Solved

Do I Need More Wattage?

What's up guys? So I am planning on building my first real gaming PC. It's gonna be a Sapphire 6870 w/ an i5 2500k. (3.3ghz) My question to you guys is, do I need to get more wattage on my PSU if I want to Crossfire the 6870s? I currently have this 600w PSU - http://www.newegg.com/Product/Product.aspx?Item=N82E16817171039

Think that will be enough for Crossfire? I am spending 720 dollars on the rig already and don't want to spend much more. Thanks!
16 answers Last reply Best Answer
More about wattage
  1. Many will recommend 750W - but you need a good quality psu - CoolerMaster does not have a good rep for psus.
    Go antec, corsair, seasonic, silverstone, xfx....
    -Bruce
  2. I can't tell if I'm blind or not, but I can't find the Amps on the +12v rail...

    I agree with dish_moose's recommendation of PSU's, however. I would also recommend at least 750w from a QUALITY company. Some of Cooler Master's PSU's have iffy quality, unfortunately.
  3. dish_moose said:
    Many will recommend 750W - but you need a good quality psu - CoolerMaster does not have a good rep for psus.
    Go antec, corsair, seasonic, silverstone, xfx....
    -Bruce


    Here are a few I am looking into. What do you recommend. I am really looking for a good priced one rather than a really good one. I understand cheap PSUs lead to problems. I'm not gonna OC anything, just Crossfire the 6870s.

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371051

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817148040 ($65! 700w and by APEVIA tho)
  4. Best answer
  5. Best answer selected by Taznar.
  6. mocchan said:


    Thanks! I think I am going with the MK II because it comes with a free DVD Burner so it saves me money on that. Just to confirm, the DVD Burner = same as DVD ROM drive?

    Link to it. http://www.newegg.com/Product/Product.aspx?Item=N82E16817703027
  7. Taznar said:
    Thanks! I think I am going with the MK II because it comes with a free DVD Burner so it saves me money on that. Just to confirm, the DVD Burner = same as DVD ROM drive?

    Link to it. http://www.newegg.com/Product/Product.aspx?Item=N82E16817703027


    Yes, it's the same thing :)

    It will burn/read/write DVD's and CD's.
  8. Taznar said:
    What's up guys? So I am planning on building my first real gaming PC. It's gonna be a Sapphire 6870 w/ an i5 2500k. (3.3ghz) My question to you guys is, do I need to get more wattage on my PSU if I want to Crossfire the 6870s? I currently have this 600w PSU - http://www.newegg.com/Product/Product.aspx?Item=N82E16817171039

    Think that will be enough for Crossfire? I am spending 720 dollars on the rig already and don't want to spend much more. Thanks!


    same price as your cooler master (including shipping) and uses a seasonic platform to deliver 48a on the 12v rail (powers your CPU & GPU) which is more then your cooler master can provide

    so it meets your budget unlike some other people here who almost doubled it

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371031
  9. mocchan said:
    Yes, it's the same thing :)

    It will burn/read/write DVD's and CD's.

    Thanks! Best Answer. I once ruined my computer when I was 9 when I OCed the CPU too much, so I definitely needed your help considering I am kinda a noob to PCs. I feel like I am pretty smart about them for 13 though. I am gonna feel so good about myself once I build it too! lol.
  10. ct1615 said:
    same price as your cooler master (including shipping) and uses a seasonic platform to deliver 48a on the 12v rail (powers your CPU & GPU) which is more then your cooler master can provide

    so it meets your budget unlike some other people here who almost doubled it

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371031

    Well I would have got that but that is only 620w and according to these guys 750 is good. Plus I looked at the Power Supply Guide thing here and it says that 600w is the minimum anyone should go for 6870s Crossfired. Plus with the one I chose it only bumps my price about 10 dollars because it has a free DVD Burner, which means I can take out the one I already had and save money there, plus my old DVD Drive didn't have a DVD Burner on it. So this is kinda saving me money in a way. Thanks for the answer though.
  11. ct1615 said:
    same price as your cooler master (including shipping) and uses a seasonic platform to deliver 48a on the 12v rail (powers your CPU & GPU) which is more then your cooler master can provide

    so it meets your budget unlike some other people here who almost doubled it

    http://www.newegg.com/Product/Product.aspx?Item=N82E16817371031

    Plus I might have room for a minor OC on the CPU if I stay with the 750w.
  12. Taznar said:
    Well I would have got that but that is only 620w and according to these guys 750 is good. Plus I looked at the Power Supply Guide thing here and it says that 600w is the minimum anyone should go for 6870s Crossfired. Plus with the one I chose it only bumps my price about 10 dollars because it has a free DVD Burner, which means I can take out the one I already had and save money there, plus my old DVD Drive didn't have a DVD Burner on it. So this is kinda saving me money in a way. Thanks for the answer though.


    the PC&P 750w will do the job no problem, its a good pick.

    as far as total power use though, with two 6870's in CF your total power use under stress will be under 450w

    Measured power consumption two 6870 cards

    System in IDLE = 184W
    System Wattage with GPU in FULL Stress = 421W
    Difference (GPU load) = 237W
    Add average IDLE wattage x2 ~ 19W (ATI specified)
    Subjective obtained GPU power consumption = ~ 275 Watts


    http://www.guru3d.com/article/radeon-hd-6850-6870-crossfirex-review/4
  13. ct1615 said:
    the PC&P 750w will do the job no problem, its a good pick.

    as far as total power use though, with two 6870's in CF your total power use under stress will be under 450w

    Measured power consumption two 6870 cards

    System in IDLE = 184W
    System Wattage with GPU in FULL Stress = 421W
    Difference (GPU load) = 237W
    Add average IDLE wattage x2 ~ 19W (ATI specified)
    Subjective obtained GPU power consumption = ~ 275 Watts


    http://www.guru3d.com/article/radeon-hd-6850-6870-crossfirex-review/4

    I was about to choose yours after reading this until I saw:
    Quote:
    The methodology: We have a device constantly monitoring the power draw from the PC. WE SIMPLY STRESS THE GPU, NOT THE PROCESSOR. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.
    Am I misunderstand you? 450w for the GPU only. But how much would the processor add up to? I would immediately go with the PSU you recommended if the one I had didn't come with DVD Burner. 10 dollars more for an extra 150w is a pretty good bargain in my eyes. It seems like every time I ask a question concerning a PSU someone says that what I have is way too little and I need more, then another says I have enough. But it is always good to have a little extra.
  14. Power consumption

    Lets have a look at how much power draw we measure with these graphics cards installed.

    The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.

    Our test system is based on a power hungry Core i7 965 / X58 based. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, cooling, additional cold cathode lights etc.


    they run a stress test to push the GPUs, they don't stress the CPU as much but still its running at a good level and is OC to begin with. So the 421w is for the whole PC, the GPUs pull 275w. In gaming, your figure would be less then a stress test.

    here is another test for you (furmark) and legitreviews gets just under 450w total power also
  15. ct1615 said:
    Power consumption

    Lets have a look at how much power draw we measure with these graphics cards installed.

    The methodology: We have a device constantly monitoring the power draw from the PC. We simply stress the GPU, not the processor. The before and after wattage will tell us roughly how much power a graphics card is consuming under load.

    Our test system is based on a power hungry Core i7 965 / X58 based. This setup is overclocked to 3.75 GHz. Next to that we have energy saving functions disabled for this motherboard and processor (to ensure consistent benchmark results). On average we are using roughly 50 to 100 Watts more than a standard PC due to higher CPU clock settings, cooling, additional cold cathode lights etc.


    they run a stress test to push the GPUs, they don't stress the CPU as much but still its running at a good level and is OC to begin with. So the 421w is for the whole PC, the GPUs pull 275w. In gaming, your figure would be less then a stress test.

    here is another test for you (furmark) and legitreviews gets just under 450w total power also
    http://www.legitreviews.com/images/reviews/1445/power_consumption.jpg

    I believe you, I was just wondering if that was for the card ONLY or was that including the CPU. I'm sorry if I am being an idiot right now, I am at a novice rank I would say when it comes to this stuff. Just above a noob. lol. I mean, I would still like to OC the CPU though, so if that is all correct then 750w would be enough for an OC, right?
  16. Taznar said:
    I believe you, I was just wondering if that was for the card ONLY or was that including the CPU. I'm sorry if I am being an idiot right now, I am at a novice rank I would say when it comes to this stuff. Just above a noob. lol. I mean, I would still like to OC the CPU though, so if that is all correct then 750w would be enough for an OC, right?


    enough to OC the CPU, both GPUs and a third 6870 if you wanted.
Ask a new question

Read More

Power Supplies Crossfire Components