Can a PSU ASUS U65-GA support a GTX 750?

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Mujik

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Oct 1, 2014
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Hi everyone, so... a couple of years back i bought a PC with the following specs:

Processor: Intel Core i5 2500 3300 MHz Sandy Bridge
Motherboard: ASUS P8H61-M LE Rev 3.0
Video Card: NVIDIA GeForce GTX 460
RAM: 2x 4 GB DDR3-1333 DDR3 SDRAM
Hard Disk: SAMSUNG HD103SJ ATA Device ( 1 TB )
DVD+RW/DVD-RW: Hitachi HL-DT-ST DVDRAM GH22NS50 ATA Device
PSU: ASUS U-65GA 650W
Case: don't know the name but still has lots of space in it....

Them a few days back my VGA showed some problems with the cooler so i started to think about upgrading it to an GTX 750, but i'm a little confused if my PSU will be able to hold it, i read in some places that this the GTX 750 needs a amperage of 20A in the 12+V tray (my PSU only provides 16A), but i also read in another places that a vga can work with a little less amp....
so my question is, can a PSU ASUS U65-GA support a GTX 750? 'cause i think that the 12+V3 will be unused, so i was thinking that even if the VGA doesn't work at full amp at least this might prevent the PSU form overloading...
also will the GTX 750 even work with a 16A?? yet another couple of questions, anyone knows if all the gtx 750 models ( standard, SC, Ti, FTW w/ ACW. 1 GB. 2 GB) have the same amperage requirements?? and if you think that the GTX 750 won't work with my current PSU can you give an advice of a good NVidia VGA that will work with it?

p.s.: sorry if i misspelled something, but english is not my mother-language.

p.p.s.: thanks in advance for your help.
 
Solution
C
No, they do not add up. They are on separate rails. 16A of power on each 12V rail is already 192W each which is pretty powerful.

http://www.overclock.net/t/315524/can-the-unused-amps-on-multiple-rail-psus-really-be-combined#post_3660142

Relates to your question and is answered by JonnyGuru, the guy who does an extensive review on many power supplies. Very Trustworthy.

For 3 12V rails each supporting 16A, you won't necessarily get 16x3=48 Amps total current but more realistically 2/3rd of it or at least when factoring in the safety margin.
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Cats869

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Aug 16, 2014
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I believe the 20A was meant to be for the overall system.

The GTX 750 should not consume a lot of power as it consumes around 50-60W and thats around 5A of current so your PSU should be able to handle that. A 650W PSU with only 16A of current on the 12V rail doesn't seem like a powerful PSU at all but it should be sufficient.

The GTX 460 consumes a lot more power than the GTX 750 if you think about it so you should be fine, no worries :)
 
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Mujik

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Oct 1, 2014
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Yeah I know that a 650W with only 16A on the 12+V is not a powerful PSU, and i also know that the gtx 460 consumes more than the gtx 750, but the former also uses two 6 pin power connectors (and so is able to use 32A from my PSU) while the gtx 750 only use one (and so it'll only be able to use 16A).
If the 20A requirement is for the overall system as you say then i should be fine, but if the gtx 750 cannot work with 16A then i need to start looking for another Gpu. So my doubt still continue......
Anyway thanks for your advice.
 
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Cats869

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Nvidia always will suggest a higher PSU requirement for their cards so it won't have to worry about customers complaining that their PSU blew up or whatever because the card needed more power. Companies will always include safety margins to save the consumers but also to save the company from hassle and lawsuits.

If your computer was able to handle a GTX 460, I'm 100% sure your computer will have no issue handling a GTX 750. A GTX 750 can probably even run on a 300W PSU albeit some small risk. I ran a 60W tdp card (HD 7750) on a 300W PSU.

Also, when I saw 650W PSU and 16A rail, I thought that the numbers just don't add up and I looked into your power supply and that it supports 3 12V rails that support 16A each. That means your computer is capable of handling probably 30-35A for 12V so your PSU is more than capable and ASUS PSUs though not the top of the line are still better than the lower end OEM PSUs so get rid of that doubt you still have and upgrade :) You will have no issue at all.

A 300W PSU usually has a 12V rail that has around 15A so it wouldn't make sense a 650W PSU has a 12V rail with only 16A and only one rail of that existed. 3 Rails makes much more sense.
 
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Mujik

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Oct 1, 2014
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4,510
hi thank you for your explanation, with that and some little research i did on my own i'm a lot more confident now...
just one last question...
even if each of the 12V rails have only 16A, if one of the three rails is unused does it mean that the other rail will be able to use 32A?? ( 16A plus another 16A of the unused rail)

p.s.: i'll just leave the solution unpicked for a couple of days, so my last question has a little more visibility in the forums... after that i'll give it to you cats869, thanks....
 
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Cats869

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Aug 16, 2014
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No, they do not add up. They are on separate rails. 16A of power on each 12V rail is already 192W each which is pretty powerful.

http://www.overclock.net/t/315524/can-the-unused-amps-on-multiple-rail-psus-really-be-combined#post_3660142

Relates to your question and is answered by JonnyGuru, the guy who does an extensive review on many power supplies. Very Trustworthy.

For 3 12V rails each supporting 16A, you won't necessarily get 16x3=48 Amps total current but more realistically 2/3rd of it or at least when factoring in the safety margin.
 
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