I friend of mine has his computer in a desk like that and had some overheating problems. All he did was take his side panel off the computer case and open the door of the desk. So maybe you could cut a bigger hole where the precut hole is and add one or two fans. But I think most importantly for you is to take the side panel off of the case. Or another thought may be to cut a hole in the back panel of the desk so your powersupply and any other fans you have sucking air out of your computer goes directly out of the desk.