Upgrading my system. How much wattage should I buy?

ThexMasterr · Oct 31, 2013

I am looking to upgrade my current system. The specs I am running now:
ASrock Extreme3 970 mobo
AMD fx-4100 oc'd to 4.2 ghz
AMD Radeon HD 7950 (HIS Iceq Turbo)
8 gigs of G-Skill gaming ram
and standard fans and a 1TB hard drive with a 600w PSU. It runs fine.

What I want to upgrade to is to get an AMD FX-8320, a new case with more fans, and another 7950. I would also like a little head room to install a water cooling system if I need to. I assume 600 watts is not enough to run that, but how much will I truly need?

I have run the power supply calculator several times, with very different results. Once I got 728, another time I got 530, and another time I got 560.

Any help would be much appreciated.

Ectorr · Oct 31, 2013

For the full system u need about 700W.

Blaise170 · Oct 31, 2013

It will use about 600W on stocks, so you should get 700-750W to be safe.

ko888 · Oct 31, 2013

For a system using two AMD reference design Radeon HD 7950 (non-Boost Edition) graphics cards in 2-way CrossFire mode AMD specifies a minimum of a 750 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 45 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

Ectorr · Oct 31, 2013

ko888 :

For a system using two AMD reference design Radeon HD 7950 (non-Boost Edition) graphics cards in 2-way CrossFire mode AMD specifies a minimum of a 750 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 45 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

Ahh the PSU god is here, im retreating

ThexMasterr · Oct 31, 2013

Ectorr :

Thank you so much for answering so quick.

ThexMasterr · Oct 31, 2013

Blaise170 :

Thank you for answering so quickly.

ThexMasterr · Oct 31, 2013

ko888 :

For a system using two AMD reference design Radeon HD 7950 (non-Boost Edition) graphics cards in 2-way CrossFire mode AMD specifies a minimum of a 750 Watt or greater system power supply. The power supply should also have a maximum combined +12 Volt continuous current rating of 45 Amps or greater and have at least four 6-pin PCI Express supplementary power connectors.

Total Power Supply Wattage is NOT the crucial factor in power supply selection!!! Sufficient Total Combined Continuous Power/Current Available on the +12V Rail(s) rated at 45°C - 50°C ambient temperature, is the most critical factor.

Overclocking of the CPU and/or GPU(s) may require an additional increase to the maximum combined +12 Volt continuous current ratings, recommended above, to meet the increase in power required for the overclock. The additional amount required will depend on the magnitude of the overclock being attempted.

That is awesome. Thank you so much for your detailed answer. I will look into it more.

Ectorr · Oct 31, 2013

ThexMasterr :

ko888 :

That is awesome. Thank you so much for your detailed answer. I will look into it more.

Cuz he is the PSU god!! All hail !!!

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Upgrading my system. How much wattage should I buy?

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Blaise170

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ko888

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