Hd 4890 2gb crossfire vs gtx 460 sli

[piego59]

hi everyone

i got 2 gtx 460 1gb running in sli
today i got a hd 4890 2 gb vapor x

i was wondering if i got a second 4890 2gb, will it outperform the gtx 460 sli?
if so, i would get a the 4890 and run it in crossfire, since they r quite cheap to get and sell both gtx 460 and make some money out of it

ps: i play in high resolution 1920x1080


my system specs: i7 920, asrock x58, 12 gb ram, psu corsair 950w

thank u all for ur replies

 

[piego59]

the gtx 460 is the gigabyte oc 460 windforce

 

[piego59]

i guess i'll keep the gtx 460. it's newer... but doesn't the 2gb make a difference?