I have a DV7 4295us. it has a Sandy Bridge I7 Second gen 8 core. 6570 graphics 8 gigs of ram 1 ter HDD. I have had the Laptop for about a month and the HDD goes out. No prob, stuff happens, I called they sent me a new one really fast. I installed it and reinstalled the operating system, reloaded my games and every one of them lagged now. Not before. i looked at the Win Index andn the CPU droped from I think 7.3 to 5.3, why. All the other components are the same. I cant think of anyway that a HDD has anything to do with a CPU. So anyone have any ideas? HP has been useless, I paid 300 bucks for the extended in house warrenty and they do nothing. It is really ticking me off. Anyway, why the drop? Anyone? I did reinstall it again on the bad hard drive and it went down to 5. What are they up to?