added a hyper 212 cooler and crucial m4 120 gig when it dropped below $100
so i have been helping answer questions on the forum and i have noticed quite a few issues with amperage and new cards and especially SLI. what is the most graphics power this machine could still push. Some of these 2 day sale components were not what I went to pick up but the prices were good at the time. the antec said high capacity gamer on it and I just went with it without doing much research beforehand since I already had another one picked out. The excitement of a new build made me do it. I think I would be okay but power/amps and graphics cards are not my specialty.
If that Antec PSU is at all accurate on its ratings you have plenty of head room to go SLI. You would have to be seriously pushing your overclock limits on both CPU and GPU with a nice liquid system to get to the point where 750W won't cut it. If you were at 500W I would have second thoughts, but 750 is a lot of juice.
Just make sure you have enough cooling. Things get pretty toasty with 2 GPUs.
CPU voltage is powered from the 12V supply too, so that 62.5A figure has to cover that as well as graphics.
A reasonable figure for your current system would be at most somewhere around 300W of 12V, or 25A.
As for what stuff gets what rail, it really depends on the PSU. Yours is distributed like this-
12V1 - Main motherboard, sata, peripheral
12V2 - ATX12V/ETX12V
12V3 - PCIe cables
12V4 - PCIe cables
Some of those are clearly never going to pull 40A, not in a million years.
so what you are saying is by the specs I have roughly 450 watts left to use, plus another 100 watts when I switch out the graphics cards.
does anybody know roughly what the increased risk of damage is when you go above spec'd demands. In other words this power supply seems to run stable up to 1,000 watts. Is it completely foolish to push these limits
below is a quick link to the overload tests http://prntscr.com/u91qo
thanks for that info ko888. with your assistance and reading your other posts I really am getting a better grasp on power supplies and I hope to further educate users about the fallacy of judging power supplies by watts and bronze, silver, gold status.
also hardware secrets had some very nice articles to read on what all the protections mean(shunts and OCP and OTP) and other technical power supply knowledge.