I have the XFX 780i and Q9650 combo. For the past 6 months, I have had a good, stable overclock of 3.6GHZ on stock voltage. I have a Zalman 9700 and was reading 26C idle and 43-47 full load. This was the same temps for 3 different programs. I have been researching and debating OC'ing to 4.0GHZ and bumping up the voltage.
From BIOS, I tuned mt memory and tested it, the I went back into BIOS and Increased my FSB to 1800. This gave me a clock of 4.05GHZ, and upped the voltage to 1.375. FSB was set to 1.4. This is the well known OC BIOS settings for this processor/Mobo combo. I noticed that when I changed the voltages, it would stay at stock (1.3) for both V core and FSB.
I accessed windows XP 64 and opened CPU-Z and noticed I had the 4.05GHZ clock, however the V-core and FSB voltages remained stock. I performed a stress test woth OCCT and it was immediately unstable. the computer froze and I re-booted it.
I restarted the computer with stock CPU settings, however I got a BSOD, then a few more times with no BSOD, but windows froze everytime during startup.
I then when back into BIOS and put the last setting before everything went wrong. Windows opened right up, however CPU-Z only read stock voltages for FSB and Vcore. I tweaked it around and figured the only way to access windows was to put my last overclcok settings. . Anything else freezes.
Things I have done since with no success: reset CMOS jumpers, replaced CMOS battery, and flashed to the latest BIOS for the XFX 780i.
it appears the CPU is at the overclock, but BIOS is not letting me input voltages for V core or FSB. games like flight simulator X etc. are immediately unstable. temps are the same 29c idle and 43 load
I overclocked the processor speed first, the raised the voltage gradually. When I did this, the actuall voltage indicated the stock voltage evern though i entered in 1.375. stock is 1.3. there is no way to say if it was stable or not becasue i just attempted a stress test once before everything happend