If you are creating a single processor workstation then the i7 930 is the way to go..
So, you think 16 % more Ghz would be greater than 50 % more Cache ? ... why? I want to understandt.
The 16% more GHz difference can be upscaled to 50% easily.. Cache count doesn't matter much over the sheer speed especially when it comes to rendering.. Moreover, Xeons are server domain processors designed to run in multi CPU environment and thus are provided with two or more QPI links.. The below link will give you an idea of the comparative analysis in stock conditions..