I know it all about the amps on the 12v rail etc., but still. Used a calculator to estimate power requirements for a 295 in sli, 4 HDD, OC'd i7, et al, all running at 90%, with 95% tdp and it estimated I need 830W. Now I know if wont be good to push an 850w with that for a long time, but will it do? For example the Corsair 850, will it give consistent 850, cause that will do me fine. The other problem is that there is a coolermaster 1000W, but it has SIX (6) 12v rails. The problem is that a 295 will take about 300W, which a single rail wont be able to provide. Whats the solution, besides splurging and buying a really expensive PSU. Please help!
1) Gpus dont use near as much power as they say they do
2) As long as u use connectors based off different rails, 99% of the time ull be fine. Most PSUs just use a fake way to split the rails from 1 source. Something different is the HX 1000 cause its basically 2 PSUs in 1 so 2 rails
Thanks guys, I find that there is so little info about this on the net. I figured it out from a review on the coolermaster which had 6 rails. No one mentions that the set up of wires coming out of the PSU are designed so that the 6/8 pin pci-e connectors get the lion's share of the amperage. But I'm still confused by why there are massive PSU's when the most demanding set ups draw 150-200 watts less than required at full power? The most baffling are set ups when a guy will have a STANDARD machine, with a single card (i.e. single GPU, e.g. GTX280) and will be using a 1000W PSU. I understand that some of those guys must be preparing for future SLI/Xfire, but I don't believe that everyone is. Anyway, just to confirm - not that I am getting THAT one - but when a power calculator tells you that at peak you will need 830 Watts, it is doable to be using a good 850W PSU? thanks.
Silverion77 - I used this calculator - http://extreme.outervision.com/psucalculatorlite.jsp
Can't link the set up, but here it is.
Core i7 - 920 Oc'd to 3800MHZ @ 95% TDP
'High end' mobo
6 Dimms DDR3
3 Sata HDD
1 Blu ray drive
1 DVD drive
1 120mm fan
2 80mm fan
Thanks Silverion, but do you think that there is a risk in running at near those settings for a long time? I know that it is highly unlikely that I will blazing 3 HDDs, 2 optical drives and 2 GPUs all the time, but what is undesirable is to have a system fail on me, when 30 pounds extra would get me 1000 watts.
But more fundamentally, WHY do people buy crazy PSUs? Why do they even exist??? I mean, I can see how you can approach using 1000 watts, but never 1200/1300??!!!!