A great way to test this out would be to run the DOTA test that Anandtech did. Same settings, see what results you get. Good test for CPU and GPU together.
Lets look at the whole picture not just one test.
In the cinebench, pcmark, 3DMark test group: SP3 won 4, SP2 won 5, with 2 Ties.
most differences were less than 10% with 1 each between 10 & 15% difference (11 & 13%).
In the browser test & other 3D mark group: SP3 won
7, SP2 won
Zero, No Ties.
3 test were won by 10% or more, 4 less than 10%.
Then you have DOTA and WIFI. sp2 wins DOTA by 40% and SP3 wins WIFI by 39%.
SP3 handily won all the browser tests, and the WIFI test and was pretty even on the rest with only one exception. You know what. I don't even have to think about this. I'll take the SP3 every time.