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Will 850W PSU Handle i7 OC and 2x Gtx 580?

Last response: in Components
June 17, 2012 12:47:22 AM

When I bought my gaming rig last year, I tried to buy the power supply with a worst case scenario in mind, something that would last me for a long time; that a few years down the road, when it can no longer run new games well, I could always run 2 cards in sli, maybe overclock the gpu/cpu/ram.

Lately I've been thinking about also upgrading the fans in the future and possibly watercooling as well. I just checked out Thermaltake's power supply calculator, and, according to them, it looks like I should have gotten a much higher wattage psu (about 1500 watts). Is that a reliable online calculator? I've heard that 750 Watts will run 2x GTX580s in sli, but I do have a lot of other paraphernalia and want to overclock.

Rather than spend hours in front of a calculator to verify this, I was hoping you guys could give me some opinions based on experience.

My PSU is a Seasonic SS-850HT 850W ATX12V

Here's similar specs of what I want to upgrade to eventually:

Case: Fractal Design R3 (Mid Tower)

Fans: 10 fans:

x6 Scythe DFS123812-3000 "ULTRA KAZE" (or similar, im open to suggestion. 3 for the case, 3 for a radiator)

x4 Scythe Slip Stream Kaze Maru2 140 or Xigmatech XAF series (or similar, i'm open to suggestion)

Motherboard: ASRock Z68 Extreme4

CPU: i7 2600k (LGA 1155. 95 watt. probably try to overclock it to around 4.5 ghz at some point)

HDD: 2x Western Digital Caviar Black WD1002FAEX 1TB 7200 RPM SATA 6.0Gb/s (I'm leery of SSDs and their degradation over time)

GPU: 2x EVGA 03G-P3-1584-AR GeForce GTX 580 (Fermi) 3GB *Overclocked

RAM: 4x GSkill Ripjaws X Series 4GB (DDR3 1600MHz PC3-12800 240-Pin Desktop Memory Model F3-12800CL8D-8GBXM) *Overclocked maybe

OS: Windows 7 Home Premium

Other Paraphernalia


Aerocool X-Vision Fan and Temperature Controller

Gaming Mouse/Keyboard, maybe Logitech G700 series (im open to suggestion on a mouse/pad)

TP-LINK TL-WN722N Wireless Adapter

ADATA Superior Series 16GB S102 USB 3.0 Flash Drive

Western Digital WD Elements 2 TB External Harddrive

Liquid Cooling:

Pump: D5 (Swiftech 655) variable

Radiator: XSPC RX480 or Black Ice Gtx560 (if I can fit it in the case)

I think that's everything. I appreciate your time and your opinions; Thanks in advance for any help.
a b ) Power supply
June 17, 2012 1:35:42 AM

Absolutely. That Seasonic unit is the basis of many top rated power supplies that other companies rebrand and resell. It'll power 2x gtx 580's just fine and a healthy CPU overclock.
June 17, 2012 1:36:25 AM

Thanks for that info; I really do appreciate it. If I'm pushing it that hard, isn't it safe to say that it will crap out a lot faster than if I got something with more headroom, like a Seasonic 1000 watt psu?