I have an old pc that I just can't quit on, its running with Gateway Southlake D915GSE Motherboard 4000958. Every now and then it shuts down on its own because the cpu gets too hot, so I bought a heatsink fan (socket 423 for pentium 4). I don't know much about pc's but I cannot see any space on the motherboard to install this, I know it goes over the cpu. I've looked into my tower several times and compared it to the pics online for my motherboard. Is it possible its so poorly designed or am I just not seeing it ?