Gibbo that Physics score is very low for 5ghz, i score 13100 @4.6.
I've encountered an issue while using my 290X and my 4770k.
The issue seems to stem from the gpu lowering it's clocks when idle.
EG, i leave the card at stock without touching any settings in afterburner like extend official overclocking limits, disable Ulps, so both these settings aren't checked, my Physics score on both firestrike and 3dmark 11 drop by over a thousand points, as much as 2 thousand sometimes.
The only fixed I've found is to check both Extend Official overclocking limits and disable Ulps, thus stopping the card from lowering it's clocks when idle.
This results in my Physics score being as it should in both benchmarks.
Firestrike without fix
http://www.3dmark.com/3dm/1504194?
Firestrike with fix
http://www.3dmark.com/3dm/1489527?
3D Mark 11 without fix
http://www.3dmark.com/3dm11/7380118
3D Mark 11 with fix
http://www.3dmark.com/3dm11/7419582
Don't ask me how a GPU can effect a CPU test because i really haven't got a clue, but over the last few days i've tested and tested, the results are replicable using the method i've spoke about in afterburner.
Would be great if you could test it too though.