5830 do i need a 500w for a single computer?  tools_462 is running three of them on a 600w Seasonic.

oh one more thing how many watts do i need for a single computer with one gpu?  i have three old dell desktop that i want to mine with. what are the cheapest psu that I could run 24/7?

thanks for the replies.  is this ENERMAX NAXN ENP550AWT 550W ATX12V Active PFC Power Supply good enough for two 5830s? how do you tell the 20%, 50%, or 100% load? would it be cheaper to buy one or two for 4 5830's? if I buy one can i rig it between two computers?  thanks in advance

After my third psu died on me,  I think I need a better psu.
any suggestions? looking for something around $40-$60.

I don't want to spend too much though. should have just bought a really good one at the start but i have this generic 300w one that's for a powercolor 6950 and it has been running nonstop for over a month so I thought it would be fine.

The three I bought were 500w for a single sapphire 5830. All three stopped working. The worst one lasted a day before quitting on me.  This one 5830 is costing me so much now.  Is 500w not enough or is it just the brand?

Wow $250 for five cards that how much i thought it should be. can you post the parts? That would be $30 less for each pci-e.  I didn't know about the pci-e extenders where do you put the cards?

hmm.. the lowest I can can find is about $410 which is $82 per pci-e

Just curious to see what people are paying for each of the pcie slots?
On my main computer that would be $750 each but its my 7 year old and I payed $1500 for it then.
My others are about $80.  Seems really high to me but I wonder what others are paying for each and how they getting it so low? And Why are some people paying way more?  I don't see how people buying 6990 for $750 and then adding $150 cost for each slot and still see that as economical. $900 for ~700 Mhash when I pay $380 for ~600 MHash and I still think that's I'm overpaying.