You'll have to contact gateway for the answer. Your board might post with an "unknown cpu". Many oem setups don't have any bios updates for newer cpus. It's time consuming for the manufacturer's to change the bios, and they would rather you buy a new system than upgrade. If your gateway has a windows version that requires a genuine gateway bios to work, you may have to format and use a dell windows dvd to reinstall windows with a board changeout. I don't know if dell makes a 64 dvd for sale. They're only $16 at a few venders, but I haven't seen a 64 dvd yet. All are 32 versions.
I followed your advice to contact gateway and I got this reply:
"Sorry to inform you that Gateway always recommends the same
specifications, as it was, when the computer left the factory.If you
want to change the specifications according to Gateway's Standards, you
can go ahead and do it. However, if anything happens causing any
damage to Gateway's product while doing, we will not be responsible for
So, basically, "we dont wanna tell you what CPUs are compatible". Is that ridiculous or what?
There is also a good chance your motherboard only supports 95W processors, as many of the early 780G motherboards were only designed to handle that and could not handle using the high end 125W processors.
You just came across one of the many reasons a lot of people prefer building their own computer.
The PC is not too bad as it is right now. On the vista performance rating it gets 5.9s across the board. So I think it will be good enough for maybe 2 years or so. After that I am pretty convinced that i'll build my own though.
I was looking at my PC on newegg, and noticed a review that reads:
"This system for me is no longer as I turned it into a project PC, first switching out the 1.8ghz Phenom for a 3.0ghz Phenom II socket AM2+, then i added 2 extra drives(500g 7200 SATA, and a WD Raptor 300g). After that I put in a 750w power supply. Following all this i replaced the motherboard for a Crossfire capable board and added a 2nd 1gig 4670. My final upgrade will be changing the ram to 8g 1033mhz ram."