ColMirage :
If you play a lot of SupCom, then the Quad is the way to go. SupCom loves Quads.
It all chokes up anyway when the Commander goes BOOM! Yes, there is a performance gain from having the quad-core, but it probably won't get noticed between these 2 CPUs.
Adding more RAM to his configuration may not help much in the end. True, if the rig were running Dual-Channel, there would be performance increases. However, 8GB is a bit towards the overkill side of things. Most systems (read:
gaming rig) run fine on 4GB. The only way there'd be a boost would be to swap the single stick for 2 2's and run it dual channel. Not worth it.
Like adding a spoiler to a Geo Metro. Unless the rest of the system is bottlenecking because there's not enough RAM (highly unlikely in this case), adding to it won't help. It'll make it look cooler and make you think you've got bragging rights until everyone realizes there's no point in it being there.
Stick with the E8400. It'll perform better in a greater majority of games, both out now and upcoming titles. Just remember, system requirements for Starcraft 2 just came out.
http://www.shacknews.com/onearticle.x/62411 damn good game to be sure, only requires a single core (though, WoW has been patched to utilize dual-core).
FSB, L2 cache, and stock speed are you friends in your case. Throwing 2 extra cores at it won't make a night/day difference.
Refer to the last SBM. Better yet go
here and check out the performance of the E8400 and GTX 260 (on par with the HD5770, check the
chart). I know, the article even says (World in Conflict) is CPU limited. But the quad-core that's beating out the E8400 costs almost $100 more. You'll see similar frame rates between the E8400 and Q8300, with the E8400 more than likely maintaining a slight lead.
Go with the E8400 for the sake of any other games you'll be enjoying.