Is a Corsair 650 watt enough for xfire 7970?

{SAS}TB · 8 Dec 2012 at 11:43

My HX1000 wasn't enough for three 7970s at stock - nice shiny Enermax 1500 did the trick

whyscotty · 8 Dec 2012 at 12:08

I wouldn't risk it even running stock clocks

3930k @ 4.6 Crossfire MSI 7970 OC (1.2v) 1100/1600 draws over
800watts on my AX1200i

delta0 · 8 Dec 2012 at 12:10

Nate Silvers said:
Are you sure that's a direct translation from your computer, maybe 1150 is really only 700. a lot of people say 1000watts is total overkill. I think 800 is the max.

That does depend on the efficiency of the PSU, it could easily be over 900w.

Sasahara · 8 Dec 2012 at 14:18

Tonester0011 said:
That was my power draw on 3D11 with 1.3v going through the cards.
750w from the wall is actually only about 600-650w from your PSU.

Meaning your current PSU is fine, but running a PSU at near maximum capacity isn't the best way...if you've got the spare money - upgrade to a decent 750-850w PSU. If not, shouldn't worry too much as the Corsair units are pretty decent.

Closer to 650 W - 700 W unless you have a **** PSU (I doubt that).

Taking into account ED11 only really uses 1-2 CPUs core when bencing the graphics.

When maxing out power useage I use OCCT power supply test which maxes out the CPU & GPU.

750 W is the safe minimum PSU I'd get, but 850 W would be recommended for some overhead.

Nate Silvers · 8 Dec 2012 at 15:28

wazza300 said:
http://www.overclockers.co.uk/showproduct.php?prodid=CA-005-XF&groupid=701&catid=123&subcat=1497

a psu works best at 80% or under,any higher and its gonna be less efficient,plus a smaller psu will have to work harder/run hotter and probably go pop quicker than a larger psu

doesnt matter how large the psu is the components will only use what it needs

Alright sounds like amplifiers for audio, is that XFX a good choice compared to a Corsair? Why are Corsair ones so damn expensive?

delta0 · 8 Dec 2012 at 15:37

Nate Silvers said:
Alright sounds like amplifiers for audio, is that XFX a good choice compared to a Corsair? Why are Corsair ones so damn expensive?

They are extremely good. The AX series for example is a re branded seasonic which is regarded the best you can buy.

Gregster · 8 Dec 2012 at 15:41

XFX are also Seasonic PSU's

Guest2 · 8 Dec 2012 at 16:31

Better to have more than less.

I have a Corsair TX850 running and i5@4ghz, GTX 570, 3x1tb mechanical and 1 ssd

Personally I would go for a lot more than 650 watt on xfire 7970s. A few years back I had a low quality 450watt PSU and it popped and took out my 8800GT card, wasn't happy. Spend £20 or £30 more and go with a 1000 watt one

wazza300 · 8 Dec 2012 at 16:34

gregster said:
XFX are also Seasonic PSU's

+1

they have 5 year warranty aswell what more do you need

wunkley · 8 Dec 2012 at 16:48

I was running 2 x GTX 670's with an old Antec 650w truepower trio and the rig in my sig, until recently. One of the 670's is borked (long story) but it has/ had nothing to do with power supply issues. I will say that when running something really GPU intensive (like Skyrim fully modded up and max ENB settings) and I was using SLI, the PSU fan did used to really crank up, and it worried me a bit as I felt like it must be straining quite hard. But, it does work fine

Nate Silvers · 8 Dec 2012 at 17:09

Seems to be 650watt average is good if you are not running sli, I notice a lot of those don't have dual sli connections too. Who knows how new games are gonna get stressed so I think 800+ is safe and 1000 watt would be sweet but very expensive. So question is a quality 850 watt or a cheaper 1000 watt?

gregster said:
XFX are also Seasonic PSU's

If this is the case would you rather have a 1000 watt Antec PSU or XFX 850watt?

Gregster · 8 Dec 2012 at 17:16

YOUR BASKET
1 x XFX 850W XXX Edition Modular '80 Plus Silver' Power Supply £94.99
Total : £105.49 (includes shipping : £8.75).

I bought the 1050W Black edition XFX PSU (from a couple of recommendations) and it does the job a treat.

This 850W will keep you safe for sure and good price

Remember though, I know nothing about PSU's but do know that Seasonic are supposed to be the best.

wunkley · 8 Dec 2012 at 17:17

If I ever get my other 670 issue sorted out and I go SLI again, if it does keep feeling like it's 'straining' I may get a new PSU. And I'd get me a decent modular 850w I think, though a good 750w would probably do.

Darujhistan · 8 Dec 2012 at 18:06

What wattage would people reccommend for XFIRE OC'D 7850s and an OC'D CPU?

With a few fans, SSD and 2 HD's?

Gregster · 8 Dec 2012 at 18:12

Darujhistan said:
What wattage would people reccommend for XFIRE OC'D 7850s and an OC'D CPU?

With a few fans, SSD and 2 HD's?

If it is one 6 pin connector, AMD recommends a 500W PSU (for one GPU) and if it is two 6 pin connectors, AMD recommend a 600W PSU. Going by this, I would feel a 650 is pushing it (especially with a tidy overclock). Somebody else with more knowledge would have to confirm though.

Darujhistan · 8 Dec 2012 at 18:19

gregster said:
If it is one 6 pin connector, AMD recommends a 500W PSU (for one GPU) and if it is two 6 pin connectors, AMD recommend a 600W PSU. Going by this, I would feel a 650 is pushing it (especially with a tidy overclock). Somebody else with more knowledge would have to confirm though.

Thanks, I have an 850W PSU right now, but it's too loud, the fan seems to be at 100% at idle, I can hear it above everything. I'm gonna buy a new Corsair 760i or 860i (fan doesn't even come on until load), just trying to work out whether it's worth the extra £10-£15 more on 860W.

Gregster · 8 Dec 2012 at 18:24

When I bought my 750W Antec TP a few years ago, I felt it would be plenty and it cost me just shy of £100. After seeing several upgrades, the PSU got switched from different hardware-cases and did the job. I never imagined I would end up with 3 screens and two GPU's and wished I had invested in a bigger PSU the first time (hindsight is great).

Moral of the story is, you can't regret having too much power and buy what your budget allows.

Darujhistan · 8 Dec 2012 at 18:30

gregster said:
When I bought my 750W Antec TP a few years ago, I felt it would be plenty and it cost me just shy of £100. After seeing several upgrades, the PSU got switched from different hardware-cases and did the job. I never imagined I would end up with 3 screens and two GPU's and wished I had invested in a bigger PSU the first time (hindsight is great).

Moral of the story is, you can't regret having too much power and buy what your budget allows.

You're probably right, I got caught out last time buying a cheaper model.

Tonester0011 · 8 Dec 2012 at 19:26

Darujhistan said:
Thanks, I have an 850W PSU right now, but it's too loud, the fan seems to be at 100% at idle, I can hear it above everything. I'm gonna buy a new Corsair 760i or 860i (fan doesn't even come on until load), just trying to work out whether it's worth the extra £10-£15 more on 860W.

If you bought the 860W it would aid in any future rigs/components you might buy. The chances are, with your rig...the fans wont even come on during load.

Fantastic PSUs (going by the 1200i) if you like quiet.