For those who need Turbo power limit disable in P6T deluxe, and QPI SLOW MODE (x12 uncore multi, helped me to oc 10mhz bclk more) - you can try using non-native bios in P6T Deluxe.

I tried next:

ASUS P6T Deluxe 1.02G board working nicely with latest ASUS P6T WS PRO BIOS (this adds Turbo TDP/TDC Power Limit to be disabled!)
ASUS P6T Deluxe 1.02G board working nicely with latest ASUS P6X58D Preminum BIOS (This adds QPI SLOW MODE for P6T, and helped me to push bclk 10MHz more)
ASUS P6T Deluxe 1.02G board working nice with latest ASUS P6T7 WS PRO BIOS (no improvement with this)
ASUS P6T Deluxe 1.02G board working nice with latest ASUS P6T6 WS PRO BIOS
ASUS P6T Deluxe 1.02G board working wrong with latest ASUS Rampage II Gene BIOS (boots, but biosblock corrupted, there is some hw protection for sure)
Do it on your own risk.
ASUS P6T Deluxe 1.02G board NOT working with latest ASUS Rampage II Extreme BIOS
ASUS P6T Deluxe 1.02G board NOT working with latest ASUS Rampage III Extreme BIOS

P6X58D work best for me in P6T Deluxe, and have 8 oc profiles, in comparsion to deluxe bios with only two
Prooflink with whole description follow here http://kingpincooling.com/forum/showthread.php?t=669



This is with P6X58D bios. With native P6T Deluxe bios - NO WAY to get bclk past 220 on my rig.

Just FYI