Display card dilemma

[qw123454321]

Hey guys, I have a MSI GTX570 and I am satisfied with its performance. But a few day before, I went to a store and i saw there was a Inno3d gtx580 which only cost $2700HKD (around$350USD). It's original price was around $4000HKD ($500USD). So should I sell my 570 card to my friend and get the 580, or just keep the 570? Could you guys gime me some advices?

 

[clutchc]

It all depends on what's worth more to you. This amount of performance difference... or $2700HKD ($350):
http://www.hwcompare.com/9132/geforce-gtx-570-vs-geforce-gtx-580/

 

[qw123454321]

Best answer selected by qw123454321.