First of all get him to read all this thread - it might take a week!
FSX is all about CPU power so if he can get something like an i5 overclocked to at least 4GHz then that would be a good start. There are many tips and tweaks listed in this thread which can be used to get better performance on FSX.
I'm assuming he already has purchased Flight Sim X?
On another note it looks like Rex Essential Plus/Overdrive has been released!
FSX is all about CPU power so if he can get something like an i5 overclocked to at least 4GHz then that would be a good start. There are many tips and tweaks listed in this thread which can be used to get better performance on FSX.
I'm assuming he already has purchased Flight Sim X?
On another note it looks like Rex Essential Plus/Overdrive has been released!