We use Enermax Liqtech TR4 II 360 in the 2990 render farm machines we build. We place the fans and rad in the front of the case drawing cold air in and then add fans to the top of the case venting out. Our machines are lined up on shelves side to side. When rendering temps are in the high 60's to low 70's. However, we do have a climate controlled room set to 70 with extra fans circulating so it really isn't an apples to apples comparison to workstation in an office.