Right now I am only boxing 2 toons but am looking at going to 4. Right now with 2 I run about 50ish fps on main and 45 on alt. But my ram sits at about 80% and cpu at around 60% usage. This is what I have for a system.

xps 410

Intel Core 2 Duo Processor E6600 (2.4GHz,1066FSB) with 4MB cache

2GB DDR2 SDRAM at 667MHz

250GB SATA II Hard Drive (7200RPM)

and a 3450 sb edition ati diamond video card

The questions are these one I'm looking at going to 4 g of ram is it worth it to buy 4 at 800mhz or just get 2 more at the 667? Since 800 is as big as I can put in my computer. Also I have a 22in wide screen and looking at adding another 17in monitor not sure if that is going to make a difference or not. Also was woundering if you guys think this system maybe able to handle 4 boxing if I up grade the ram. Thanks for any info you can give me!