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How do I read power supply specs?

N

nedney

Member
I'm going to build a SFF box soon, and I'm gonna get the Ultra Microfly for the case, but I don't know if I should get the PSU included, or by one separately. There's a table with the specs for it at SFFClub, but I have no idea how to read it. Would that PSU be enough to power a Abit Fatal1ty F-I90HD, an Intel E6600, 2 hard drives, probably one optical, and a 8800 GTS?
 
Originally posted by: nedney
I'm going to build a SFF box soon, and I'm gonna get the Ultra Microfly for the case, but I don't know if I should get the PSU included, or by one separately. There's a table with the specs for it at SFFClub, but I have no idea how to read it. Would that PSU be enough to power a Abit Fatal1ty F-I90HD, an Intel E6600, 2 hard drives, probably one optical, and a 8800 GTS?
Click to expand...

Google will lead you...also http://www.jonnyguru.com or even the SPCR sdite will tell you....

I usually read the specs with my eyes opened...
 
I think you get more PSU with the currently shipping microFly. Most would like to see around 30A available on the +12 rails - particularly with the vid card you chose - you might want to reconsider that choice as it takes two slot spaces which you might regret later - only 4 card slots to mess with on a microATX box. The Ultra PSUs aren't great but much better than the Ultra modular junk box the brand started out with. I went and looked and it is still the 400W unit. Unfortunately the only color that is usually available w/o PSU is black.

.bh.
 
Ok, well, an Nvidia 680i motherboard, 8800GTS, 2GB RAM, and a E6600 will need about 225W's of power. Add in watts for your hard drives and optical, plus case fans....

A Seagete 320GB 7200.10 needs about 13W each. And estimate 20W for a 18x DVD burner. So that means you need about a 300-350W power supply assuming you get the power on the correct rails. The disks and burning will need most of their power on the 12V rail, meaning about 3.5A just for the disks and optical on the 12V rail (Watts = Volts * Amps..... Amps = Watts/Volts).

The 8800GTS will need about 150-180W on the 12V rail, meaning 12.5-15A.... which combined with your already 3.5A puts us up to 18.5A or so.

We have not even begun to talk about the motherboard, CPU, and RAM, and we are down to about 1.5A on the 12V rail with the stock powersupply. While the RAM will be using the 3.3V rail and most of the motherboard and CPU will be 5V and 3.3V, there will be some 12V draw for the CPU. I don't think that powersupply will cut it personally.
 
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