I dont think its possible to replace those with screws, just buy an aftermarket cooler like the coolermaster hyper 212 evo, I'm using the NZXT Respire T40 with 2 fans on a i5 3470 overclocked to 4ghz, max temps while gaming are 55-58c, and 61-65c when running Prime95. Both are around $33-40, the...