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What Size PSU do I need for this build?

Approximate Purchase Date: this week (the closer the better)

Budget Range: around $600...maybe. I live in Hong Kong so prices are different

System Usage from Most to Least Important: gaming, surfing the internet, watching movies

Are you buying a monitor: Yes

Parts to Upgrade: Completely New Build

Do you need to buy OS: Yes. Windows 7 Home Premium or Professional (haven't decided)

Location: Hong Kong. I will buy everything at a computer mall called the Golden Computer Arcade.

Overclocking: Maybe

Crossfire: Maybe

Desired Monitor Resolution: 1920x1080

Additional Comments: I'll be playing Skyrim, Tomb Raider and Witcher 3 on it

Why Are You Upgrading: I'm upgrading from a laptop.

My Planned Build:

Mobo: Asus Z97-A
http://www.newegg.com/Product/Product.aspx?Item=N82E16813132118
Power consumption: 80 - 160W? (I saw wildly varying reviews...)

CPU: Intel Core i5-4670K
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116899
Power Consumption: Stock Idle 79W
Load 132W
Overclocked Idle 96W
Load 162W

GPU: AMD Radeon R9 290
http://www.newegg.com/Product/ProductList.aspx?Submit=ENE&DEPA=0&Order=BESTMATCH&Description=radeon+r9+290&N=-1&isNodeId=1
Power consumption: Idle 87W
Load 381W

RAM: DDR3 1600 8GB
Any good brand: Kingston, Crucial, Corsair, G.SKILL, OCZ, Patriot (Whichever I find cheaper)
Power consumption: around 8W

SSD
Kingston HyperX 3K 240GB
http://www.newegg.com/Product/Product.aspx?Item=N82E16820239046
Power consumption: 2.11 W
or Crucial M500 240GB SATA 2.5-Inch 7mm Internal SSD
or Samsung 840 EVO 250GB 2.5-Inch SSD

HDD
Western Digital Blue 1 TB Desktop Hard Drive: 3.5 Inch, 7200 RPM, SATA 6 Gb/s, 64 MB Cache - WD10EZEX
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236339
Power consumption: 6.8 W

Optical Drive: Asus 24x DVD Burner
http://www.newegg.com/Product/Product.aspx?Item=N82E16827135305
Power consumption: around 20W

+ a few fans inside case, keyboard, mouse and controller

Case: Cooler Master HAF 912 - Mid Tower Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811119233


QUESTION IS HERE
I wasn't able to find out the mobo power consumption and want to plan for overclocking and adding a second r9 290 in the future. What size and brand PSU do you guys recommend for my new build?
15 answers Last reply Best Answer
More about size psu build
  1. people here will tell you to get 500-650w but a psu is a part that you can use in your next pc so I´d recomend a good quality 750-850w, companies like Corsair, XFX, Evga, seasonic
    you´ll pay a few $ more but you won´t be maxing out your psu and it will last longer
  2. A 750W power supply could just about do it, but I'd recommend an 850W unit. As for brands, I generally recommend Antec, Corsair, Seasonic, and XFX. But it's always best to look at reviews for each particular model.
  3. I love PSU talkfest ;)

    This is how it's going to go for you:

    Firstly I recommend you go with a single GPU solution. You are gaming on a 1080p so crossfire or sli will be completely and utterly useless for you ;)

    If you go with a single GPU solution then a really stable 750W 80+ Gold/plat standard with a good brand will be the conservative sweet spot for your build.

    If you really really want to do cross fire then you will need to get yourself a very stable 850W(or above, but be careful about 1000W PSU's as they can be a bit more unstable) so that you can keep up with the power consumption requirements.

    Just as a note, you will need to factor in dead energy from heat loss and eventual degradation of the total wattage output... especially if you are going to have 2 power hungry cards in the one system.

    Go forth and conquer!
  4. That's very poor advice. A 750W 80+ gold or platinum PSU for a single GPU? Why? It's huge overkill and a waste of money.

    And no, you do not need to factor in "dead energy" from heat loss. Power supplies are rated for what they can deliver to components, the energy lost when converting grid AC to the DC rails (12V, 5V etc) is already accounted for. So eg. a power supply rated for 500W at 80% efficiency can safely deliver 500W to the components and would then draw 625W from the wall.
  5. Best answer
    Sakkura said:
    That's very poor advice. A 750W 80+ gold or platinum PSU for a single GPU? Why? It's huge overkill and a waste of money.



    750w is just perfect for a R9 290!!! Anything less would be stupid and wouldn´t save that much money anyway I´d even go with a 850w
    there is no downside in getting a PSU that has 100w more than your system actualy needs give it some headroom
  6. You most certainly need to start at 750W stable. Please don't listen to people that want you to get the smallest PSU possible. Your PSU WILL lose total output capacity at some point and pushing a small PSU to it's limits all the time is a good way to age it much faster than normal.

    If you want, I can really get into a thousand word post about exactly what happens with your PSU and the efficiencies it likes to operate in... but for the time being, just trust me that 750W is where you start. Crossfiring cards will mean 850W and above.
  7. SHADE117 said:
    750w is just perfect for a R9 290!!! Anything less would be stupid and wouldn´t save that much money anyway I´d even go with a 850w
    there is no downside in getting a PSU that has 100w more than your system actualy needs give it some headroom


    An R9 290 has a TDP of 250W. So in this system we'd be looking at a peak power draw of less than 400W from the power supply. And that's an insane peak, from running eg. Prime95 and Furmark at the same time. Realistic usage would never push it that high. That can certainly be handled by a PSU in the 550-600W range, 750W is just overkill and a waste of money. Let alone 850W.
  8. MightyBoyGaming said:
    You most certainly need to start at 750W stable. Please don't listen to people that want you to get the smallest PSU possible. Your PSU WILL lose total output capacity at some point and pushing a small PSU to it's limits all the time is a good way to age it much faster than normal.

    If you want, I can really get into a thousand word post about exactly what happens with your PSU and the efficiencies it likes to operate in... but for the time being, just trust me that 750W is where you start. Crossfiring cards will mean 850W and above.

    Efficiency? With such a hugely oversized power supply, efficiency would go down because the power supply would be operating at a very low load level most of the time. Power supplies are most efficient at 50-60% load.

    It's also ludicrous to suggest 750W for a single R9 290, and then 850W for two in Crossfire. If 750W for a single card was a realistic recommendation, then for two you'd be looking at 1000W+. Because an R9 290 can certainly add more than 100W power draw.
  9. MightyBoyGaming said:
    .
    Efficiency? With such a hugely oversized power supply, efficiency would go down because the power supply would be operating at a very low load level most of the time. Power supplies are most efficient at 50-60% load.



    50% of 750 is 375 so... according to your logic a 750w PSU is just right, 50% of 400 is 200 and 200w will not cut it so like you said the 750w PSU would be most efficiant and a 400w would be running at more than 50-60% and therefore be less efficient.
    So DON´T use the efficiency argument, the way you explained it makes your own point invalid and stupid

    and btw saving 10-20$ on your PSU just so that your 400$ GPU dies is pretty dumb
  10. Wow. Thanks for all the insight guys. I went with an Antec 850W for futreproofing and decided no crossfire since the benefits aren't additive...while the cost is.
  11. SHADE117 said:
    50% of 750 is 375 so... according to your logic a 750w PSU is just right, 50% of 400 is 200 and 200w will not cut it so like you said the 750w PSU would be most efficiant and a 400w would be running at more than 50-60% and therefore be less efficient.
    So DON´T use the efficiency argument, the way you explained it makes your own point invalid and stupid

    and btw saving 10-20$ on your PSU just so that your 400$ GPU dies is pretty dumb

    The system does not run at maximum power draw constantly. In fact most of the time it will be at less than half that. Drawing eg. 100W from a 750W power supply is inefficient; it's below the lowest level they measure at for the 80 Plus rating (20%, ie. 150W for a 750W unit).

    And what's dumb here is suggesting that an R9 290 will "die" from running on eg. a good 600W power supply.
  12. the R9 won't die from a 600W PSU but the PSU in question will have a considerably shorter life span.

    Which is OK if you feel like you will swap it out every few years... but on average you should assume that the members asking for help want their gear to operate without excessive load and to last for many many years.

    When you push a PSU to its upper limits too often it will age it like crazy and increase the chances of a malfunction which could roll onto the other components. Also if a PSU has an excessively high wattage then that comes with it's own issues. Just to reiterate, 750W isn't excessive for this build, perhaps smacking a 1000+W psu wouldn't be recommended.

    The member went with the right choice in the end so meh ;)
  13. MightyBoyGaming said:
    the R9 won't die from a 600W PSU but the PSU in question will have a considerably shorter life span.


    No it won't. It'll be more efficient, so a little less heat is generated inside the PSU. That will make the temperature slightly lower, which will make the capacitors last a bit longer.
  14. how exactly would it be more efficient than a 750Watt stable 80+gold?

    you're acting like the GPU is the ONLY thing that draws power from the PSU and that the mighty 600W PSU will never lose total power output or efficiency over time...

    dude your argument is so flawed it's funny. lol. sure, spend thousands on a machine and backbone it with a $30 crud psu... totes sounds legit. ;)
  15. MightyBoyGaming said:
    how exactly would it be more efficient than a 750Watt stable 80+gold?

    you're acting like the GPU is the ONLY thing that draws power from the PSU and that the mighty 600W PSU will never lose total power output or efficiency over time...

    dude your argument is so flawed it's funny. lol. sure, spend thousands on a machine and backbone it with a $30 crud psu... totes sounds legit. ;)


    1. By running in its optimal performance range while the overkill PSU runs at a very low load level and thus becomes much less efficient. Remember that the 80 Plus certification only tests at 20%, 50%, and 100% load. Below 20% the efficiency can drop significantly.

    2. I'm acting like the GPU is the only thing that draws power? Yeah, that's why I took the 250W TDP of the graphics card and added the TDP of the CPU and an estimated wattage for the rest of the system...

    3. I never said you should get a $30 power supply. Just that a $110+ unit is overkill. I recommended a quality power supply from eg. Antec, Corsair, Seasonic, or XFX, with an appropriate wattage.
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