well does the phenom's L3 cache really make a diffrence in games?
This should answer you're question as this clocks a phenom ii down to athlon ii speeds. Measuring just the performance differance between the L3 cache and no L3 cache.http://www.tomshardware.com/reviews/athlon-l3-cache,2416.html
Will is make a difference. It could have some noticeable affect on some game but most of the time, the difference will not be noticeable.
On the cpu side of gaming: the GHz of the particular cpu will affect the performance of a game more than the cache in a cpu (up to a certain point on some (if not, on most) cpu's.)
Although the Gpu performance will have the most effect on the majority of games.