Do you think my PC is overheated?

[Angrist]

When I dusted out my PC, I opened it up and removed the thick patches of dust. I guess the problematic dust is still there then. I'll find an air can on Monday.

My desktop PC is basically standing on the ground with my bed next to it. It's not a tight fit or anything, and the area under the bed is empty. The air next to the PC isn't hot or anything.
I'll make a picture tomorrow, when I have some better lighting to work with.

Oh and I don't think I've ever taken a lot of care of my PC hardware... Never knew I had to.

[Seth]

If there was thick grouping of dust, there's a good chance that your little fans have a bunch of mucous dust that doesn't accomodate air slipping past the blades very well.
The vent that needs to be relatively clear is your out fan vent. Your intake doesn't matter so much, but if the hot air has little room to dissipate away from the case, heating will happen. Ideally, a cracked window or cool air source will greatly lower running temperature. There's a balance during the winter months, if your rig is a power hog and generates a lot of gaming heat, then you can essentially use your pc to grab the cold outside air and level it to room temperature without needing to spend money on higher thermostat use.

What kind of psu do you have? If you have extra fan cables(4 pin i think), maybe purchasing a 10 dollar fan would help. Depending on your case, it might require you to make a mount for the fan. On newegg I spent 30$cdn on a coolermaster heatsink(that was massive and wouldn't have fit in anything smaller than my monster case), and it works great. It's got quad copper pipes and a ton of surface area. It is also snap-on upgradable for a second fan on the heatsink which I'm planning to get once I start overclocking and jamming more gpu's in. Pretty cheap alternative.

I'm not really sure about your GPU temp, but from what I've read quickly, it wouldn't hurt to keep your gaming temp below 80 C for that card. An extra gpu fan will probably give you a 5-10 degree drop. Don't think your gpu is much of a problem. My gtx 460 is an MSI hawk so i have dual fans inside a shroud. The cooling system is a lot different than a stock 460's, so I can't add a third fan very easily. I'm a little concerned about SLI'ing another hawk since the pci slots are next to each other and the shroud's extension doesn't leave much room for air to flow.
Depending on how the new cpu+gpu intel and amd offerings are designed(if they're AM3 compatible) i might upgrade to one of those in order to share the gpu load, then use my current 460 to handle physx + another nvidia SLI'd.