I'm debating on whether to spend and extra $10 to buy a bunch of VRAM heatsinks for my XFX 5770 I will be getting. The GPU heatsink on the "Non-Juniper" version is not in contact with the VRAM. Will I run into issues down the line with really heavy gaming?
There is no point in getting those. The XFX 5770 already has a good cooler, and the 5770 runs cool anyways. You should be overclocking very nicely and will hit GPU-artifacts long before your VRAM overheats.
Well, Im not planning on overclocking anything of mine...
While Im here, I want to ask if MOSFET heatsinkinks on MOBOs (Generally to the left of the CPU socket) are necessary, again with no overclocking... Im just unlocking the 3rd and 4th cores on my Phenom II x2 555 3.2ghz
No additional heatsinks are required for any hardware running at stock speeds. The components were designed and thoroughly tested by the manufacturers to run for a long time at stock speeds. There's no need to try and out-think the engineers who designed these products.