Would you replace your motherboard with a different model, without reinstalling Windows? I wouldn't.
IMHO any one who recommends a full reinstall of the OS to fix an issue ( especially hardware ), has no clue what they are doing.
Video cards are a little less intrinsic than a motherboard, but they seem to share a certain degree of "breaks if you look at it wrong", and reinstalling the OS can't actually hurt.
I think it's a software issue, because before formatting it worked like a charm when I updated the drivers but after some random hours it started acting slow again. Everytime I installed new drivers it worked perfectly, can't be a coincidence...
Now that I've formatted and installed everything again, we'll see what happens...
I'll start with Borderlands 1..
Before: around 30 fps with max settings
Now: +70 fps (or more, cant really tell because it runs so smooth) with max settings
Edited by NukeCorr, 12 October 2012 - 07:32 AM.