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How much watts I need for my Power supply ASUS GTX 780 and Intel i7 4770K

Alright, so I have been looking around, and the PSU I think I'll get will be a Corsair Professional Series HX850. But I wanted to know if 850watt is to much, or just the right amount i need for this setup.

I also have a WD 1TB black
Adata 128GB SSD
MSI G45 gaming motherboard
8GB of DDR3 1866mhz G.SKILL Ripjaws X Series
Kraken x60 cooler

Is 850watt to much for all of those? Or is that to much? I would like a modular PSU, and what brand would you recommend me for a good PSU?
22 answers Last reply Best Answer
More about watts power supply asus gtx 780 intel 4770k
  1. 550 should be plenty my friend. Got a budget for your PSU.
  2. Nope lol, just want a high quality PSU, and would be good if it was a modular :D for cable management
  3. 200W for the GPU, 100W for the CPU and other bits so in theory, you would be fine with a high-quality 400W PSU if you have no intention of going SLI or adding anything. If you want some headroom for aging and just-in-case minor addons, you might want to aim for 500-650W instead.

    750+W is only necessary if you think you might go SLI.
  4. The Kasafist said:
    550 should be plenty my friend. Got a budget for your PSU.


    Nope lol, I just want a good, and high quality PSU and a modular PSU for cable management ;D
  5. I wouldn't put less than 600w in there. Check out Xfx, Seasonic, OCZ, Pc Power and Cooling, Ultra, and the Corsair non-cx series. Xfx usually has pretty good deals on modular units. Here is a good site for some info: http://www.eggxpert.com/forums/thread/323050.aspx
  6. Best answer
    You can always find this information on the GFX card manufacturers web site

    http://www.geforce.com/hardware/desktop-gpus/geforce-gtx-780/specifications

    Quote:
    Thermal and Power Specs:
    95 C - Maximum GPU Temperature (in C)
    250 W - Graphics Card Power (W)
    600 W - Minimum Recommended System Power (W)
    One 8-pin and one 6-pin - Supplementary Power Connectors


    SO yes, 850 watts is perfect .... 600 watts for system and 1st card, plus 250 for a 2nd card added later in SLI ..... ofcourse if overclocking, Id go bigger. HX859 gets a 10.0 jonnyguru performance rating and has better voltage stability and lower ripple than more expensive AX series
  7. InvalidError said:
    200W for the GPU, 100W for the CPU and other bits so in theory, you would be fine with a high-quality 400W PSU if you have no intention of going SLI or adding anything. If you want some headroom for aging and just-in-case minor addons, you might want to aim for 500-650W instead.

    750+W is only necessary if you think you might go SLI.


    What brand would you recommend for me? Nope, just want a single GTX 780 ;D maybe in the future, but stuff like that is to much for me.
  8. GeForce GTX 780 - On your average system the card requires you to have a 550 Watt power supply unit.I'd recommend http://www.newegg.com/Product/Product.aspx?Item=N82E16817151118
  9. deleted
  10. bigcyco1 said:
    GeForce GTX 780 - On your average system the card requires you to have a 550 Watt power supply unit.I'd recommend http://www.newegg.com/Product/Product.aspx?Item=N82E16817151118


    Looks good, but I'm buying my whole computer from online, but the PSU isn't on the online store. But I think i'll go after a Modular 650Watt PSU. Is there a different brand that is good?
  11. Anonymous said:
    bigcyco1 said:
    GeForce GTX 780 - On your average system the card requires you to have a 550 Watt power supply unit.I'd recommend http://www.newegg.com/Product/Product.aspx?Item=N82E16817151118


    Looks good, but I'm buying my whole computer from online, but the PSU isn't on the online store. But I think i'll go after a Modular 650Watt PSU. Is there a different brand that is good?
    XFX Or CORSAIR HX ,AX
  12. how about this modular PSU? http://www.canadacomputers.com/product_info.php?cPath=33_443&item_id=054111 It's corsair, and it's 650 watts.
  13. Anonymous said:
    how about this modular PSU? http://www.canadacomputers.com/product_info.php?cPath=33_443&item_id=054111 It's corsair, and it's 650 watts.
    That;s o.k. ;)
  14. Swordkd said:
    I wouldn't put less than 600w in there.

    There would be nothing wrong with putting less in there if all PSUs were designed to deliver at least 80% of their rated output power 24/7 for their whole warranty period.

    Unfortunately, many cheap and even not-so-cheap units out there will fail before that even at 50% load so we end up with recommendations usually being around twice the real requirement.
  15. InvalidError said:
    Swordkd said:
    I wouldn't put less than 600w in there.

    There would be nothing wrong with putting less in there if all PSUs were designed to deliver at least 80% of their rated output power 24/7 for their whole warranty period.

    Unfortunately, many cheap and even not-so-cheap units out there will fail before that even at 50% load so we end up with recommendations usually being around twice the real requirement.


    No, usually recommendations are 500w - 850w depending on the graphics card type and possible quantity, and if they plan on overclocking. I think I've seen one example of a higher wattage than 850w being recommended, and a few of lower than 500w. Also, most of the units recommended are at least tier 3 quality(Corsair CX series) and many are tier 2 according to the link I also included in my post.

    For his load, I believe it falls around 450w without actually looking it up, so a 850w with dual graphics and an overclock would work out fine. I didn't account for dual graphics when I made my recommendation because he was already planning on using a single 780.
  16. Swordkd said:
    No, usually recommendations are 500w - 850w depending on the graphics card type and possible quantity, and if they plan on overclocking.

    The thing I was getting at is that quantity is meaningless without sufficient quality to back it up.

    What is the actual wall-power draw from PCs with 2x 780s? Usually 600-650W including PSU losses and at 90% efficiency, this means 540-600W PSU output. Theoretically within a (very-)high-quality 650W PSU's capabilities.
  17. Correct me if I'm wrong though, the efficiency rating doesn't deal with % of it's total rated draw. Meaning, if you have a 600w PSU rated at 85% effieciency, you are only getting 510w, but instead, if you are drawing 600w from the PSU, the PSU is drawing the equivalent of 700w from the outlet. Of course, higher efficiency rated PSU's are usually better(usually), but the minimum that usually gets recommended is Bronze +.

    So even a crap PSU rated at 600w should give you 600w, but your possibility of a catastrophic failure is much, much higher.
  18. Swordkd said:
    Correct me if I'm wrong though, the efficiency rating doesn't deal with % of it's total rated draw. Meaning, if you have a 600w PSU rated at 85% effieciency, you are only getting 510w, but instead, if you are drawing 600w from the PSU, the PSU is drawing the equivalent of 700w from the outlet.

    Seems correct to me. If you are confused, about what I said earlier, you probably misinterpreted it.

    The 600-650W I was quoting as my starting figure is the raw AC power measured at the wall; not a PSU rating nor the PSU output load. What comes out of the PSU is input power x %efficiency (600-650W x ~90%) and that's where my 550-600W range comes from assuming ~90% efficiency. Then I tacked on an extra 50W margin for things like momentary load peaks beyond typical full-load that might not show up on AC-side power measurements which brings my quasi-ideal (perfect except for conversion losses) PSU rating back up to 650W.

    Basically, what I'm saying if that if PSUs had (much) better quality on average, "safety margins" could be rolled back from the currently common 200-400W to 100W.

    As for crap 600W PSUs giving 600W, that is how it should be in theory. In practice however, PSU reviews on JonnyGuru and elsewhere frequently demonstrate that 'crap' PSUs and occasional runt units from some of the better brands/models usually get nowhere near their maximum rating before either:
    1- outputs drift out of specs
    2- *snap* *crackle* *pop*, fireworks and smoke signals
  19. Hey guys i was wondering if you could help me out. I am looking at getting a barebones kit and it comes with a 400 watt power supply and i am looking to run a gtx780ti but not sure what Intel Cpu to get without going over the wattage? thanks
  20. Totalmutation said:
    Hey guys i was wondering if you could help me out. I am looking at getting a barebones kit and it comes with a 400 watt power supply and i am looking to run a gtx780ti but not sure what Intel Cpu to get without going over the wattage? thanks

    400W is pretty low to run a ~300W GPU. Unless you have a really high quality 400W PSU capable of pushing close to 400W out of its 12V rail in there, you will burn it out on short order no matter what CPU you put in there assuming your system ever works at all when under load. If you step down to a GTX770, you may have a reasonable chance of getting away with a 400W PSU.
  21. InvalidError said:
    Totalmutation said:
    Hey guys i was wondering if you could help me out. I am looking at getting a barebones kit and it comes with a 400 watt power supply and i am looking to run a gtx780ti but not sure what Intel Cpu to get without going over the wattage? thanks

    400W is pretty low to run a ~300W GPU. Unless you have a really high quality 400W PSU capable of pushing close to 400W out of its 12V rail in there, you will burn it out on short order no matter what CPU you put in there assuming your system ever works at all when under load. If you step down to a GTX770, you may have a reasonable chance of getting away with a 400W PSU.


    We'll it's and barebones kit with an sfx 450 watt power supply, sorry missed the 50 watts out. I recently watched a video where Linustechtips said you could put a gtx 780 and i7 4770k and not much else. So how close would it be or would down grading to a i5 4670k give me more room?
  22. Totalmutation said:
    We'll it's and barebones kit with an sfx 450 watt power supply, sorry missed the 50 watts out. I recently watched a video where Linustechtips said you could put a gtx 780 and i7 4770k and not much else. So how close would it be or would down grading to a i5 4670k give me more room?

    You should start your own thread instead of hijacking someone else's if you intend to continue this any longer.

    The power draw difference between an i5 and i7 is only ~10W under full load since the only difference between the two is hyperthreading.

    450W gives you a little more breathing room but as I said earlier in this thread, quality is usually a bigger issue than quantity and to get an idea of what sort of quality your included-with-case PSU is, we need at least a brand but preferably its complete model number.
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