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quiet PSU for Dual 980ti set up + overclocked i7 4790k

post #1 of 11
Thread Starter 
I am thinking of potentially going with dual 980ti instead of one 1080

My question is what good QUIET PSU can I find for this set up? I started hearing a buzz in my current Corsair 650w PSU recently as well.

How many watts do I need, really?


My cpu will be overclocked to 4.7, I will not be overclocking the video cards though.

Power supply will be in a separate compartment, away from all of the components as I have Corsair Air 540
Cubic Rubik
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Cubic Rubik
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post #2 of 11
corsair ax860i
corsair hx750i
evga supernova 750/850w P series....they have an integrated fan control switch...
post #3 of 11
Any semi-passive quality unit will likely do. 980Tis will make a bit of noise under load anyway.
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post #4 of 11
why not dual 1070s instead of dual 980ti's ?
semi-passive 750w/850w units will most likely NOT run passively with dual 980ti
even if it did, remember that two AIB 980Ti's is probably about 550W of heat dumped into the case, which means it's gonna get hot in there after some time, which in turn will require higher fan speed/more noise. The noise from your PSU will be the smallest problem.
Edited by Klocek001 - 6/21/16 at 11:35am
post #5 of 11
Thread Starter 
Quote:
Originally Posted by Klocek001 View Post

why not dual 1070s instead of dual 980ti's ?
semi-passive 750w/850w units will most likely NOT run passively with dual 980ti
even if it did, remember that two AIB 980Ti's is probably about 550W of heat dumped into the case, which means it's gonna get hot in there after some time, which in turn will require higher fan speed/more noise. The noise from your PSU will be the smallest problem.

As far as 1070s, well...the pricing.

I will be buying a card in August, so if 1080s are astronomical like now I might consider buying GTX 980 SLI instead...but then I will need new PSU, so I'm debating right now.

It's true on the noise levels within the case...I just simply don't like the buzzing, fan noise is fine, but the electrical buzz within the PSU is what gets me. I just had that noise crop up in the system, then it just went away...so can't tell if PSU is going bad.
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Cubic Rubik
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post #6 of 11
Quote:
Originally Posted by XLifted View Post

It's true on the noise levels within the case...I just simply don't like the buzzing, fan noise is fine, but the electrical buzz within the PSU is what gets me. I just had that noise crop up in the system, then it just went away...so can't tell if PSU is going bad.

Buzzing or coil whine can occur in any unit so basically you just have to pick one and see if it makes noises or not.
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post #7 of 11
You can always take apart your power supply, and then clean out any dust accumulated inside, including the fan area, and then put in a drop of synthetic oil into the fan bearing, see if that help fix your buzzing sound. I have a similar system like you, 4790k o/c to 4.8ghz (see my sig) and I just sold my Asus Strix 980 o/c 1525/7800 about 2 weeks ago and all powered by a corsair CS450M, so your 650w is plenty for 980 sli.

I agree with a 1070 SLI, and that's another reason why I sold my 980 and upgrade to a 1070. biggrin.gif
post #8 of 11
I was also considering adding another 980Ti since the prices were dropping, but then I thought that spending just a tiny a little bit more on 1070 SLI will have great benefits over the course of time. While a single 980Ti can probably outpace a 1070, in SLI I expect the latter to be able to maintain the clock and even have oc headroom, while 980Ti would most certainly temp throttle all the time.
I had 980Ti 6G Gaming and it was running around 77 degrees with +75% fan clocked at out of the box 1.35GHz after 15-20 minutes . In SLI it would probably touch 90. I expect two blower style 1070s to be a much better choice for a SLI setup.
Edited by Klocek001 - 6/21/16 at 12:13pm
post #9 of 11
Check the EVGA stuff, namely the supernova B2 series. I have the 750w with a 980ti and a 5820k, handles it fine.

The special part about these PSus is that they have an "Eco mode" switch on the back. This basically enables/disables the fan on the psu until the PSU is drawing enough power where the fan automatically switches on/off.

I have mine on "off", and chances are the fan will NEVER turn on. People put blow driers to these things and the fan doesn't get enabled.

Forget these "quiet series" power supplies- just get one without a fan or one with an ECO mode.
post #10 of 11
The B2 series does not have any kind of hybrid fan mode
Sure you are not thinking of the G2 series?
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