I'm trying to build myself an ultra nice gamer machine... mainly used for MMORPG's... for under 1000 dollars. I'll be using a 45 dollar Cooler Master case and it needs a power supply. I'm going to be running an AMD 4200+ Dual Core Processor, ATI Radeon 1950 GT 512mb, 2GB Ram, etc. So it needs to be something big... I was thinking 450w or bigger. The thing is... I was hoping to make it SLi ready so down the road when Christmas comes I can ask for another Radeon 1950GT and hook them together for an unbeatable experience... at least compared to the 1GHZ Dell I'm writing to you from, now. Do I really need to get an 'SLi Compatable' power supply? If I do, I probably wont even bother spending 120 bucks on a Lanparty SLi compatable mobo... So.... do I really need that?