[ubuntu] Sweet spot performance/energy use/price

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http://ubuntuforums.org – Lots of stuff out there on performance/price, some stuff out there on energy use, but not as much looking at performance/energy/price use. So I'm looking to build a desktop that shows some nice performance increases over my previous machine (4 year old athlon 2 gig or so, video upgrade to nvidia 7600 a few years back). My usage is desktop 90% of the time, but I like to play some enemy territory, quake wars etc. No need for crazy video capabilities, but I like my frame rates high. On the other hand, I'd like to minimize power use in this machine. So I'm looking at $170 AMD Phenom II X4 945 Deneb 3.0GHz Socket AM3 95W Quad-Core Processor $80 ASUS M4A77TD Pro AM3 AMD 770 ATX AMD Motherboard $95 PNY XLR8 VCG98GTEE5XEB GeForce 9800 GT EE 512MB 256-bit GDDR3 PCI Express 2.0 x16 HDCP Ready SLI Supported Video Card $85 G.SKILL 4GB (2 x 2GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Dual Channel Kit Desktop Memory Model F3-12800CL9D-4GBNQ I'm looking at processor and video pulling 150 watts, throw in a couple of hard drives for another 40 watts and memory and mobo at maybe 50, and I'm hoping that this will be pulling a total of under 300 watts. (I could drop another 30 watts with a lower power quad core (65 watts)). So questions I have: 1) Can I get by with a 380 watt psu, or should I go for something int 450-500 range? (I'm looking for at least an energy-80 bronze i think. 2) are the low power versions of the video and cpu really worth it? Or am I just fooling myself that I need a phenom quad + 9800gt, when cheaper less demanding hardware might pull the same power at a lower cost. 3) Any worries about compatibility I'm missing--I don't see anything, but hoping that if anyone's had bad experiences with something here, they'll chime in. I'm planning to use 9.10 64 bit. (Hardware)