Recommended PSU wattage

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Tayfun123

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Aug 3, 2013
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Hi,

So this is my setup:

MoBo: MSI Z77MA-G45
CPU: Intel Core I5-3470@3.1GHz
GPU: ASUS HD7850-DC2-2GD5-V2
RAM: Kingston 8GB (1x 8GB) 1600MHz D
HDD:Seagate 500GB SATA III 7200RPM
DVD-RW drive, 2 LED fans


In the future I'm going to crossfire my gpu. According to Outervision's PSU calculator: I only need a 450W PSU ( with crossfire). But newegg's PSU calc recommends me to buy a 600W PSU.

Which one is the most reliable?
And will 500W be enough for a crossfire setup?
 
Solution
Sangeet Khatri
For crossfire, theoritically you would need a 550-600W PSU. But practically you should not get anything less than a 700-750W PSU for going dual GPU's because using the maximum potential of the PSU would make the PSU work too hard and the disadvantages can be:

1. The PSU would be too loud.
2. It might get damaged over time and might also damage other components.
3. At peak loads the PSU's do not show good efficiency hence more power would be required which would be wasted.

Anyways these are some of the PSU's that I recommend for crossfire setup :

1. Corsair CX 750 80 Plus Bronze : http://pcpartpicker.com/part/corsair-power-supply-cx750m
2. OCZ Fatal1ty 750W 80 PLUS Bronze : http://pcpartpicker.com/part/ocz-power-supply-ocz750fty
3...
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haynesr07

haynesr07

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Jul 14, 2013
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Well you have to remember, SLI/Crossfire does use up more power. I'd go with a 550 or 650 depending on sales and prices. Leaves more room for upgrades in the future. On my build I just did I snagged a 850M from Corsair for about 100 bucks where as the 750M was 115. So that's why I purchased that. Check your sales.
 
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Sangeet Khatri

Sangeet Khatri

Honorable
May 26, 2013
2,640
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13,460
For crossfire, theoritically you would need a 550-600W PSU. But practically you should not get anything less than a 700-750W PSU for going dual GPU's because using the maximum potential of the PSU would make the PSU work too hard and the disadvantages can be:

1. The PSU would be too loud.
2. It might get damaged over time and might also damage other components.
3. At peak loads the PSU's do not show good efficiency hence more power would be required which would be wasted.

Anyways these are some of the PSU's that I recommend for crossfire setup :

1. Corsair CX 750 80 Plus Bronze : http://pcpartpicker.com/part/corsair-power-supply-cx750m
2. OCZ Fatal1ty 750W 80 PLUS Bronze : http://pcpartpicker.com/part/ocz-power-supply-ocz750fty
3. EVGA SuperNOVA NEX750B BRONZE : http://pcpartpicker.com/part/evga-power-supply-120pb0750kr
4. XFX 750W 80 PLUS Bronze : http://pcpartpicker.com/part/xfx-power-supply-p1750snlb9

I hope this helps. If you spend a bit more then you can get some 80 Plus Gold PSU's too.
 
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Tayfun123

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Aug 3, 2013
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10,510


Well I am on budget, all I need is psu that can handle a crossfire setup. Every PSU calculator shows a different wattage and I don't know which I can trust.
 
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Tayfun123

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Aug 3, 2013
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Thanks, I think I'll buy the corsair one.
 
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haynesr07

haynesr07

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Jul 14, 2013
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They all have different formulas that is why. What I would say is $100 is not bad for a power supply. Getting over wattage is not going to affect your build. I should say to keep it on a Single rail as well. That's important to most builders. Corsair makes top of the line power supplies and I personally would not even experiment with another brand as PSU's connect into every single component in some shape or form.


I have a Bronze PSU, it's just as good for my build as my old Gold one was.
 
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