So my last computer died on me and I've managed to save up about $500 for a new computer. I like the smaller form factor of the htpc, so I've decided to go that route and configured a mid range gaming and school pc, however it's my first actual build so I am not too sure if they're the best or even compatible components that I can get for the money.
What I'm wondering, is if the cooler will be too big for my ram or box. The box is 11.8 inches tall, while the psu is only 3.4, and if the cooler is 6.3 then I still have about 2 inches of headroom, hopefully. I want this cooler because I would like to overclock the amd to 4Ghz, and have it move plenty of air around in the case and keep it as cool as possible for cheap.
I'm assuming you are reusing the ATI Radeon X1950Pro. If not, do not buy it. Go for something newer (DX10/DX11 compatible).
As for the CPU Cooler, I seriously doubt the one you have listed is going to physically fit beneath the power supply. The height of the case includes the width of the case material as well as any feet it may have. You also did not take into account the height of the motherboard tray and the spacers beneath. Your best bet right now would be to stick with the stock cooler until you know exactly how much room you have to work with.
With the money saved by not getting a third party CPU cooler, you can get a much better power supply which is also definitely going to power that Radeon X1950Pro. Corsair Builder Series CX600 V2 600W - $70