So I bought this card off newegg a few days ago and I got it in yesterday. After I installed it, booted up and started running benchmarks I noticed that I was getting worse results than with my old 4850. I noticed that the core clock speed was only running at 400 mhz and the memory was running at 900. I rebooted and this put my clock speed were it was supposed to at 850 mhz and the memory at 1200. After a while it dropped back down to 400 and 900. I rebooted again and the clocks have held steady at 850 and 1200 since. What could be causing this? Should I go ahead and return it?