Point taken, but this system is operating at over 80% load capacity on the 12V rails ( they are rated 75A max on the Enermax Galaxy) sinve 3 280s require 59A on full load.
Corsair tx750 psu tier list install#
this way i keep my modular PSU ( since Corsair doesnt have a single 12V rail modular PSU above 620W) from the brand i choose ( yes, i am a Corsair's PSUs fanboy ) and install my 4870X2 without losing my sleep on safety and estability issues.Įven with all the math i am still waiting for anyone who dares to put 3 280s on a single 1000w Corsair, or any 2x500w PSU for that matter! Even if you go for 80% load numbers there is no sub 1200w in market that can provide so much power on the 12V rails alone, so it is no surprise that kIngpIn couldnt run the TRI SLI 280s with the 1200w Silverstone PSU, the single rail desing notwithstandingĪnd these numbers from Corsair Mike also confirm that my decision to keep my HX620w on the rig are correct, since i can simply put a 450w Thermaltake graphics PSU in a casebay and get 30A on the 12V rail spending just $70 should i ever need more 30A i will simply purchase another one. We are talking 1200w+ numbers here for the 12V alone. so in a two rail desing i would expect that one handle for two 280s and the other rail at least for the last 280 and the CPU+fans.
So using the 66% "sweet spot"for a 19,6A VGA the magic number is 30A for EACH 280 GTX on the 12V rail. I couldnt agree more: some sweetspot between the 50% efficiency mark and the 80% safety mark seems very reasonable.
They are most efficient, low fan noise, longer MTBF, etc etc in this range. Keep in mind most PSUs have a "sweet spot" and are best running at about 66% of their rated capacity. With an HX-520 that is about 1/2 of the 12v capacity there which does not leave a lot of headroom for the rest of the components. I heard from Nvidia that the power draw of a G-280 under load is 236w or, about 19.6 amperes. So i am yet to see a TRI SLI 280s setup using a single PSU no matter the rated watts, am i suposed to believe that a 2x500w PSU can run this system just because some Corsair rep said so? Explain to me like i was five years old.īut as i said i value the Corsairs reps opinions very much and will use careful reasoning here, let's go back to Corsair Mike at , the ASUS Ares CG6155, one of the few factory TRI SLi 280s systems so far, it uses 2000w in a dual power desing(2x1000w PSUs). Two power supplies with 2,2kW of power is something that you apparently must have if you're bent on extreme overclocking" (in)famous overcloker used " SILVERSTONE 1200W + CORSAIR HX1000W for power. I will list a few PSU config s of know TRI SLi reviews with 280s: The link shows many posts of someone named Corsair Mike who claims to be " Corsair Tech Support, If You Need Help, Just Ask." I have received help and information on HardForum from other person with similar claims, and it is always great to count with the direct opinion of Corsair BUT i am still asking for FACTS. just to avoid flaming i would ask for FACTS: has anyone put 3 280s on a corsair 1000w? I am the happy owner of a HX620 Corsair, but in good faith i can not advice someone to put 3 280 s on a Corsair 1000w. What we ended up doing is running one GTX 280 off the Corsair HX 620 PSU while the 1000 Watt took care of the other two cards and the rest of the system."Įven if the Corsair 1000w could in theory run Tri SLI 280s ( and i don't see how 3 280 s AND a high end C2D can be put on 2x 500w rails AND keep loads at 80% on each rail for future proof operation, there simply not enough 12v juice on a 500w rail to run these 2 or 3 of these beasts ) my point was that on PSU matters better be safe than sorry, and since modular graphics PSU from Thermaltake are cheap and provide ALL THE RATED WATTS ON THE 12v LINES there is no reason to dump $260+ on a 2x500w unit when for the same money i can buy ANY combination of 2 PSUs and put them on a huge case. During the Canyon test on 3DMark06, the system would just shut down! - Since this would seem to resemble a power problem, it was time to pull out a HX 620 Watt and do a bit of ghetto modding to get the two power supplies working together. When we started testing our Tri SLI setup with a 1000 Watt Zalman PSU, we ran into some problems. " Before we get into it though, we have to laugh at our power supply situation. I google "tri sli power 280 GTX " and the very first result is:
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