Random Il-2 CoD crashes. PLEASE HELP!!!

[1.JaVA_Platypus]

The PSU is from a brand named "blackpower". I can't find it on the internet, but the company is possibly bought by OCZ. It says 580 Watt, but i highly suspect they did not have in mind that one day, 3D accelerator cards would need two PCI-E connectors.

So, I ordered an 850 Watt XFX PSU today. It'll take a while to arrive with easter. So I put in my old HD4870, wich never crashed before. I can do Il-2 1946 with it on the highest settings and postpone my Il-2 COD for a few days.