What wattage PSU do i need

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russiannick29

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Feb 27, 2013
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How many watts would I need for my system? I'm using a CM 620 silent currently and everything works well.

Asrock Extreme4 LGA1155 motherboard
Intel i5 3570k processor (looking to OC to 4.5)
CM Hyper 212 Evo heatsink
Coolermaster HAF XM- 3 LED 200mm fans, 1 120 mm fan, 1 200 mm fan
XFX Black Edition HD797A graphics card + additional Radeon 7970 brand unsure
Seagate 2TB 7200 RPM HDD
OCZ Vertex 60 GB SSD
2x8 GB Ripjaws X DDR3 RAM
Razer Anansi
Razer Imperator
LED touchscreen fan controller

 
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lonewolf7
Single Radeon HD 7970 - requires 31Ampere and a 550W PSU minimum

Measured power consumption
1.System in IDLE = 163W
2.System Wattage with GPU in FULL Stress = 355W
3.Difference (GPU load) = 192W
4.Add average IDLE wattage ~3W
5.Subjective obtained GPU power consumption = ~ 195 Watts

Radeon HD 7970 Crossfire - On your average system the cards require you to have a 750 Watt power supply unit as minimum.

So this will be a decent PSU for you :

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply ($129.99 @ Newegg)
Total: $129.99
(Prices include shipping, taxes, and discounts when...
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leo2kp

leo2kp

Distinguished
Oct 9, 2006
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Because you are overclocking with two graphics cards, I would say 1000watts minimum to be safe. But you can go to any Power Supply Calculator to get a better idea. Here is one I use sometimes: http://www.thermaltake.outervision.com/
 
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MasterMace

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Oct 12, 2010
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Need to make sure the PSU has enough Amps on the 12v rail. If you're using 2-7970s you'll want a 1000W PSU, as they pull upwards on 300W+ each. Unfortunately, the 150W difference between an 850W PSU and 1000W PSU is costly.
 
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lonewolf7

lonewolf7

Splendid
May 6, 2013
5,113
2
24,965
Single Radeon HD 7970 - requires 31Ampere and a 550W PSU minimum

Measured power consumption
1.System in IDLE = 163W
2.System Wattage with GPU in FULL Stress = 355W
3.Difference (GPU load) = 192W
4.Add average IDLE wattage ~3W
5.Subjective obtained GPU power consumption = ~ 195 Watts

Radeon HD 7970 Crossfire - On your average system the cards require you to have a 750 Watt power supply unit as minimum.

So this will be a decent PSU for you :

PCPartPicker part list / Price breakdown by merchant / Benchmarks

Power Supply: Corsair Professional 850W 80+ Gold Certified Semi-Modular ATX Power Supply ($129.99 @ Newegg)
Total: $129.99
(Prices include shipping, taxes, and discounts when available.)
(Generated by PCPartPicker 2013-11-20 14:11 EST-0500)

 
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