well, as it's beta driver, you see that 3dmark11 says "Graphics Driver not approved.", or it could be that Futuremarks still has'nt updated their databases..
Yes, it's performing better than stock 640m, much better, as
Notebookcheck shows 3dmark 11 score of 640m as 1844.2, which is of GDDR5 640m, our 7730m is a ddr3 card, and still scores much higher (20pts) than GDDR5 640m, as i read somewhere that Directx11 has about 25% performance increase in GDDR5 against ddr3..
And yes, i have lowered down the clock to default stock, will use only when needed, and it's still not intensely tested, so let's wait for some other users to test these settings for longer use..
And once official drivers are launched, i see these cards going ~2000 on 3dmark11, hope this happens..