How bad of a bottleneck will I get?

[lucasz]

I have an i5 650 running at stock 3.2ghz, 4gb 1333 ddr3, 2x 9800gt sli'ed.
I'm going to upgrade to a 7950 or 7970. I know i'll have a bottleneck but I want to know how bad of a bottleneck i'll have. Anyone have an idea? I'll upgrade to a FX-6300 later and 8gb ram

 

[Hard Line]

it won't be too bad. esp if you oc that cpu to 4.0. which is fairly easy to do. ( with appropriate cooler ) ( the memory may make it difficult though. ) I would think up to 20 fps lower than a current gen cpu. ( i'm still using an i7 930 at 4.4.. and everything is still very playable )