at 1.4 minimum to hit 1600FSB. I just got a new G0 and am testing it out.

08-18-08, 10:57 PM
I was reading somewhere that Quads need FSB at 1.4 minimum to hit 1600FSB. I just got a new G0 and am testing it out.

I tried with an FSB of 1333 and 1.4, still crashes. My problem is a bit different though. It's stable with one card at 1333, but crashes with 2. Go figure... :(

09-09-08, 07:39 AM
Switched to an eVGA 780i, no problems with stability with overclocking and SLI so far, fingers crossed. Have to figure out a way to cool the bottom card though, the 280s are in different positions now...