Will I be able to run R7 250X?

[Usamaahmed]

I was wodering if I could run Asus R7 250x with a 365 watt psu.
Ik AMD says I should have a 4500 watt psu, but when I calculated my pc takes up about 200~240 watts without a gpu, and r7 250x requires only 80 specific to it and I have 12 amps on the 12v rail. Btw, I'm also currently GTX 650 2gb oc on the same psu without any problem and its supposed to require 400w, can I replace it with a r7 250x?

 

[madmatt30]

A 365w PSU ?? What is this ? A HP prebuild ??
12v 12a can't be right because you wouldn't be running a 650 on it currently if it were.

What's the actual psu model number ?? Off the PSU label itself.

You are aware that a 250x is not that bigcan upgrade over a gtx 650??
Maybe 15% at best.

 

[Usamaahmed]

http://imgur.com/effjxJ8

Its this psu, and yes its an hp prebuild and i'm running a GTX 650 2 gb gigabyte on it comfortably. And yes I'm aware its not a huge improvement but I'm getting the 250x for free so just want to make sure running it wont damage my pc.

 

[King_V]

Well, the GPU makers tend to overstate because they don't know whether you're running a single power efficient processor in your machine and few accessories, or an overclocked beast, multiple HDD and optical drives, lots of fans and RAM, etc. They have to assume for the worst-case-scenario.

In that picture, I see two 12-volt rail notations. My normal initial guess is to just say add them up, so..

12V x 12.0A = 144W
12V x 14.5A = 174W

144 + 175 = 319W for the 12V rail.

Typically, that's how I'd do the math . . but the particular notation of the 14.5A one saying 12Vcpu rather than just 12V has me a little confused... simply because I've never run into that before.

My *guess* is that the notation means that there's 174W available for the CPU, and 144 for everything else that uses the 12v rail, but do NOT quote me on this! I'm hoping somebody else will chime in and explain more clearly that notation they're using, as I believe it's been years since the ATX spec required the CPU to have its own separate rail.


That said, also, the difference between a stock GTX 650 (64W) and the R7 250X (80W) is 16 watts. Maybe less of a difference given that the 650 is overclocked and thus might have a slightly higher power draw.

It might be helpful to do a breakdown of everything in the system to see how you got that 200-240 total that the machine is using, but that's only if my speculation about the 12Vcpu marking is accurate.

(geez, I gave more questions than answers, didn't I?)

 

[madmatt30]

Its going to be fine , its single rail anyway , I'd imagine those max amp specs on the 12vcpu are to do with the wire gauge more than anything else.

 

[Usamaahmed]

Well i have a e8400 processor 2 cores, 1 hdd 150 gb, 1 dvd rom drive(normally disconnected unless i want to ise it) drive, 2 fans(both came pre built with the pc), 4 gb ram. I guess thats not much. So can somebody please tell can I swap my 650 for 250x safely?

 

[madmatt30]

You're not even going to hit 200w total with a 250x in there.

 

[Usamaahmed]

Thanks then