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So I want to go for the 280x the most because it gives me the option to CF and seems like the most powerful and is the cheapest. Should I upgrade my power supply or will I be alright if I don't overclock. Or is it a possibility that my Power Supply could break and damage expensive components and I don't want to risk that?
I agree that power-supply aside, the 280X is the pick of those cards, especially given its price.
But it's a really bad idea to run that card on your powersupply. You might be okay, but it will be a poor quality PSU pushed hard... it might be fine or it might catastrophically fail and take components with it.
Invest in a good PSU is money well spent. But those NZ prices are nasty.
- There are a bunch of decent 520-620W models around the $110-120 NZ mark, but it's hard to find the ones that are in stock. I'll leave that to you. The models I'd suggest looking at are any of the XFX or Seasonic units, or the Antec HCG units (don't go the Antec VP ones).
OR - if you want to buy a PSU now that will handle crossfire 280X down the track, this semi-modular EVGA B2 unit is by far the best option on the pricespy website at $165:
http://techworld.co.nz/evga-0850-supernova-850w-semi-modular-80plus-bronze-p-53210.html
Someone with more knowledge than me might be able to find a gem amongst those piles of cheaper $70-100 units. There probably are some reasonable models in there, but there's none that I know to be good units and if it was my money, I'd just spend that little extra to get something that I know to be solid.
I wish I had better news or ideas for you.