I recently bought a Radeon 4890 used for my computer, because from what i can tell, it is faster than my GTS 450. Even in tests i ran, it was a decent upgrade. When i play games however, i get as bad or worse performance, and neither the GPU or CPU is going abvet 50% load. I have no clue why World of Warcraft is lagging out with the GPU at 40% load. Any help would be appreciated, thanks in advance!