Black screen after slight overclock

[Giskhin]

I bumped the bus speed to 305 for a 2.8 ghz overclock and got a restart when gaming. I haven't touched any voltages and I have not upgraded my bios.

I did set the PC health status at 70C but Speed fan has only showed me a temp around 40C after starting up, bios shows me a temp of 23C at startup.

I have the following rig:

q6600 B3

gigabyte p35 ds3r

g skillz ram (2gb kit)

evga 8800 gts 320mb OC edition

thermalright 120 extreme with a silverstone 120 cranked

What steps would you recommend I take to figure this out? I also got a reboot and black screen and one blue screen when I tried vista for a few days. The bluescreen happened when installing software for a mouse.

 

[GuitarDaddy]

I would suspect ram as the culprit. I would first drop back to stock speeds and run memtest86 for awhile to make sure your ram is good at stock speeds. Then you should set the memory divider at the lowest setting, and use the memory tab on CPU-Z to verify that as you increase the FSB the memory stays at or below stock speed. Once you have found your max stable CPU overclock using this method, then you can work on overclocking the ram

If your using DDR2-800 memory your board probably sets the defualt divider at 1.5, so that when you run stock speed with the FSB at 266 you get 266x2x1.5=ddr2-800. So if you raise the FSB to 305 without dropping to the 1.0 multi you get 305x2x1.5=ddr2-915 which is likely too great an overclock on your ram without loosening timings and increasing ddr volts. If you drop to the 1.0 multi, you can go all the way up to 400FSB before you start overclocking the ram

 

[Acanthus]

I had similar strange stability issues, with the same mobo and cpu.

It was the power supply, not enough juice on the 12v rail.

 

[Giskhin]

I'm using the Corsair 520HX though. In addition, when I was running vista, I got a shut down and the system would not power up for about 3 minutes. That was pretty odd. I figured it was just vista.