New GTX 900 Series PSU Requirement

RokuKushala · Nov 12, 2014

I was looking to upgrade my old Nvidia 560 Ti to one of the new Nvidia 900 Series cards, and under the PSU requirement most only say '500 Watt Power Supply'. I have a default Dell 875w Psu, but I am concerned about the amps on the Vrail. My current PSU on the +12VA is 18A. Since the 900 series only says '500 Watt Power Supply' will it be compatible or is there a way to check the how many amps the 900 series require on the +12VA rail.

prit87 · Nov 12, 2014

I would not recommend to use that PSU get a xfx 550 watt PSU for the 900 series the gtx 970 requires 28amp @12+v and gtx 980 requires 30 amps @ 12+v.

RobCrezz · Nov 12, 2014

You sure it doesnt have more 12v rails? Thats fairly low amps on the 12v, for a so called "875w" psu. Dell PSUs are normally pretty good for OEM.

RokuKushala · Nov 12, 2014

This is a picture of my PSU: http://i.imgur.com/2rPhutX.jpg

uplink-svk · Nov 12, 2014

It's low amps, but not "low" after all. 18 amps x 12 volts = 216 watts per rail. So combined, it can go up to 432 watts, I mean 2 x 12 volt PCi-e rails. So You're just fine

P.S.: PCi-e supplies VGA from 40-80 Watts, that combined with 12v 216 watts is way over the limits of any modern GPU.

prit87 · Nov 12, 2014

RokuKushala :

I am not saying the card will not run but why risk a high end card for a old PSU get a xfx 550 watt PSU its 44$.

uplink-svk · Nov 12, 2014

XFX [You didn't specify model] offers 42-45A combined on all 12V rails, that's 2 rails - 1 6 pin, one 8 pin, that's about 30 amps per one rail, and the rest per second. It kind of does make a difference, and also doesn't. I say he'd try the built in one, if it does trouble, he changes it for XFX?

Or even better, 2 x 6-pin PCI Express (PCIe) power, this is what it officially does, so if he gets VGA with 1 x 8 pin and 1 x 6 pin, he must go for XFX, if he gets model with 2 x 6 pin, or 1 x 6 pin, he can stay on Dell.

And yes, DELL is kind of a weird PSU, it has 875 watts, but hell, the connectivity is poorer than with some entry level 350W PSU.

prit87 · Nov 12, 2014

uplink-svk :

Yes he can do that and the card will run i am not speaking about the voltage and wattage i am just saying for a high end card its better to get a good quality PSU like seasonic , xfx, rosevile capstone , antec HCG.

uplink-svk · Nov 12, 2014

prit87 - dell doesn't have nice black and red, or black and yellow, or other color package, or some fancy cables, etc. but they cannot afford to have low-quality PSUs, even without "certificates", like bronze, silver, gold or platinum. Just FYi.

P.S.: I personally would go for HX850/RM750/SS Platinum, or something, but maybe he doesn't have enough cash for both...

RobCrezz · Nov 12, 2014

Look at the pic guys, the dell has 4x 12v rails with 18a each, its got more than enough power.

uplink-svk · Nov 12, 2014

RobCrezz - I already pointed that out in my first reply.

RobCrezz · Nov 12, 2014

uplink-svk :

No, you incorrectly pointed out that it had 2 rails, not 4.

RobCrezz · Nov 12, 2014

prit87 :

uplink-svk :

Yes he can do that and the card will run i am not speaking about the voltage and wattage i am just saying for a high end card its better to get a good quality PSU like seasonic , xfx, rosevile capstone , antec HCG.

Dell PSUs are actually very good quality.

prit87 · Nov 12, 2014

uplink-svk :

RM is not a good quality PSU

uplink-svk · Nov 12, 2014

prit87 - what in particular is wrong about RM?

RobCrezz - he cannot connect four 12V rails into any single GPU, without some elaborate convertors, so that's why I worked with 2 x 12V rails. Well, thought common sense would kick in, but it didn't. So I'm writing it now, as cpt. Obvious. Max. number of rails I've seen on non-professional VGAs in my life was 2 x 8 pin.

RobCrezz · Nov 12, 2014

prit87 :

... IMO the RM PSUs are good quality.

Do you read JonnyGurus PSU reviews? his testing of PSUs and reviewing is at the highest level and he gives the RM850 a 9.2/10

That is a great score.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=369

The RM650 gets a 8.7, still a brilliant score.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=363

RobCrezz · Nov 12, 2014

uplink-svk :

Are you aware that they aren't always wired up 1 rail to 1 connector? Anyway, it makes no difference, as long as psu uses the connectors that are using rails not sharing with the CPU then there is plenty of power.

uplink-svk · Nov 12, 2014

RobCrezz -

he cannot connect four 12V rails into any single GPU, without some elaborate convertors

RobCrezz · Nov 12, 2014

uplink-svk :

...

As I said, many OEM PSUs state multiple rails, but in reality they have a single 12v source.

http://www.jonnyguru.com/forums/showthread.php?t=3990

Is it true that some PSU's that claim to be multiple +12V rails don't have the +12V rail split at all?

Yes, this is true. But it's the exception and not the norm. It's typically seen in Seasonic built units (like the Corsair HX and Antec True Power Trio.) It's actually cheaper to make a single +12V rail PSU because you forego all of the components used in splitting up and limiting each rail and this may be one reason some OEM's will not split the rails, but say they are split. Some system builders adhere very closely to ATX12V specification for liability reasons, so a company that wants to get that business but also save money and reduce R&D costs will often "fib" and say

prit87 · Nov 12, 2014

uplink-svk :

First of all its a tier 3 PSU it have Poor capacitors Poor ripple suppression and horrific tenperatures so its an average quality PSU in the corsair brand like vs,cx,cs good brands from corsair would be HX,AX,TX.

prit87 · Nov 12, 2014

RobCrezz :

prit87 :

... IMO the RM PSUs are good quality.

Do you read JonnyGurus PSU reviews? his testing of PSUs and reviewing is at the highest level and he gives the RM850 a 9.2/10

That is a great score.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=369

The RM650 gets a 8.7, still a brilliant score.

http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story6&reid=363

Jonny guru gives every PSU a 9 rating including corsair cx PSU look at this http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=214

RobCrezz · Nov 12, 2014

prit87 :

RobCrezz :

Jonny guru gives every PSU a 9 rating including corsair cx PSU look at this http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=214

Because that PSU is good. You think you know better than Jonnyguru when it comes to PSUS? :lol:

prit87 · Nov 12, 2014

RobCrezz :

prit87 :

RobCrezz :

Jonny guru gives every PSU a 9 rating including corsair cx PSU look at this http://www.jonnyguru.com/modules.php?name=NDReviews&op=Story4&reid=214

Because that PSU is good. You think you know better than Jonnyguru when it comes to PSUS? :lol:

If CX psu are good then i am king of the world.

RobCrezz · Nov 13, 2014

prit87 :

RobCrezz :

prit87 :

Because that PSU is good. You think you know better than Jonnyguru when it comes to PSUS? :lol:

If CX psu are good then i am king of the world.

Not king of the world, just another parrot repeating what he hears everyone else saying without knowing the facts.

prit87 · Nov 13, 2014

RobCrezz :

prit87 :

RobCrezz :

If CX psu are good then i am king of the world.

Not king of the world, just another parrot repeating what he hears everyone else saying without knowing the facts.

ha ha

New GTX 900 Series PSU Requirement

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