The Celeron is a a lower binned processor - I'm already stating what you already know, but I can only imagine the CPU being the bottleneck for your friend.

Regardless, it'll play the game OK, but the game's gonna look like crap. And be sure to remind your friend not to have too many other things running because I'm pretty sure the game is going to tax the crap out of your CPU and GPU.

Also, where's the punctuation man?