Throttling problem

[Hotnuggets]

I decided to overclock my graphics cards, and im now getting a throttling problem. I have two gtx 580s that i was able to get up to around 900mhz for the core clock at 60-65 degrees max, sometimes seeing at most -3mhz from throttling. I pushed the card a little to far and while using furmark, it froze and the driver crashed. I decided to take a break and pick up the next day. When i resumed to OC, it said the clock was now throttling -675mhz. I don't know what happened between the driver crashing and testing it again, but i cant seem to fix it. I have tried reinstalling the driver, taking out one card, resetting it to default settings and nothing can seem to fix it. I did get a high cpu usage notification when using furmark while seeing if the throttling was still there after taking out one card. If anyone has any ideas on what is going on i would love to hear them.

 

PC specs:

p8 z77-v lk

i7-3770k

Corsair HX850

gtx 580

24gbs g.skill ram