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Need advice on PSU PLEASE

Hi, I'm building a gaming rig and want to make sure I'm getting something that won't fry my system and will power it steadily for years to come. Is it true that you should ideally stay under 80% load even when running all out with fans and all the other good stuff going close to 100%? Am I worrying about nothing? I think I will eventually crossfire 2 7970's down the road so I'd like to be able to power that setup with this PSU. Thank you so much for helping me out!!!

PSUs -
1)SeaSonic Platinum-1000 1000W ATX12V / EPS12V 80 PLUS PLATINUM Certified Modular Power Supply $260 & 7yr warranty
2)SeaSonic X750 Gold 750W ATX12V V2.3/EPS 12V V2.91 SLI Ready 80 PLUS GOLD Certified Modular Active PFC Power Supply $160 & 5yr warranty
or 3)PC Power and Cooling Silencer Mk II 750W High Performance 80PLUS Silver SLI CrossFire ready Power Supply $130 & 7yr warranty - I would prefer an 80PLUS gold or platinum for long term usage and usually higher build quality it seems and I usually don't turn off my PC too often, so thats why I'm so uncertain of what I should actually need. I would gladly disreguard all of these if someone could point me to a PSU that should last for years and ideally power anything I throw at it.

CPU - Intel Core i5-2500K Sandy Bridge 3.3GHz (3.7GHz Turbo Boost) LGA 1155 95W Quad-Core Desktop Processor Intel HD Graphics 3000 BX80623I52500K

Mobo - ASRock Z68 PROFESSIONAL GEN3 LGA 1155 Intel Z68 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard

Cases - Antec Three Hundred Illusion Black Steel ATX Mid Tower Computer Case or
Rosewill FUTURE Gaming ATX Mid Tower Computer Case, come with Four Fans - 2 x Front Blue LED 120mm Fan, 1x Top 120mm Fan,1x Rear 120mm Fan, Support up to 6 Fans

Memory - G.SKILL Sniper Low Voltage Series 8GB (2 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory Model F3-12800CL9D-8GBSR2

GPU - XFX Black Edition FX-797A-TDBC Radeon HD 7970 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card

Cooler - COOLER MASTER Hyper 212 EVO RR-212E-20PK-R2 Continuous Direct Contact 120mm Sleeve CPU Cooler Compatible with latest Intel 1366/1155 and AMD FM1/AM3+

SSD of some kind
5 answers Last reply Best Answer
More about need advice please
  1. For the money I would go for the Seasonic (either is good enough) and stay away from lesser brands. Choosing a budget brand often ends up costing you more in the long run.

    After building my first PC years ago and did what many people do, by saving a few pounds / dollars on the PSU - I learnt the hardway.... I always go for Corsair these days
  2. Best answer
    For a system using two Radeon HD 7970 graphics cards in 2-way CrossFireX mode AMD specifies a minimum of an 750 Watt or greater power supply. The power supply should also have a combined +12 Volt continuous current rating of 57 Amps or greater and have at least two 6-pin and two 8-pin PCI Express supplementary power connectors.

    If you're planning on doing any overclocking of the CPU or GPU I would recommend a minimum of a 850 Watt power supply from a reputable name brand.

    Seasonic Platinum Series 860W (SS-860XP)
    • +12 Volt continuous current rating of 71 Amps
    • four (6+2)-pin PCI Express supplementary power connectors
    • 7 year warranty

    Seasonic X-Series 850W (SS-850KM)
    • +12 Volt continuous current rating of 70 Amps
    • four (6+2)-pin PCI Express supplementary power connectors
    • 5 year warranty
    • 80 PLUS GOLD

    Corsair Professional Series HX850W (CMPSU-850HX)
    • +12 Volt continuous current rating of 70 Amps
    • six (6+2)-pin PCI Express supplementary power connectors
    • 7 year warranty
    • 80 PLUS SILVER (Actually 80 PLUS GOLD certified but intentionally downgraded to SILVER by Corsair)
  3. A 7970 or two in an Antec 300 = don't know if that's a good idea = won't fit so well
    Might want to stretch your case budget ..
    Corsair Professional HX850W
  4. Best answer selected by uber415.
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