I have a Coolermaster HAF XM case. The top fan is making roaring noise lately. I plan to RMA it to Coolermaster. Process will take a week or two to get a fan replacement back. Do you think it is okay to use my computer (3770K CPU, 680GTX video card) for 2 weeks with no top fan (I do not notice any warm air coming from it - for comparison purposes, the back exhaust fan has noticeable warm air - so maybe it is not doing much in the first place)? Or should I just buy one at Fry's and not RMA the old one? Buying one at Fry's would cost me $15 plus tax, whereas the RMA will cost me $3 postage probably. To save $12 to $13, I would rather do the RMA, unless the situation could cause a heat problem?