i would not recommend it personally too many issues with crossfire, you would be much better served by a single (or dual) 6950/70 or gx 570/80 any of those cards would be a huge leap from a 5770, what are your full system specs including the make and model of your psu and your monitors resolution?
got an amd black addition dual core but unlocked cores
ati 5770 not overclocked
vengance 2x2gb 1600mhz memory
cpu i think is 600 watts
MSI 870-C45 AMD 770 Socket AM3 GB LAN 8 Channel Audio ATX Motherboard
64bit windows 7
was only going to get the one but then decided before i get anything i would pop on here to find out more about it
yeah I mean I would personally get something along the lines of a 6950 2 gig, or gtx 570, that is if you are playing at 1080p... what is your monitors resolution and the make and model of your power supply...
your psu sounds sketch although it says a high wattage it is not from a known manufacturer such as antec, corsair, seasonic, or xfx... you will likely be fine for a single gpu but if you are getting crashes or BSODs then its probably your psu not delivering the specs that it supposedly can produce btu with no efficiency rating or specs you can only speculate as to if it will work (don't worry it likely will but Im just prefacing you) If you are playing at 1200p then id suggest no less then a 6950/70 or gtx 570... I got mine for 304 AR and play at 1920X1200 everything works great... if you want to save money you can try to buy the reference 6950 2 gig and flash ti to a 6970 although with that psu I would not try it...
i have the amd dual core black edition lol but cores unlocked and overclocked runs 1000 times quicker now and video card wise im still not 100% sure on ill either go for the 6950 and buy a better psu or just go with the 6970 but im swaying more towards the psu and 6950 because well its cheaper
yeah I'd get the new psu and then try unlocking a 2 gig 6950, even better you can just unlock the shaders and then oc yourself while periodically monitoring temps, that would probably be the best bet and your 555 with unlocked cores should be able to handle it no problem...
your cpu is basically the same as mine (a p2 955) with unlocked cores, although I do have mine running 100% stable at 3.9ghz with stock voltage