Yes it dows. If any damage is done(i mean reversible) just set to default and claim warranty, don't tell the idiot techie tht u Oced....
Now for the Q6600, yes, oh but noooo, DG 33 suks in OCing.
U do it from the bios, slowly increasing the FSB, inistally 5FSB shud be enough.
Try to clock at 2.8GHz, that shud be a wonder with DG33.....
And increase the Vcore(max 1.43 for you, a li'l increase shud be enough, again from the bios, but don't even by mistake exceed, or ur procc will be baked b'fore u can say OOPS!)
And don't xpect good oc cause of mobo restriction....
8600GT yes, 256mb ddr3 is nice, if ur card runs cool(rare for a 8600GT), then try riva tuner, and increase the memory and core and shader clocks one by one. Don't increase more than 30Mhz for each, however, memory is 45Mhz + go ahead....
If u do it sweetly, u'll get a 30% increase withur 8600GT and another 10% wid the procc...