GTX 580 SLI, 850w or 1050w, better choice?


I am building a new PC with a GTX 580, with another 580 added in the future.

I have read all the similar posts I could find, but it was someone looking for the cheapest solution. I am looking for the best solution.

I am torn between these two PSU's. One is 850w the other is 1050w. Based on reviews I would like to stick with Corsair. I would use Seasonic if they had a modular option.

CORSAIR Professional Series HX850 (CMPSU-850HX) 850W ATX12V 2.3 / EPS12V 2.91 80 PLUS SILVER Certified Modular Active PFC Power Supply

CORSAIR Professional Series HX1050 1050W ATX12V / EPS12V SLI Ready CrossFire Ready 80 PLUS SILVER Certified Modular Power Supply

Tom's used a 850w Seasonic PSU to power a 580 SLI rig w/ overclocking in System Builder Marathon, Sept. 2011: $2000 Performance PC. My new PC will be almost the same setup.

On the other end, I've come across some people saying that 850w for 580 SLI is "cutting it close". I don't want to add a sound card or something in the future and exceed the power limits.

I don't plan on overclocking immediately. I will after a few years when it starts to show it's age or just upgrade. I just want to be prepared in case the need arises.

I am leaning towards 850w being sufficient but I'd rather have "a little more" than "just enough". Going from 850w to 1050w with Corsair is a rather large leap though.

My build:

Case: COOLER MASTER HAF 922 RC-922M-KKN1-GP Black Steel + Plastic and Mesh Bezel ATX Mid Tower Computer Case

CPU: Intel Core i7-2600K Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) 4 x 256KB L2 Cache 8MB L3 Cache LGA 1155 95W Quad-Core Desktop Processor BX80623I72600K

Heatsink: COOLER MASTER Hyper 212 EVO RR-212E-20PK-R1 Continuous Direct Contact 120mm Sleeve CPU Cooler Compatible with latest Intel 1366/1155 and AMD FM1/AM3+

Mobo: ASRock Z68 Extreme7 Gen3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

GPU: EVGA 015-P3-1580-AR GeForce GTX 580 (Fermi) 1536MB 384-bit GDDR5 PCI Express 2.0 x16 HDCP Ready SLI Support Video Card

Memory: G.SKILL Sniper 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBSR

SSD: Crucial M4 CT128M4SSD2 2.5" 128GB SATA III MLC Internal Solid State Drive (SSD)

HDD: Seagate Barracuda ST31000524AS 1TB 7200 RPM 32MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive -Bare Drive

I welcome all opinions,

12 answers Last reply
More about 850w 1050w choice
  1. According to this: 850W isn't enough for your specs. I'd go for a 950W or 1050W.
  2. Recommended CPU

    Get the 850Watts PSU since you don have a 130w CPU, I think your Computer will use around 750w...

    EDIT: Get this PSU:
  3. pckitty4427 said:
    According to this: 850W isn't enough for your specs. I'd go for a 950W or 1050W.

    That does not mean that 850w is not enough... trust me....
  4. If you dont plan on adding another GTX 580 then the 850 will be plenty and really even if you added a second card as long as you dont heavily overclock the system, and even if you do then 850 should be plenty. But the extra 30 dollars after the mail in rebate, would be well spent for the 1050 for future upgrades. Both would suffice but I would personally go with the 1050.
  5. About 580 SLI power consumption from Guru3d:
    System in IDLE = 237W
    System Wattage with GPUs in FULL Stress = 719W
    Difference (GPU load) = 482W
    Add average IDLE wattage ~ 20W x2
    Subjective obtained GPU power consumption = ~ 522 Watts
  6. Quote:
    I am leaning towards 850w being sufficient but I'd rather have "a little more" than "just enough". Going from 850w to 1050w with Corsair is a rather large leap though.

    I wouldn't ...... Look here....ya won't find a single 850 watt PSU on nVidia's certified PSU list for twin 580's

    The two HX series PSU's have drastically different performance ratings at jonnyguru...I wouldn't go under a 9.5 rating.

    HX850 (10.0 performance rating)
    XH1050 (8.5 performance rating)

    Since ya case is rather old design, w/ no front USB 3 ports, might I suggest this alternative:

    $150 Antec CP-1000 (9.5 Performance rating)

    $150 Antec 1200V3 or DF-85

    Both fit the CPX form factor CP-1000 and the pairing works extremely well together for low noise, excellent cooling.

    "Modular" is a useless buzzword. What is the sense in "modularizing" every single cable ? Can you build a box w/o the 24 in cable ? Then why introduce a connector which is a potential failure point ? Hybrid modular combines the best of both worlds with hard wiring of the absolutely necessary cables and modular cables for the "optional" ones.,8016.html

    HD - Might I suggest two 750 GB ones for 50% more storage for same price

    CPU - I'd suggest the 2500k fpr the $100 savings.....unless you need hyperthreading for video editing, CAD or some other work station level app, the 2500k will give you identical performance in gaming and run about 7C cooler.

    MoBo - Take that money and invest in a MoBo manufacturer that offers more than a 2 year warranty. And if ya think ya need Z68 (I don't see it), you might as well get GEN3

    RAM - I'd suggest the Vengeance

    CAS 9 1.50 V
    CAS 8 1.35 V

    Even for the most conservative, I would suggest OC'ing from the get go.....OC'ing has gone from something Intel winced about to something they actively encourage and have made it an integral part of their marketing strategy. A moderate 4.5 GHz OC on a 2500k will barely warm it up.
  7. 900 to 950w psu should be fine
    Best database on the net with psus

    Doesnt those gpus come with a current limiter?

    PC Power and Cooling Silencer Mk II 950W High Performance 80PLUS Silver
    $129.99 after mail-in rebate card
  8. The calculators, formulas, reviews and recommendations are all over the place.

    Minimums range from 750 watts all the way to 1000w. Maybe someone who is actually rocking 580 SLI with similar hardware can chime in?

    Thanks everyone.

    And, I don't know if they have current limiters or now.
  9. Actually the silencer noted above looks like a pretty sweet deal.
  10. Thanks for trying to help but, I'm not looking for a sweet deal.

    I am looking for the best solution given the products I listed above.

    I think most of you guys should read my original question if you would like to help.

    Thank you.
  11. From's review of NVIDIA GeForce GTX 580 SLI the following power consumption graphs are for the graphics card only:

    Idle: Windows Vista Aero sitting at the desktop (1280x1024 32-bit) all windows closed, drivers installed. Card left to warm up in idle until power draw is stable.

    Average: 3DMark03 Nature at 1280x1024, 6xAA, 16xAF. This results in the highest power consumption. Average of all readings (12 per second) while the test was rendering (no title screen).

    Peak: 3DMark03 Nature at 1280x1024, 6xAA, 16xAF. Highest single reading during the test.

    Maximum: Furmark Stability Test at 1280x1024, 0xAA. This results in a very high non-game power consumption that can typically be reached only with stress testing applications. Card left running stress test until power draw converged to a stable value.

    To handle the worse case power consumption scenario (i.e. Maximum Card Power (w/o limiter) of 627 Watts), NVIDIA recommends that the power supply have a minimum combined +12 Volt continuous current rating of 62 Amps or greater and with at least two 6-pin and two 8-pin PCI Express Supplementary Power Connectors.

    It is the power supply's minimum combined +12 Volt continuous current rating specification that is the most critical requirement that must be met not its wattage.

    The Corsair Professional Series HX850W PSU, that the OP linked to, with its minimum +12 Volt continuous current rating of 70 Amps meets the requirement.

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