So for the past couple of months I have been running Source SDK with no problems at all. Very recently(a couple of days ago this started happening), I have been running into problems with the rendering of the 3D views. If I'm moving around in say, for example, the 3D textured polygon view, SDK seems to crash my GPU.

Sometimes it happens right away and a lot, sometimes it doesn't happen at all, but I'm not sure what is happening. Sometimes, the program will just freeze. Other times, my GPU will just shut off all together. Other times, my screen will become very speckily, and even if I shutdown SDK, the specks still appear all over my screen, even in my task bar.

So, I'm not sure if this is a problem with my graphics card dying or if it's a problem with Source SDK. I've tried reinstalling SDK, but that doesn't seem to work. I'm assuming it's that my GPU is dying. Anyone ever have any problems with this?

PS: This happens in Hammer Editor with CS: Source engine.

My Specs:
Motherboard: ASUS MA599X Evo
Processor: AMD FX-4170 Zambezi 4.2GHz Quad-Core
RAM: 8GB Corsair Vengeance DDR3 1866(PC3 15000)
GPU: EVGA Nvidia GeForce 9800 GT 1GB 256bit