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Originally Posted by richardphat
Well cpu 2,6 gHz dual core
Nvidia 6150 Le+ (256 mb)
Psu 300 watt( thats why i cannot buy a new graphic card)
2x1024 ramm minus 128 for internal graphic card
Support Pixel shader 2.0 but it sucks!
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Power consumption depends on many things, such as CPU, Mem clock, graphics, number of HDDs (type: e.g. A WD SATA II Raptor 10,000rpm will drain more juice than a Seagate Sata I), raid configuration, sound card (e.g. XiFi Fatality Champoin Platinum series PCI express) draws much more than the previous XiFi Fatality PCI versions and a LOT more than integrated sound cards.
Contrary to the 'mainstream' gossip, overclocking does not increase the power consumption so much, because higher settings (>> than 150% performance for example) does produce so much heat (esp for AMD which still uses 65nm techology even in its Phenom quad cores) that you'd need water cooling to prevent it from burning.
So if you plan to upgrade to a config like: quad core (2.6-3.6 Ghz), fast DDR3 (1066-1666Mhz), ATI 4870 X2 (2GB), XiFi Champion Platinum PCI-E and WD Raptors x2 raid 0, you'd need close to 900W to keep it stable in a case with more than 4 fans. But if you add another monster 4870X2, you'd have to jump straight into 1200w just to be sure.
If you want to keep your 2,6 Ghz dual core and have a decent ATI 3870, I'd still reccomend getting a 400w PSU (you can get them these days for 100-120 bucks even from thermaltake - mainly because there's demand on the market for >600W+ PSUs.
Always have a bit more more wattage than required than less, it will make your system more stable.