I've returned to the shop where I bought my materials and tested some things, my mainboard died, but my graphicscard did as well. The graphicscard is being processed for RMA and I should recieve a new one by the end of the week. As far as my mainboard goes, the shopmanager gave me the option of buying a eVGA 680i SLI mainboard for an additional 75 euro's, what comes down to a 75 euro's discount for that mainboard. So I took the deal. Got home, installed everything and everything worked fine. Got a X1600 to work with my system untill the new graphicscard gets here.
Tried some overclocking and here are some pics.
I'll try to see where the CPU can end up, but this is as far as I could push my memory for now.