@troll93: Bearing's probably bad on your GPU fan. You could swap the heatsink/fan, but if it's three years old, the price of an aftermarket cooler and the work it'll take isn't really worth it.
Clock speed doesn't mean performance when the architecture is the same. A 1.7ghz i7 mobile will run circles around a 3ghz Pentium 4 while running cooler. Think of a hz more like container than a unit of speed. A truck carrying 900 2 liters of pop will carry more pop than the same truck carrying 1,100 cans of pop.
What resolution is your monitor? The 290 is around 30% faster than the 770. It also draws 25-30% more power, generates that same difference in heat, and because of that, will generate more fan noise. At 1080p, you'll most likely be CPU bound before you're GPU bound. It's once you get up to higher resolutions that the 290's going to start pulling away from the 770.
The 770 has 2gb of DDR5, the 290 has 4. The 2gb of ram is the biggest issue. The two cards are priced so closely that I would rather deal with AMD's crappy software (Or lack thereof, as I lost the ability to launch Catalyst eons ago.) then be stuck with a card with only 2gb of ram. If heat and noise is an issue, you can underclock and undervolt the 290 and still have more performance than the 770. The 290 has a big fat 512bit bus for the memory as well.
The 770 is a good card for now. The 290 is a good card for now and tomorrow.
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