Changing power supplies

Can anybody help? Thanks.

well i don't know wether gateway uses standard atx-psus or not, so that might be a problem. If it is a normal atx psu then it would be very simple to change it.

You'd need a good quality 500-600W unit to run it with nice margins for comfort. The system will use around 300W under heavy load, so you would be maxing out the stock psu. I don't suppose you can overclock it, since oem rigs tend to have their BIOSes locked up thight (overclocking an X6 will increase the power consumption (and performance) quite a lot)

1055 is a one step up from the 1035, so yours will use a little less , (this is with idling 5850 in the system using around 20W); 218W for whole system
http://www.techpowerup.com/reviews/AMD/Phenom_II_X6_105...
and if you add load numbers for a 5770, around 112W (or 85 if you prefer realistic numbers), you'll end up pretty too close to cooking the psu
http://www.techpowerup.com/reviews/Palit/GeForce_GTS_45...

you only really need a good 300-350w unit for a 5770. im not sure how good the gateway unit would be, but i would swap it out for somethng in the 400w+ range from a good psu maker like seasonic, corsair, antec etc. a good 450w antec PSU will set you back less than $50, that is what i would go for.

that wouldn't leave much room for a future upgrade, though. And at least over here the price difference between good quality 400 and 600w units is pretty small.

a 450w antec is about $50 while a 600w unit is near $80, that is a big enough diff in price to go with a 450w unit that can power a 6850 quite easily. I dont think the guy is going for a gtx480 or anything.....

if he has the same prices, then yep, fair enough