- Joined
- Sep 1, 2011
- Messages
- 143
- Motherboard
- Gigabyte Z68X-UD3H-B3
- CPU
- i5-2500
- Graphics
- HD 6870
- Mac
- Mobile Phone
yes, your psu will do fine, no problem. it's just that rendering a given task consumes more power on the older cards and that means it is more expensive. depending on the work you do this cost might add up to quite a few bucks over the year. and the 660 does produce less heat and is generally easier to cool: silent operation.
and yes, the 580 is more expensive than the 660. it is faster as well.
take a look at these benchmarks:
http://www.anandtech.com/show/5699/nvidia-geforce-gtx-680-review/17
the 660 has roughly 2/3 of the raw power of the 680.
but it all depends on the specific work you do and if the software you use has CUDA optimization either option will be massively faster than your old card.
So, the 660 will be worth the money it costs to upgrade a card less than a year old?