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WILL my psu be fine with either of these cards
Gigabyte Windforce 3x GTX 670 is a good one.
At a maximum overclock the 7970 will be faster by the way by a small margin. If you're not going to overclock then I'd say you should pay a little extra and get a 7970 Ghz Edition.
The vtx is at 1050 MHz anyway, same as the GHz editions. There is the wind force 1100mhz which is faster but another £100
I would say its worth trying the vtx, you have 14 days to send it back if it has coil whine. For £300 with sleeping dogs it can't be matched by a 670.
I would go for the £300 VTX3D then as well.
Gigabyte windforce 7970 and for £280 I will stick my neck out and say price/performance/cooling/overclocking combined make it the best option.
+1
I'm very happy with mine
Gigabyte ATI Radeon HD 7970 Windforce 3X 3072MB £300
or.
MSI GeForce GTX 680 Twin Frozr 2048MB GDDR5 £372
Both the same performance,