My Rig;
Cpu: I7 D0 @4.2ghz w 1.248v batch#3931A
Motherboard: GA-UD3R
Memory: 3x2GB OCZ Plats. 7-7-7-24@ 1600 mhz
Gpu: Sapphire 5850 @1000/1250 w 1.2v
Cooling: Megahelem w Ultra Kaze 2000rpm
Psu and Case: CM Real Power Pro 750W and CM690 case
OS: Win 7 Pro 64bit
If your temps are good the 720 can handle 1.4v -1.45v on the NB no problem.
Matter of fact i needed +.250 for 2600mhz on mine on water.
On Air you may need .025v maybe more ..
CHEW is right on when it comes to what chips like.
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