Multiple 12v Rails - Adding together?

Fincotts1 · May 10, 2015

Hi Toms HW, just a quick question regarding 12v rails. I am told online i need 30a or more in a 12v rail to run a gtx 980, i wanted to know whether because my psu has multiple 26a 12v rails can i add them together , therefore giving my psu a total of 52a on 2 12v rails and being able to run a gtx 980?

DeathRabit · May 10, 2015

In theory yes but if you, have low quality PSU this can cause instability.
Until you have good PSU everything will be ok

DonkeyOatie · May 10, 2015

They are being a bit conservative. 30a x 12v is 360Watts. A GTX 980 has a 160W TDP, with spikes up to 300 (maybe). It will work fine, provided the PSU delivers on its promise. What do you have?

jazzy663 · May 10, 2015

I was wondering about this too, would be nice if someone could clarify.

Dual +12v rails, both with 26A = 52A?

DeathRabit · May 10, 2015

In theory Yes but for stability issue I prefer single rail PSU

DonkeyOatie · May 10, 2015

That should be a 650W PSU, 624 (2 x 26 x 12) on the 12 volt rails and the rest on the 3 and 5 volt rails. It helps isolate the GPU transient loads from the CPU load, if done right.

Fincotts1 · May 10, 2015

DonkeyOatie :

Thanks!! Thats kinda the whole reason i wanted to ask! I have a dodgey Tesla one which is nowhere to be found on the internet! So if i buy my gtx 980 (evga 04G-P4-2982-KR) It will all be ok?

DonkeyOatie · May 10, 2015

I would not use a dodgy PSU on a high performance system. The down-side is so great. How old is the PSU? I'd be concerned that you had lost too much 'goody' from the capacitors, especially for a less than premium PSU. What are your practical options? A new/better PSU will last for many years.

tiny voices · May 10, 2015

Multiple vs. single rail has nothing to do with stability if both units are built properly. There are TOP quality single and mult-rail PSUs.

Fincotts1 · May 11, 2015

DonkeyOatie :

The PSU is about 1 and a half years old.

How do you mean practical options?

DonkeyOatie · May 11, 2015

What can you afford, what can you get? No point me telling you what to get if you cannot affort it, or cannot get it wherever you are.

Fincotts1 · May 12, 2015

what? I wanted to know what practical options meant, not what to get?

Saif Uv · May 12, 2015

tiny voices :

My PSU has three 12V rails and its made by Delta co. How good is it?

DonkeyOatie · May 12, 2015

Fincotts1 :

No, 'practical options' means what I said, what you can actually do practically, as opposed to theoretical solutions which may not be possible in your case.

Fincotts1 · May 13, 2015

aaaaah sorry i see, i can afford one up to around £80 and i would prefer it to be modular

DonkeyOatie · May 13, 2015

An XFX P1, either 650 or 750 W. 650 is plenty for any CPU (except a FX 9590) and a GTX980. Sometimes local prices and rebates makes the more powerful PSU cheaper.

Search

Multiple 12v Rails - Adding together?

Fincotts1

Distinguished

DeathRabit

DeathRabit

Splendid

DonkeyOatie

Champion

jazzy663

Honorable

DeathRabit

Splendid

DonkeyOatie

Champion

Fincotts1

Distinguished

DonkeyOatie

Champion

tiny voices

Titan

Fincotts1

Distinguished

DonkeyOatie

Champion

Fincotts1

Distinguished

Saif Uv

Reputable

DonkeyOatie

Champion

Fincotts1

Distinguished

DonkeyOatie

Champion

TRENDING THREADS

Latest posts

Moderators online

Share this page