Games based on the Quake 3 engine are SMP enabled. They use both processors VERY well. RTCW is the same. I'm not sure know about WC3.
How can you tell?
In the game, bring down the console and enter the command:
/seta r_smp "0"
That will disable multiprocessor support. You'll have to relaunch the game for the change to take effect. Now, run a timedemo or play a game and note the framerate. If you don't already have the framerate counter on, enter this command:
/seta cg_drawfps "1"
When you've got an impression of how the speed is, enter this command to enable SMP support:
/seta r_smp "1"
Again, relaunch the game and play. On my Mac, I get nearly DOUBLE the framerates. Clearly the processor is the bottleneck with these types of games (at least, on my dual 500 it is).
RTCW seems to ignore the r_smp switch.
This is unfortunate because in the demo and early betas, switching on SMP provided a significant boost in speed. There were bugs with navigating the menus when smp was on, though, but I would have thought that could be simple fix rather than crippling performance of the whole game to one processor. *sigh*
[ 08-28-2002: Message edited by: Brad ]</p>