Today i have received everything for my new pc except for my Graphics card (MSI 560 TI Hawk)
Now my question is if it would be possible to build that new pc and use my old 8600GTS (don't laugh!) till my 560TI arrives, or will this ruin my settings?
There's really no reason that you couldn't use the old one in the interim, or if your new motherboard happens to have onboard video, you could also use that. It might even be better than your 8600.