can a 2 year old 500w PSU power my new am3 system with phenom ii 955 O.C.+ a 4890?
I only need the PSU to last one more year.
Next year i'll get a 2nd 4890 and a 700 watt PSU
Note: my current PSU only has 1 6 pin PCI power plug, I will get a 2 4 pin transformer which will power another 6 pin for the 4890, will this affect it much?
NO, do not buy generic power supplies, for a 550 watt, which is what a 4890 requires, we are only talking ~$80 http://www.newegg.com/Product/Product.aspx?Item=N82E168...
A generic 500 watt wont come anywhere near that one, hell i have seen some 750 watt power supplies that arent capable of matching that corsair. Pay the money, get a good power supply, avoid having issues and having to buy a good one later on because the cheap one crapped out. Its cheaper to buy right once than buy wrong multiple times.