Get demo from here: http://quakefour.net/ql/four.dm_73

1) Put it in your demo folder
2) Join Devmap or disconnect from a server
3) Drop the console and:
/timedemo
/demo four
6) after it runs, drop the console and you will see your average FPS.
7) Post results below (if you have Q3 installed, post the timedemo from that aswell - to compare).

Gogogo