would my bronze xfx 550w psu be suitable for a AMD 5970 graphics card?
I normally run a 7970 , which my psu runs fine , i know the 5970 uses a bit more power , but should the my xfx bronze 550w be suitable for the 5970 card ?
It might work and idling would be fine but under load it would push the PSU to it's absolute limits which isn't really a good idea. If you want that card you're going to need a more powerful PSU, but I don't know why you would change. You'll get similar performance from the 7970 without CF issues.