I have free electricity atm, so the voltage etc dosent really matter for me.
Should i still go for the 7950? Kinda had my mind set on that 7970

your temps will drop like a rock if you get that voltage to the proper level.. typically i have it at 0.05v above my mhz level. its WAY better for your cards, you'll reduce how fast you heat up the room and it'll be quieter with the fans slowing down some
for example: 1.0ghz = 1050 (1.05) voltage in afterburner
also.. the 7970 is about 5-8% faster mining vs a good 7950.. but 33% more money (400 vs 300 usd in the states)
already ordered the 7970=P
Still have 2x pci-e16 slots over, so might go for those in the future.
Btw, are ALL of those cards voltage locked? Or just the newer editions? And what temperature are your cards at when mining?
Even if i manage to burn it out after a while, 2 year waranty should help, no?