I just installed my new i5-3570K today, been a bitch getting windows set up and everything. Now that everything is finally working, I went ahead and started doing stress tests + gaming. However, any time my CPU gets somewhat to a high usage, my computer completely locks up, sometimes recovering extremely slowly. I'm thinking its my PSU, which is only rated to run at 500W, which is now lugging around a 6850 and the 3570K. Also, my power supply does not supply an 8pin 12v to the CPU, only a 4pin 12v.
I think its the lack of the 8pin 12v rail to the CPU, but I just want another opinion before I have to lay down $100 on a power supply.