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What's a good PSU for SLi 780's?

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  • Power Supplies
  • Graphics Cards
  • Nvidia
Last response: in Graphics Cards
June 15, 2014 4:16:32 AM

So I'm building a new rig in August and I've decided that I'll get 1 780, then add another one down the road, but what's a good power supply to do this? (Quick heads up: I live in the UK so I'm limited to what's available on Amazon UK, and there seems to be an abundance of Corsair PSUs with some good reviews)

System specs:
CPU: i7 4770K
GPU: 2x GTX 780
RAM: Either 8GB or 16GB of Corsair Vengeance
SSD/HDD/ODD: 1x Samsung 840 EVO 120GB, 1x WD Blue 1TB, 1x LiteON DVD drive
Mobo: Gigabyte G1 Sniper z87
CPU Cooler: Corsair H80i
Case: Fractal Design Define R4


So yeah, any help would be greatly appreciated.

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June 15, 2014 4:37:39 AM

So a higher quality PSU but a lower wattage will do me fine?
Thank you both for your replies, I assume that 80+ Gold/Bronze/Silver/Platinum is how good the capacitors are rated?
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a b U Graphics card
a b Î Nvidia
June 15, 2014 4:38:25 AM

When I was looking I was told 850w minimum.
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June 15, 2014 4:40:50 AM

both suggested psu's have high grade capacitors , you can always give yourself more headroom if unsure
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a c 87 ) Power supply
a c 395 U Graphics card
a c 126 Î Nvidia
June 15, 2014 4:48:09 AM

IllusoryLawyer1 said:
So a higher quality PSU but a lower wattage will do me fine?
Thank you both for your replies, I assume that 80+ Gold/Bronze/Silver/Platinum is how good the capacitors are rated?


Certification is one part, but that is mainly efficiency. Both PSU's listed will do a great job, 850W is somewhat overkill.

There is also 80+ Titanium, but that is too expensive. Platinum is exceptional.
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a b U Graphics card
June 15, 2014 5:16:40 AM

IllusoryLawyer1 said:
I assume that 80+ Gold/Bronze/Silver/Platinum is how good the capacitors are rated?


No, it's how well it converts AC from the wall socket into DC for your computer. The starting point is 80%, going from bronze-> silver-> gold-> platinum each is more efficient over a larger range of wattage outputs.

Take this scenario
Your system draws 400W from the power supply.
An 80% efficient power supply would need to draw 500W from the power socket to supply that 400W.
A 80+ platinum supply can reach efficiencies above 90%.
Let's say you have a platinum supply and for talking sake it's operating at 90%.
Your system would still draw 400W from the power supply.
BUT, the power supply would only need to draw 450W from the wall socket.
It supplies the same to your system but it draws less from the wall socket because it's more efficient.
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June 15, 2014 5:18:16 AM

He is asking about Sli 780's which usually recommend 650w and 42A for a single 780.
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a c 87 ) Power supply
a c 395 U Graphics card
a c 126 Î Nvidia
June 15, 2014 5:21:18 AM

Yes, that is correct.
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