i have no idea
i've been an intel guy for a long time, so i'm not sure what amd performance is like now.
the latest phenoms are supposed to be around the q9000's i believe, but behind the i7's.
if i had to guess, i'd say they were 6-7 out of 10? with a 4870 or 250/260
with a 5870 or 285 you could be looking at maybe an 8 with them?
if he's looking at gaming, a good graphics card would always bring the score up, most modern cpu's are fairly decent, its the gpus that make the most difference now.
bear in mind that 6-7 is still very good, where anything below would be dual core, 9800gt etc etc, some decent mid range stuff.