Which PSU needed for R9 270X?

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PlutonArioch

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Aug 10, 2015
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So I have recently asked if I could add a R9 270X to my PC, and got the answer, "no the psu can not safely provide enough power". But no one would tell me why, or what PSU I need. So I try again to get an answer (my chance to get the R9 is over in a few days).
Here is my PC:
PSU: 420W Rhombutech RT-420
CPU: AMD A8 7600 (65W)
RAM: 2x4Gb Kingston 1600
Storage: 2x2TB Western Digital WD20EZRX
DVD: LG GH24NS

Now, pcpartpicker.com says the whole setup with the R9 would need only 344W. My questions now are:
Why can a 420W PSU not provide 344W?
What PSU would I need to get 344W provided?
And how can I determine that the next time without asking someone else?
 
Solution
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The psu is probably built with cheap components. On the 12V rails, it states it would only provide up to around 360W which still isn't good for the build. You don't want to get a psu that just power enough for the build, you do want some headroom so you don't stress the power supply. Plus the R9 270X requires your psu to have two 6 pin PCIE power plugs from your power supply.
A decent 550W is enough for most single graphic card builds. If the power supply does not have enough pcie power plugs for the build, it is a good idea to avoid it. Stick to quality psu brands/ manufacturers such as Seasonic, XFX or Superflower.
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Suztera

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The psu is probably built with cheap components. On the 12V rails, it states it would only provide up to around 360W which still isn't good for the build. You don't want to get a psu that just power enough for the build, you do want some headroom so you don't stress the power supply. Plus the R9 270X requires your psu to have two 6 pin PCIE power plugs from your power supply.
A decent 550W is enough for most single graphic card builds. If the power supply does not have enough pcie power plugs for the build, it is a good idea to avoid it. Stick to quality psu brands/ manufacturers such as Seasonic, XFX or Superflower.
 
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Solution
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PlutonArioch

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Aug 10, 2015
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Ok now we are getting somewhere, thank you! Where does it state that? I did not find any more detailed information on the PSU.

Ok, headroom is good, but is it necessary? And how much is necessary? (tight budget)
About the connector, yes I know it needs an additional one. I thought I could get an adapter for it. I take it that is not a good idea then?
The thing is, I already have the PSU. Its been in use for about 13 years (its old I know... but its still running). The question is not if I should buy that one, but do I need to replace it. That seems to be the case.
Allright 550W you say. I am sure thats enough but is it needed? Would a (quality) 500W or even 450W not suffice? And if so: why?

Sorry for the ammount of questions, I am just trying to understand as much as possible, so I can make the best decisions. ;)
 
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Suztera

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I would replace it if it's that old. To my knowledge, there isn't a decent quality 500W psu. There is a 520W Seasonic S12II model. You could use adapters but it still means that your psu isn't really fit to be used for that graphic card.

There is a sticker on the psu stating how many amps there are on the 12V rails. it adds up to roughly 29A. 29 X12 = 348W not including aging capacitors.
 
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PlutonArioch

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Aug 10, 2015
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Thank you very much!
I will stick to the gtx 750 Ti then for now, and try to upgrade the PSU to 550W next, before anything else.


Indeed there is. Allright, I know what to look for then. :)
Thanks again.
 
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