Performance loss


My PC specs are:

Asus P8P67 Deluxe
Core i7 2600k w/ stock fan
4x2G Elixir CFD W3U1600HQ-4G
Sapphire Radeon HD7850 2GB
Corsair TX650
Coolermaster HAF 912 with 2 chassis fans

My problem is the following. I've just bought this PC and was getting scores arround 7000 on 3dMark11. I use asus optimal presets on bios and change my 7850 core clock to 1050 with amd overdrive, but i'm not an expert so i don't risk changing advanced settings or any voltage. Then suddenly, when i tried to change the memory clock of my 7850 on overdrive i got a blue screen and had to manually restart it. Since then, i can't get past P5200 on tests. It even says my PC is underachieveing. I was getting arround 11000 physics score and 6000 graphics score, but now i get 8000 and 5000. I have already undone the OC, ran scandisk, reinstalled drivers and all, but nothing worked. What could be the problem? Maybe i messed my components?

Here's my clocks on CPU-z and gpu-z

And here are my scores
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More about performance loss
  1. Nobody?
  2. Try the tests with your A/V disabled?
    Can you still game at the original level of performance?
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