That is wierd usually Red Hat OS's install an SMP kernel on initial install. I know all of the version 7 flavours did. What kind of processors and motherboard?
I would try 8 on my RH7.1 SMP box. but i cannot have any downtime.
Check your bootloader too usually it would say SMP in the description of the OS you are loading. or you can goto console and type in "top" without the quotes. If it says CPU0 and CPU1 you would know if it is using SMP.
as for the frame rates, did you upgrade your video drivers? I havent even tried any games in linux so i dont know what kind of frame rates you should see anyways.