Re: what kind of ram
I have no idea of the guys motherboard, or yours for that matter, I don't really have the info to be giving suggestions like that.
If your mate wants RAM, and you now know which is the compatible type, I advise him to buy it new from a shop so theres 100% compatibility.
My Setup -
AMD 64 3200 +, 256 mb Geforce 6600, 1GB PC3200 DDR400 RAM, 160GB SATA 7200RPM HDD