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12V 19 amp is enough to run R7 250 DDR5 ?

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  • Graphics
Last response: in Graphics & Displays
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September 13, 2014 8:59:41 AM

My PSU says it has 10amp on 12v1 rail, 14 amp on 12v2 rail. It also says combine current on 12v1 & 12v2 is 19 amp (max), Is it enough to run a R7 250 ddr5? I'm just so confused about the 12v amp calculation. :??: 

More about : 12v amp run 250 ddr5

September 13, 2014 9:04:58 AM

you will need about 300 watts,......this is just 220 watts
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September 13, 2014 9:15:48 AM

do you have a model# for the video card?
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September 13, 2014 1:27:19 PM

Sanjay Srivastava said:
you will need about 300 watts,......this is just 220 watts


300 watts just from 12v rail? :o 
then what are the 3v and 5v rails for? this is not a high power demanding gpu, I just wanna know the least amp on 12v
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September 13, 2014 1:29:02 PM

Emerald said:
do you have a model# for the video card?


sorry I didn't get it, but did you try to say "model of psu" ?
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September 13, 2014 1:40:58 PM

An R7 250 needs 75W for itself. Your CPU will pull all of its power from the 12V rail as well, any drives and fans will also be pulling the majority of their power from there. 80%+ of a modern computer's power draw is from the 12V rail, the 5V and 3.3V are used for driving a variety of micro controllers throughout the system like in SSDs.

With 2 drives(~10W), a 35W motherboard, and a 65W CPU you need about 195W from the 12V rail, you only have 228W to work with, assuming that your unit can even do its labeled ratings, particularly at raised temperatures. Most cheap/low powered units are rated at 25C and lose 3W/C over their rating.

AKA, your PSU is too weak to support any real discrete GPU, but there are cheap solutions to this problem. Assuming your system uses a normal PSU(HP recently switched back to proprietary ones :/ ) then you can just swap it out for a CX430 for $20, that will give you 32A on the 12V rail. Don't expect the CX430 to support a lot of OCing, its just meant to replace inferior stock PSUs and get you a unit that can run a real GPU at a low price.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
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September 13, 2014 3:21:10 PM

hunter315 said:
An R7 250 needs 75W for itself. Your CPU will pull all of its power from the 12V rail as well, any drives and fans will also be pulling the majority of their power from there. 80%+ of a modern computer's power draw is from the 12V rail, the 5V and 3.3V are used for driving a variety of micro controllers throughout the system like in SSDs.

With 2 drives(~10W), a 35W motherboard, and a 65W CPU you need about 195W from the 12V rail, you only have 228W to work with, assuming that your unit can even do its labeled ratings, particularly at raised temperatures. Most cheap/low powered units are rated at 25C and lose 3W/C over their rating.

AKA, your PSU is too weak to support any real discrete GPU, but there are cheap solutions to this problem. Assuming your system uses a normal PSU(HP recently switched back to proprietary ones :/ ) then you can just swap it out for a CX430 for $20, that will give you 32A on the 12V rail. Don't expect the CX430 to support a lot of OCing, its just meant to replace inferior stock PSUs and get you a unit that can run a real GPU at a low price.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


thanks, btw, I currently am using 6670 ddr3 (little OC'ed) which I assume, draws 60W. So, this additional 15W for R7 250 is gonna create a load that may harm my psu/gpu or other components?
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September 13, 2014 3:23:50 PM

naviidsamii said:
hunter315 said:
An R7 250 needs 75W for itself. Your CPU will pull all of its power from the 12V rail as well, any drives and fans will also be pulling the majority of their power from there. 80%+ of a modern computer's power draw is from the 12V rail, the 5V and 3.3V are used for driving a variety of micro controllers throughout the system like in SSDs.

With 2 drives(~10W), a 35W motherboard, and a 65W CPU you need about 195W from the 12V rail, you only have 228W to work with, assuming that your unit can even do its labeled ratings, particularly at raised temperatures. Most cheap/low powered units are rated at 25C and lose 3W/C over their rating.

AKA, your PSU is too weak to support any real discrete GPU, but there are cheap solutions to this problem. Assuming your system uses a normal PSU(HP recently switched back to proprietary ones :/ ) then you can just swap it out for a CX430 for $20, that will give you 32A on the 12V rail. Don't expect the CX430 to support a lot of OCing, its just meant to replace inferior stock PSUs and get you a unit that can run a real GPU at a low price.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


thanks, btw, I currently am using 6670 ddr3 (little OC'ed) which I assume, draws 60W. So, this additional 15W for R7 250 is gonna create a load that may harm my psu/gpu or other components?

I think you will be okay with it but getting a better PSU would definitely be a good idea.
14A and 10A are terribly low spec'd rails
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September 13, 2014 3:47:04 PM

smeezekitty said:
naviidsamii said:
hunter315 said:
An R7 250 needs 75W for itself. Your CPU will pull all of its power from the 12V rail as well, any drives and fans will also be pulling the majority of their power from there. 80%+ of a modern computer's power draw is from the 12V rail, the 5V and 3.3V are used for driving a variety of micro controllers throughout the system like in SSDs.

With 2 drives(~10W), a 35W motherboard, and a 65W CPU you need about 195W from the 12V rail, you only have 228W to work with, assuming that your unit can even do its labeled ratings, particularly at raised temperatures. Most cheap/low powered units are rated at 25C and lose 3W/C over their rating.

AKA, your PSU is too weak to support any real discrete GPU, but there are cheap solutions to this problem. Assuming your system uses a normal PSU(HP recently switched back to proprietary ones :/ ) then you can just swap it out for a CX430 for $20, that will give you 32A on the 12V rail. Don't expect the CX430 to support a lot of OCing, its just meant to replace inferior stock PSUs and get you a unit that can run a real GPU at a low price.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


thanks, btw, I currently am using 6670 ddr3 (little OC'ed) which I assume, draws 60W. So, this additional 15W for R7 250 is gonna create a load that may harm my psu/gpu or other components?

I think you will be okay with it but getting a better PSU would definitely be a good idea.
14A and 10A are terribly low spec'd rails


yeah thanks, I get it man, but should I give it a try? :/ 
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Best solution

September 13, 2014 3:54:33 PM

Since you already run a 6670 I bet it will work
but keep in mind you will be reducing the life of the PSU
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September 13, 2014 4:45:13 PM

smeezekitty said:
Since you already run a 6670 I bet it will work
but keep in mind you will be reducing the life of the PSU


I'll try then, and I don't care for my psu.. it's been a shit already. I'm gonna save up money and upgrade psu soon.
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