Need Help Overclocking

Having alot of trouble Overclock with new DFI DK P35 T2R-S board. I have heard that this is one of the best for overclocking, but I cant even do the most simplest overclocks on it. I had recently manged to bring the CPU up to 2922MHZ and was running that stable for a week until I decided to an all nighter Prime 95, in which THAT! failed after 7 hours. I have set the Vcore all the way up to 1.34, even though it should reach it on stock. I also upped NB Vcore to 1.5 with still no evail of booting past POST after 2922MHZ. Event the slightest increase in MHZ, and now apparently, that 2922 doesnt even work. Having alot of trouble here. On my old P5B Deluxe got to 3.7GHZ without a sweat. Do I have a bad board? Using my DMM, 12V read 11.99~11.98 on boot up and thats not the 12V rail dedicated to the CPU so I dont think its PSU crapping out, since I was able to reach 3.7 on the same PSU. Please Help

- Bios Is Flashed to Latest March, 2008 version.
- RAM voltage set at- 2.07V
- NB Vcore- 1.5 (Tried it at 1.45 and still nothing)
- All RAM options are set to AUTO
- PSU has dual Rails, 18A and 20A. Im assuming 18A is dedicated to CPU
- Only change ive made from the past overclock is New GPU and new Mobo
- I have posted on my mobo's official thread with no success
- CPU shutdown temp is at 75C so I know its not temp related
- E6750 processor @ 2.66GHZ
- 2x 512MB DDR2 + 1GB DRR2 Corsair XMS (used same RAM for last rig)
- Everything in Genie Bios is at auto except for- CPU VTT, CPU Special Add, NB Voltage, RAM voltage, MHZ
- I ran the ram @ DDR2900 and the RAM booted up fine but when I brought the CPU to the appropiate speed using the 8X multiplier, froze at POST.
- The error after 7 hours was in Mersene Prime ( A DOS version of Prime 95)