My new Extreme PC build - Do i really need 1K PSU?

Hello, I've calculated my PSU usage thourgh here and it says that I my built will ned 950 W PSU.

My built will be:

Mobo: GIGABYTE GA-X58A-UD9 LGA 1366 Intel X58 SATA 6Gb/s USB 3.0 XL ATX Intel Motherboard

GPU: GeForce GTX 480 SLI

CPU: Intel Core i7-930

Heatsink: Corsair H50

SSD OS: 60GB OCZ Technology Vertex 2E

RAM: 2x G.Skill Trident 6GB (3x2GB) DDR3 PC3-16000C9 2000MHz

HDD: 7x Western Digital 1.5TB

Blu-ray: Pioneer Black Blu-ray Disc/DVD/CD Writer SATA Model

Lightscribe: PLEXTOR 24X DVD/CD Writer Black SATA Model PX-880SA LightScribe Support

OS: Microsoft Windows 7 Ultimate 64-bit

Case: Thermaltake Xaser III which has 5 fans

I'm going for a NanoPoint Tagan PipeRock II series which comes to 500W, 600W, 800W, 900W and 1100W. I haven't heard anyone talking about Tagan, probably because Newegg isn't selling it but it's the one im using now and I'm really happy with it and its probably the most easy-to-use PSU i've seen.
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  1. YES!!! From my past experience, the more-the better!anyway, your rig will need it. i would recommend the 1100w, so future overclocking wont be a problem.
  2. I've heard rumours that ive over do it with the psu aint so good :o What UPS shall I go for? im looking for something that in case the electricity goes off I will have few minutes to turn it of... Anything familir that will handle a 1100 W PSU
  3. No, your system ABSOLUTELY WILL NOT consume 1000W. A similar build with GTX 470's consumes 550W AT PEAK LOAD from the power supply (input power times 0.8).

    http://www.tomshardware.com/reviews/overclock-cpu-gpu,2643-14.html

    Your system will likely draw around 80W more at peak load. That's 630W. Allowing for "unseen circumstances" a 750W power supply would output enough power to cover your needs. But you should add a "safety factor" to prevent premature aging of the power supply's capacitors due to heat, so I'd suggest a TOP QUALITY 850W unit at a minimum.
  4. Crashman said:
    No, your system ABSOLUTELY WILL NOT consume 1000W. A similar build with GTX 470's consumes 550W AT PEAK LOAD from the power supply (input power times 0.8).

    http://www.tomshardware.com/reviews/overclock-cpu-gpu,2643-14.html

    Your system will likely draw around 80W more at peak load. That's 630W. Allowing for "unseen circumstances" a 750W power supply would output enough power to cover your needs. But you should add a "safety factor" to prevent premature aging of the power supply's capacitors due to heat, so I'd suggest a TOP QUALITY 850W unit at a minimum.


    7 hard drives, two GTX 480's in SLI and an i7 930 (overclocked most probably) drawing just 630 watts is highly improbable..
  5. Emperus said:
    7 hard drives, two GTX 480's in SLI and an i7 930 (overclocked most probably) drawing just 630 watts is highly improbable..
    You're right, I missed his 7 hard drives and estimated just for the bigger cards and extra fans. He's probably closer to 670W, and a high-quality 850W unit would still be enough.

    If he's OVERCLOCKING at 1.45V core he'll probably DRAW around 790W at peak load (100% CPU on eight threads and 100% GPU). In that case an 850W would only be good enough for a system that runs peak load occasionally, and he'd want 1000W.

    He didn't mention overclocking though.
  6. OK, having a look with the Outervision Extreme Calculator Lite I come out at 946W with some heavy overclocking:

    4GHz OC at 1.35V
    100% TDP
    100% Load

    with no overclocking and TDP and load at recommended levels (90%) I get 800W on the nose.

    This doesn't factor in the pump on the H50 (which I personally wouldn't use by the way) but I don't think it'd draw enough to throw these numbers off too far.


    So based on these numbers I'd personally feel more comfortable with a high-quality 1000W or 1200W PSU (the gold-rated Corsair Professionals look nice) as 50%-80% load is the efficiency sweet-spot apparently, but they do cost.


    http://extreme.outervision.com/psucalculatorlite.jsp if you want to have a play
  7. Thanks alot everyone. I'll probably go for the 1100W then in case I want to add or change something in the future... Anyone has any idea of a good UPS?
  8. Minimum PSU Wattage: 1197 W

    This is what I got from http://extreme.outervision.com/PSUEngine ....
  9. rallyboy said:
    Minimum PSU Wattage: 1197 W

    This is what I got from http://extreme.outervision.com/PSUEngine ....


    Right, that's what you get when you don't have real data on which to base your decision. I like OCZ's 1000W Gold power supply because of its high efficiency, confirmed by 80-Plus independent testing, and its moderate price. Lots of people are complaining about getting one with a noisy fan though (I've not had that problem).

    Corsair's 950W Silent Pro has a lot more fan for its low noise, and it's much cheaper. Of course, it's only 80-plus Bronze.

    Corsair's CMPSU-1000HX is highly awarded and cost more. I'd give one the nod except that I've actually killed these before.
  10. How can PSU calculators differ so much.!! I did the calculation from the PSU calculator at the antec site.. The results with a 3.6 GHz clock rate came upto 790 watts or so.. Now the reason i'd say a 850W PSU would not suffice is because It'll be mostly running at and over 80% of the load most of the time.. This looks like a gaming build with though i am not sure what are those 7 hard drives for.. Anyway, i recently studied the review for Corsair AX 1200 up at www.jonnyguru.com and it looks promising for such a build (if one can afford of course)..
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