Honestly I've looked at both of these cards and I have a general sense of what these cards are.

9800GX2 is like 2x of those G92 8800GTS 512MB video cards but inside one enclosure.

GTX280? The newest card for like $500-600.

Recently my G80 8800GTS 640MB has been acting weird, over heating (over heated for the first time during one hot day when I had a BBQ and left the computer on in a closed room which was a bad idea) and weird things has happened to my computer like screen messing up and not receiving signals from my GPU or something.

The problem is once I buy a newer card, I would probably have to upgrade my 600W power supply which would be irritating but this isn't the crux of the problem.

I don't know what to do with my computer anymore. It is like a fricken leafblower/mass 2.65TB storage/heater/fan (5 fans)/music listening/anime/gaming hybrid beast that is hard to maintain.

Here's the question. Should I upgrade my videocards? I don't want to tread on uncharted waters so I'm sticking with nVidia, not ATi. Is it better to wait for a "real" upgrade since the new video card's are like rebadged 8800's?

Edit: BTW I'm not a hardcore gamer. I play lots of low requirement games like Warcraft 3 and WoW. I just want a silent and nice card. I heard the new cards compared to my G80 8800GTS have better performance and less noise/heat.

Have you checked for the contact between the heatsink and the GPU core? Might be worth a shot if you don't want to spend the money for a new card.

Your 8800gts probably has a lifetime warranty, why not take advantage of it?

thanks guys, ill take a look