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PSU to power a pair of GTX 780 Superclocked and an overclocked i5 2500k

Hello,

I really need a help here to check if my current PSU can sustain the updates to my current rig:

Currently my PSU is the XFX 850W 80 Plus Bronze.

This psu is powering:
- i5 2500k @ stock 3.2Ghz
- a single Evga GTX 680 FTW 4Gb
- 1 ssd, 2 hdds and a dvd

But I am selling the single GTX 680 and already purchased two Evga GTX 780 Superclocked.
And I plan to overclock my i5 2500k to ~ 4.3Ghz, so my system will be:
- i5 2500k @ 4.3Ghz (overclocked)
- two Evga GTX 780 Superclocked (SLI'ed)
- 1 ssd, 2 hdds and a dvd

Will my 850W psu be enough to power this rig?
I am tempting to get the Corsair AX1200, but only if I really need to.

I saw here that these guys were able to check that a system like this would draw 773W under their testing, but I don't know if my cpu overclock would require even more:
http://www.tweaktown.com/articles/5508/evga-geforce-gtx...

Thanks in advance.
11 answers Last reply Best Answer
More about psu power pair gtx 780 superclocked overclocked 2500k
  1. they were using an i7 3930x EE overclocked in their test, i imagine yours wont be drawing more than that system would be.
  2. Should be fine. Solid power supply. PCs don't draw near as much power as they used too, especially the newest cpus and gpus.
  3. I'd update the power supply. First of all you shouldn't be near the max power rating of your supply. Will have problems as you overclock etc.

    Your 850W Bronze, if providing 800W will be burning 176 watts. Just think of it, 176 watts, that's almost two 100W light bulbs of wasted power dumped right into your rig.

    Shoot for a 1000W Platinum. That will be wasting about 89 watts. Just half of the wasted power of your Bronze. And it will give you some headroom. I'm not too sure of the 1200W supplies, because that's the power rating of your power socket you are plugging into.
  4. babernet_1 said:
    I'd update the power supply. First of all you shouldn't be near the max power rating of your supply. Will have problems as you overclock etc.

    Your 850W Bronze, if providing 800W will be burning 176 watts. Just think of it, 176 watts, that's almost two 100W light bulbs of wasted power dumped right into your rig.

    Shoot for a 1000W Platinum. That will be wasting about 89 watts. Just half of the wasted power of your Bronze. And it will give you some headroom. I'm not too sure of the 1200W supplies, because that's the power rating of your power socket you are plugging into.


    Good point about the 176 watts burned. I have not yet really understood this classification of Bronze / Gold / Platinum until now.
    But it does make sense! Thanks for the info!

    Would you recommend a 1000W Platinum one able to power two GTX 780 SC in SLI? I know I just cannot choose any because there are some requirements such as:
    - minimum +12 Volt current rating of 42 Amps;
    - available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector (times two, as they will be a pair of vgas)
  5. bsbuser said:
    babernet_1 said:
    I'd update the power supply. First of all you shouldn't be near the max power rating of your supply. Will have problems as you overclock etc.

    Your 850W Bronze, if providing 800W will be burning 176 watts. Just think of it, 176 watts, that's almost two 100W light bulbs of wasted power dumped right into your rig.

    Shoot for a 1000W Platinum. That will be wasting about 89 watts. Just half of the wasted power of your Bronze. And it will give you some headroom. I'm not too sure of the 1200W supplies, because that's the power rating of your power socket you are plugging into.


    Good point about the 176 watts burned. I have not yet really understood this classification of Bronze / Gold / Platinum until now.
    But it does make sense! Thanks for the info!

    Would you recommend a 1000W Platinum one able to power two GTX 780 SC in SLI? I know I just cannot choose any because there are some requirements such as:
    - minimum +12 Volt current rating of 42 Amps;
    - available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector (times two, as they will be a pair of vgas)



    Yes, I am in the process of updating my computer, two Titans and a 4770K, all overclocked. I plan on a 1000W supply. This new supply has caught my attention. It is only Gold rated, but is just a percent or so below Plantinum, however, it has very high efficiency at low power levels, more so than Plantinums and at these levels is where our supplies are the most.

    http://www.techpowerup.com/reviews/CoolerMaster/V1000/1.html
  6. babernet_1 said:
    bsbuser said:
    babernet_1 said:
    I'd update the power supply. First of all you shouldn't be near the max power rating of your supply. Will have problems as you overclock etc.

    Your 850W Bronze, if providing 800W will be burning 176 watts. Just think of it, 176 watts, that's almost two 100W light bulbs of wasted power dumped right into your rig.

    Shoot for a 1000W Platinum. That will be wasting about 89 watts. Just half of the wasted power of your Bronze. And it will give you some headroom. I'm not too sure of the 1200W supplies, because that's the power rating of your power socket you are plugging into.


    Good point about the 176 watts burned. I have not yet really understood this classification of Bronze / Gold / Platinum until now.
    But it does make sense! Thanks for the info!

    Would you recommend a 1000W Platinum one able to power two GTX 780 SC in SLI? I know I just cannot choose any because there are some requirements such as:
    - minimum +12 Volt current rating of 42 Amps;
    - available 6-pin PCI-E power connector and an available 8 pin PCI-E power connector (times two, as they will be a pair of vgas)



    Yes, I am in the process of updating my computer, two Titans and a 4770K, all overclocked. I plan on a 1000W supply. This new supply has caught my attention. It is only Gold rated, but is just a percent or so below Plantinum, however, it has very high efficiency at low power levels, more so than Plantinums and at these levels is where our supplies are the most.

    http://www.techpowerup.com/reviews/CoolerMaster/V1000/1.html


    Really?

    I found this Cooler Master V-series 1000w at amazon for $180:
    http://www.amazon.com/Cooler-Master-V-Series-Modular-Certification/dp/B00CGY4ETG/ref=sr_1_1?ie=UTF8&qid=1370978895&sr=8-1&keywords=cooler+master+v+series+1000+w

    So much cheaper than the one I was thinking about for $270:
    http://www.amazon.com/Corsair-Professional-Series-Modular-AX1200/dp/B003PJ6QVU/ref=sr_1_1?ie=UTF8&qid=1370978924&sr=8-1&keywords=corsair+ax1200

    Do you really think this one would fit your needs (2 Titans + 4770k overclocked)?

    If so, it would surely meet my rig needs also...
  7. yeah itll definitely meet (and exceed) your needs. i think your current psu would still do the trick, but hes right about it not being super efficient. just depends on if you feel like spending the extra money.
  8. Unless you live in a very high-cost power area, the generally substantial increases in price to go from gold to platinum aren't terribly cost-effective. If you're running a 600W load 24 hours a day, an extremely unusual scenario, you're saving half a kWh a day going from gold to platinum. At average US electricity prices, that's $1.80 or so a month and given the additional cost of platinum, you'll take 1.5-2 years.

    And that's in a completely unrealistic scenario unless you're bitcoin mining. Play Crysis 3 for 16 hours a day, all day, every day, and only sleep and never go to work or leave the PC, and it'll "only" take 2-3 years to recoup the costs. Unless you get a good deal, intentionally searching for a platinum in a low-cost electricity area isn't a great idea.
  9. DSzymborski said:
    Unless you live in a very high-cost power area, the generally substantial increases in price to go from gold to platinum aren't terribly cost-effective. If you're running a 600W load 24 hours a day, an extremely unusual scenario, you're saving half a kWh a day going from gold to platinum. At average US electricity prices, that's $1.80 or so a month and given the additional cost of platinum, you'll take 1.5-2 years.

    And that's in a completely unrealistic scenario unless you're bitcoin mining. Play Crysis 3 for 16 hours a day, all day, every day, and only sleep and never go to work or leave the PC, and it'll "only" take 2-3 years to recoup the costs. Unless you get a good deal, intentionally searching for a platinum in a low-cost electricity area isn't a great idea.


    If I take the "need for super-eficiency" out of the equation, do you think I can keep my current PSU?

    bebernet_1 warned about not beeing to close to the max power the psu can deliver. I am really just concerned about this situation.

    The waste of energy isn't a real concern because this PC will not be kept on-line for much time. I am buying a cheap NUC (intel) or AZBOX AD12/ID83 for the purpose of 24hour on-line for downloading and such things, with minimum power draw.

    My gaming pc will be turned on for gaming moments (like 1-2hour a day at max) and eventual web surfing.

    That being said, do you think I can keep my current PSU (XFX 850W) for the 2-way GTX 780 SC + 2500k overclocked?
  10. Best answer
    bsbuser said:
    DSzymborski said:
    Unless you live in a very high-cost power area, the generally substantial increases in price to go from gold to platinum aren't terribly cost-effective. If you're running a 600W load 24 hours a day, an extremely unusual scenario, you're saving half a kWh a day going from gold to platinum. At average US electricity prices, that's $1.80 or so a month and given the additional cost of platinum, you'll take 1.5-2 years.

    And that's in a completely unrealistic scenario unless you're bitcoin mining. Play Crysis 3 for 16 hours a day, all day, every day, and only sleep and never go to work or leave the PC, and it'll "only" take 2-3 years to recoup the costs. Unless you get a good deal, intentionally searching for a platinum in a low-cost electricity area isn't a great idea.


    If I take the "need for super-eficiency" out of the equation, do you think I can keep my current PSU?

    bebernet_1 warned about not beeing to close to the max power the psu can deliver. I am really just concerned about this situation.

    The waste of energy isn't a real concern because this PC will not be kept on-line for much time. I am buying a cheap NUC (intel) or AZBOX AD12/ID83 for the purpose of 24hour on-line for downloading and such things, with minimum power draw.

    My gaming pc will be turned on for gaming moments (like 1-2hour a day at max) and eventual web surfing.

    That being said, do you think I can keep my current PSU (XFX 850W) for the 2-way GTX 780 SC + 2500k overclocked?




    I think overclocking both the processor and graphics cards will put you at 850W.
  11. babernet_1 said:
    bsbuser said:
    DSzymborski said:
    Unless you live in a very high-cost power area, the generally substantial increases in price to go from gold to platinum aren't terribly cost-effective. If you're running a 600W load 24 hours a day, an extremely unusual scenario, you're saving half a kWh a day going from gold to platinum. At average US electricity prices, that's $1.80 or so a month and given the additional cost of platinum, you'll take 1.5-2 years.

    And that's in a completely unrealistic scenario unless you're bitcoin mining. Play Crysis 3 for 16 hours a day, all day, every day, and only sleep and never go to work or leave the PC, and it'll "only" take 2-3 years to recoup the costs. Unless you get a good deal, intentionally searching for a platinum in a low-cost electricity area isn't a great idea.


    If I take the "need for super-eficiency" out of the equation, do you think I can keep my current PSU?

    bebernet_1 warned about not beeing to close to the max power the psu can deliver. I am really just concerned about this situation.

    The waste of energy isn't a real concern because this PC will not be kept on-line for much time. I am buying a cheap NUC (intel) or AZBOX AD12/ID83 for the purpose of 24hour on-line for downloading and such things, with minimum power draw.

    My gaming pc will be turned on for gaming moments (like 1-2hour a day at max) and eventual web surfing.

    That being said, do you think I can keep my current PSU (XFX 850W) for the 2-way GTX 780 SC + 2500k overclocked?




    I think overclocking both the processor and graphics cards will put you at 850W.


    At full load, maybe. You're not running at full load constantly, however.
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