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About LinkBacksI'm going to replace my existing 550w PSU with a new PSU as I'm going for GTX660 in 2-way SLI configuration. Need good suggestion on which PSU to go for.
I prefer modular or semi-modular PSU.
I'm going to replace my existing 550w PSU with a new PSU as I'm going for GTX660 in 2-way SLI configuration. Need good suggestion on which PSU to go for.
I prefer modular or semi-modular PSU.
Well good news is unless you're running something odd in the rest of your components 550W is still more than sufficient, so just a case of getting a good quality one. This looks good:
http://www.scan.co.uk/products/450w-...nt-fan-atx-psu
(ignore URL, the product is a 550W apparently)
What's your budget?
Seasonic PSUs are my goto brand but they are quite pricey.
XFX 550W for £50 at Scan?
The Seasonic PSU linked to by kalniel is a good choice. I use a lot of Enermax PSU's in my builds so I recommend them based on experience and reviews written about them.
kalniel is also right about not needing more power than 550W for a GTX 660 SLI config so long as you don't have a liquid cooling system in mind or something else that uses a fair amount of power. If your current PSU is not older than 3 years and has good 12V rail amp ratings then I'd stick with it, you shouldn't need more than 40 amps on the 12V rails to power your SLI setup.
I'd get this if buying new with no budget restrictions: http://www.scan.co.uk/products/500w-...an-atx-v23-psu
Or if more budget conscious then this: http://www.scan.co.uk/products/550w-...-eps-12v-silen
The Seasonic kalniel linked to is the best bang for your buck option, great performance and quality for a lot less than what Enermax can offer.
ohh forgot to mention that I also overclock my i5 4670k. Does 550w enough then?
If you plan on overclocking your graphics cards as well then no, but with a CPU overclock and stock GTX660 SLI you could be OK depending on what else is in your case.
What else do you have in your case?
Yes. But don't forget to fill out your system details in your profile so we can checkOriginally Posted by hahcore
Bit-tech states i5-4670k consumption after overclock @ 4.6Ghz around 165W.
GTX 660 150W tops. Twice that for SLI.
Average PSU efficiency 85%. At 550W rated it can provide 465W to the system so with additional drives you could be pushing it.
No, you've got it wrong. A 550W rated PSU can provide 550W to the system. It's that simple, and nothing to do with the efficiency rating. A more efficient PSU will simply draw less from the wall to provide that same 550W.
The GTX660 takes around 100W max, so I'd expect max (and unlikely to ever be reached in real world) draw for a whole system to be around 400W if you have a huge number of mechanical drives and fans etc. A 550W supply would therefore be running at ~75% load at PEAK.
The real question is can the PSU put out the amps on the 12v rail for two cards, and in the PSUs we're listing, that's no problem at all.
Last edited by kalniel; 01-09-2013 at 09:32 PM.
My bad about the PSU.
Wiki stated TPD of the GTX 660 at 140W.
So I would say the consumption would be higher but in the light of new facts to me about PSUs, the stated PSUs are enough and will be enough.
To add to kalniel's remarks, good power supplies can actually supply more power than their rating as a few reviews prove meaning that the 550W rating is only for 24/7 use and if used for shorter periods could exceed that but it would impact on the power supplies longevity. I wouldn't suggest that you aim to get a PSU rated below the power draw of your system but it is much better to get a PSU that is very closely matched to your system usage because you will then be using the PSU in its most efficient range.
A 550W PSU matches an i5 4670K + GTX660 SLI very well, but just to be sure there aren't 5+ HDDs in a RAID array or something similar it is good to check what else is in the case.
http://www.bit-tech.net/hardware/201...l-cpu-review/6
I presume this is the bit-tech review you are talking about. They state that they are measuring the power consumption at the wall, so that means they were measuring the power consumption of the whole system.
You also have to remember that measuring at the wall doesn't take into account efficiency of the PSU.
True, but looking at the test setup you can safely estimate the consumption of the individual components.
For example the PSU's efficiency at 150W tends to be around 88% (Reference)), which would result in a total system consumption of 143W at load while overclocked and CPU stressed only, GTX680 at idle (hard to estimate), one SSD (2.25W max.), four sticks of DDR3 (4 x 2-3W) and a H100i (2 x 4.32W) cooler plus the motherboard.
I do have to admin that the consumption of the CPU has fallen drastically in the light of the new facts and would have to say that a 500W PSU would match his desired system power requirements much closer. Maybe even a 450W but that would be rather pushing it.
Last edited by Bonebreaker777; 02-09-2013 at 11:10 PM.
TPU measured the power consumption of the GTX 680 (in isolation) to be 14W with a single monitor and 46W with multiple.
http://www.techpowerup.com/reviews/N...TX_680/25.html
For some reason I don't have a long list of reviews for the Nvidia GTX 680, but other non-reference boards are between 13 and 25W (presume those are also single monitor, although haven't checked).
Personally I would buy a PSU with four PCIe connectors, which usually comes with 650W PSUs (there are exceptions obviously).
Well the 660 requires 1 PCI-E power connector, so the supplies mentioned have plenty for running SLI.
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