Read it. I don't even need to comment on that.
1. Don't say something like "MACS R00L YOU!" OR "PC ARE TEH KING". That just makes you ignorant.
2. There is a huge difference between a fast PC and a slow PC when you are using it for stuff other than solitaire and web browsing. When you are playing games, compiling, encoding, doing graphics work, drafting, rendering, etc, there is a noticable difference between your average Dell and a custom built workstation or gaming rig.
3. Right now, I consider a fast PC to be an Althon XP at 2.0 ghz or more, any Athlon 64, a Pentium 4 at 2.4 ghz or more, with 512mb or more of pc2700 or faster, and at least an fx5200 or a radeon 9200. That would be the bottom of "fast computers" for me, and it happens to be the minimum recommended specs to run FarCry.