Most likely no. I looked at emachines before and they have junk power supplies, not enough wattage and more importantly not enough amps.
I concur, especially the older ones. Emachines were made to be a lower end Gateway, not to play games on. Check the PSU you may want to see if you can't upgrade it.
I have a 300W power supply. I have an 8600GT running just fine in it tho, so do you think i'll be okay? if not can i upgrade my psu real quick?
a 8600Gt does not need a PCI-E power connector and draws far less power than an 8800. You will need at the very least a GOOD 450W. I'd prefer a 550W to be safe.