Memory Voltage Question - Triple Channel 1600 + Asus P6T

I have been working on a new system build for a few weeks now:

Core I7 920
Asus P6T
Corsair XMP 6gb Triple Channel 1600mhz Kit
Corsair 650W HX Power Supply

When I put all 3 sticks in the mobo, slots A1,B1,C1 and set it to XMP profile in the AI Tweaker it usually boots just fine. However, intermittently it won't boot and I have to:

1. Reset the CMOS
2. Put 1 stick in
3. Boot into the BIOS then change back to XMP
4. Put all 3 sticks back in

Then it seems to work okay again. Setting the AI Tweaker to XMP automatically changes the voltage to 1.65v on the memory. Would increasing the Voltage create a "stronger" channel and more consistent booting?

Also note that my CPU has been running hot, 55-65c idle according to CoreTemp on all 4 cores. Under load it jumps to 75-80c. Would the heat of the CPU affect how the board boots?

My next step is to reseat the cooler (Zalman 9700) to see if the temps come down.

Any other suggestions?

Jason