As title says..I was just thinking about to add another GTX275 in near future
but when I looked at my HX620 lol, something tells me I need a better PSU
Since buying another HX750/850 will cost me another 200~300USD
So I'm thinking of using 4 molex pin and convert into 2 PCI-E power pin
Since HX620 has 2 PCI-E power pin and combine with the another 2 PCI-E power pin and that makes 4 PCI-E which is required for 2 GTX 275, and I gonna spread it like this, one GTX275 will get one direct from the PSU and one from 2 molex pin.
So...my specs are
3x1GB Kingston DDR3-1600
1 WD 640GB HDD
And I did some research from wiki, it says single GTX275 TDP is 219W and 2 of them makes 438W, but my PSU is rated at 620W
Adding my i7 takes up 130W and that makes 568W..
Just thinking is it enough for 2 GTX275 ?
If you look at Anandtech's review (link below), they have a total system power draw chart with SLI GTX280's needing 490 watts and SLI GTX260's needing almost 400 watts. Remember, that a complete system with a Core i7 965. Your GTX275's will fall somewhere between those two. Since Corsair makes a high quality unit, I'd say you are fine. http://www.anandtech.com/video/showdoc.aspx?i=3517&p=13
You may need to buy some molex -> 6pin PCI adapters since I'm not sure the HX620 has enough.
3 "virtual " 12v rails with no OCP, effectively making it a single rail unit with a max 12v output of up to 50 amps, of course this depends on the 3.3 and 5v load.
I'd upgrade just to have the proper connector's.
I would tell you to get something with more Rails with a Higher Amp. And He should get a 850w or higher PSU. Im using a 1000w and when I get my new PC i'll need a 1200W or higher for my setup. Its just about better now adays just to get the higher one with a higher AMP limit. Oh if you must get one with that come with 4 Rails for GPU's Thats what mine is setup for. I know your going to be using 2 GPUs but dont use the molex setup it takes that whole rail its on. You cant put anything on that rail but the GPU and if your using Molex put the converter as close to the PSU as you can.