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* Mainboard: ASUS P5Q Pro (BIOS 1104);
* CPUs:
o Core 2 Extreme QX9650 (3.0GHz, 333MHz FSB, 2 x 6MB, Yorkfield rev. C0);
o Core 2 Duo E8500 (3.33GHz, 333MHz FSB, 6MB, Wolfdale rev. E0);
* CPU cooler: Scythe Mugen (Infinity);
* Memory: 2GB DDR2-1111 SDRAM (Corsair Twin2X2048-8888C4D);
* Graphics card: OCZ GeForce 8800GTX;
* HDD: Western Digital Raptor WD1500AHFD;
* PSU: SilverStone SST-ST85ZF.
The Intel P45 Express based solutions tested before coped well with dual-core processors overclocking, but couldn’t succeed when it came to overclocking a quad-core CPU from Core 2 Quad or Core 2 Extreme family. Therefore, we performed a few experiments with different CPUs on our ASUS P5Q Pro trying to reach maximum FSB frequencies.

First of all installed a Core 2 Dup E8600 processor – a new CPU with a more overclockable E0 processor stepping. Its nominal frequency is 3.33GHz and the multiplier is set at 10x. Managed to reach 4.4GHz with the same multiplier and increased to 1.4V processor Vcore: we only had to push FSB frequency to 440MHz.
The system was absolutely stable, according to the Prime95 test and a 1-hour OCCT Perestroika run.
In other words, ASUS P5Q Pro is far not the best platform for quad-core processors overclocking. Solutions on Intel X48 Express seem to be much better cut for this.