video card too much power for my pc?

let me start off by listing my specs, i built this 2 years ago

AMD Athlon 64 3000+ 1.8GHz Venice Core
DFI nF4-DAGF
Rosewill 600Watt PSU http://www.newegg.com/Product/Prod [...] 6817182032
1gb ram PC 3200
NEC DVD Burner 3540A
ATi Radeon x600SE


I'm planning on buying a 8800gt, or a HD 3870.

I know that my CPU is not great but thats what i have, i want to know if i buy one of those two cards, will any of my parts be damaged because those video cards run too fast for my current parts? I asked my computer teacher today and he told me by doing so it will damage my CPU and whatnot. I really don't want to upgrade my CPU + Mobo + Ram until the new AMD Phenom cpus come out, and i want a new card now so that i won't have to buy one later and the reason i want it now is because i want to play CS:Source and TF2. I don't wanna have to go buy a 7600gt or a x1950pro, then later on spend more money on a DX10 card for my new build. Im still in High School so money is really tight. what do you guys think?

because i can afford the HD 3870 and the 8800gt

also, i don't care if my PC is bottlenecked, i just want to know if putting in a really fast video card can damage my parts because its running with crappy parts that were par 2 years ago because thats what my computer teacher told me and im just like wtf?!?!

That PSU was sub-par two years ago... So, I guess that if you can afford to add a 3870 and an 8800gt, then you can afford a reliable PSU. Either that, or you will indeed 'be just like WTF'ed'.

Nah just get the 8800GT