Tom's Hardware > Forum > Homebuilt Systems > General Homebuilt > How much power do I really need??
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strenner   02-13-2006 at 09:13:19 AM

I'm building a custom PC.. pretty basic, mobo will be a nice biostar nforce sli.. geforce 7800 gs, 2 gb corsair ram, and a standard 250 gb seagate w/ a AMD Manchester 4000+ cpu. I want to get the Antec Sonata Piano Black case from newegg, and it comes with a 450 watt power supply. Is this adequate for power? Or do I need to get a seperate powersupply? I do not plan on overclocking.. and in the future I MAY go SLI with a 2nd video card, but probably not.. SLI mode aside, will 450 cut it? Thanks.

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chuckshissle   02-13-2006 at 09:18:27 AM
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With the single 7800 GT card the 450 watt power should handle it no problem. One of my computer that sports and intel and 7800 GT with 350 watt power is running fine. But if your system change to an SLI then you would definitely be looking into 550-600 watt psu.

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unreal_nl   02-13-2006 at 12:04:08 PM
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Your always better with buying 600+ watt.. So you can upgrade with out energy problems in the future. Also makes your system more stable.

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madtatanka   02-13-2006 at 03:40:50 PM
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If you plan to go SLI in the future, you defintly will have to got a minimum 550 Watt PSU

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purelithium   02-13-2006 at 04:39:44 PM
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Quote :

I'm building a custom PC.. pretty basic, mobo will be a nice biostar nforce sli.. geforce 7800 gs, 2 gb corsair ram, and a standard 250 gb seagate w/ a AMD Manchester 4000+ cpu. I want to get the Antec Sonata Piano Black case from newegg, and it comes with a 450 watt power supply. Is this adequate for power? Or do I need to get a seperate powersupply? I do not plan on overclocking.. and in the future I MAY go SLI with a 2nd video card, but probably not.. SLI mode aside, will 450 cut it? Thanks.




If you're going all out on everything else, why are you cheaping out on the Motherboard? Biostar is not a good manufacturer.

Go DFI, Epox, etc.

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SuperFly03   02-13-2006 at 05:15:39 PM
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It honestly depends on the rail raitings whether or not the PSU is enough for your specs. I would GUESS that since its an Antec case that the PSU would be OK, but in my experience PSU's that come with a case are underrated on the proc rail. other people know more than I do and can explain it better, I have just heard of several burnouts because the PSU couldn't hack it, so be careful.

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Luminaris   02-13-2006 at 05:30:21 PM
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The new T series Biostar boards are rated pretty high. They're not so bad anymore IMO.

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judey   02-14-2006 at 12:22:50 PM
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I've got a setup with 2 raptor drives, 2 GB RAM, 7800GT, 3500+ with a 420W PS. Check the 12v rail max amps, if it's less that 20A, get a different powersupply. Mine puts out 29A (dual 12V 14A + 15A)And yes, it's entirely possible altough your powersupply says 30W more than mine that it puts out less amps on the 12V rail.

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