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Will a 750w do?

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June 19, 2012 12:38:29 AM

Hello everyone! I'm thinking about getting some new parts to my computer, and I was wondering if a 750w Corsair would be enough for the following:

MSI P67A-GD55 (B3)
i7-2600K @ 3400MHz
16GB RAM (Kingston HyperX Genesis)
2x MSI R6950 Twin Frozr III
2x 60GB SSD
2TB HDD
Coolink Corator DS
2 case fans
a writing Blu-Ray -drive

Would there be room for overclocking? So would you get a 750w Corsair or a bigger or smaller PSU? And which brand and model would you choose? Thanks in advance!

More about : 750w

a c 150 ) Power supply
June 19, 2012 1:01:54 AM

As long as you have +12V rail(s) that can handle the HD 6950 CF's 27.3A... plus your system's other +12v loads. (usually 5-10A) And as long as the +12V rail(s) wattage rating is 328W plus what's needed for the other +12V loads. (probably less than 100W).
http://www.thermaltake.outervision.com/
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June 19, 2012 2:19:06 AM

clutchc said:
As long as you have +12V rail(s) that can handle the HD 6950 CF's 27.3A... plus your system's other +12v loads. (usually 5-10A) And as long as the +12V rail(s) wattage rating is 328W plus what's needed for the other +12V loads. (probably less than 100W).
http://www.thermaltake.outervision.com/


Thanks a lot!
June 19, 2012 6:46:48 AM

I know a psu like that can handle gtx 570 in SLI perfectly. I'm going to use my 750w seasonic psu for 560 Ti SLI. I believe your psu will handle well, but not sure because you have 2 SSDs and 16GB of RAM.

I calculated you will be using 432~450 watts with what you described, so there is room for overclocking. You can calculate yourself if you want to make sure you get everything. Your psu will do just fine I think.

http://extreme.outervision.com/PSUEngine

Corsair is a top brand, so if you use like 725 watts from it, it will handle perfectly.
a b ) Power supply
June 19, 2012 7:30:52 AM

yep. It'll power it just fine. Now go out there and have some 'fun' with your powerful rig.
June 19, 2012 8:02:38 AM

mazchazo said:
I know a psu like that can handle gtx 570 in SLI perfectly. I'm going to use my 750w seasonic psu for 560 Ti SLI. I believe your psu will handle well, but not sure because you have 2 SSDs and 16GB of RAM.

I calculated you will be using 432~450 watts with what you described, so there is room for overclocking. You can calculate yourself if you want to make sure you get everything. Your psu will do just fine I think.

http://extreme.outervision.com/PSUEngine

Corsair is a top brand, so if you use like 725 watts from it, it will handle perfectly.


Thanks a lot for your time and help, now I know that 750w'll do it just fine, maybe I'll just compare some prices before purchasing, maybe I could get an even more powerful PSU for the future, don't know.
June 19, 2012 8:03:47 AM

lilotimz said:
yep. It'll power it just fine. Now go out there and have some 'fun' with your powerful rig.


Thanks!
June 20, 2012 6:52:11 AM

Sorry I miscalculated. I forgot capacitor aging and system load. If your 2TB HDD is 7200 rpm, with 30% capacitor aging, for 24/7 use, your recommended wattage is calculated to be 724 watts, using a minimum of 666 watts. You'll be fine. I'm sure you would leave your graphics cards in crossfire 24/7 on 100% load. (You can turn crossfire on and off with a utility program, doesn't have to be left on all the time)
June 20, 2012 7:15:09 AM

mazchazo said:
Sorry I miscalculated. I forgot capacitor aging and system load. If your 2TB HDD is 7200 rpm, with 30% capacitor aging, for 24/7 use, your recommended wattage is calculated to be 724 watts, using a minimum of 666 watts. You'll be fine. I'm sure you would leave your graphics cards in crossfire 24/7 on 100% load. (You can turn crossfire on and off with a utility program, doesn't have to be left on all the time)


Thanks, so which PSU would you recommend me to buy? Would you personally buy a 750w Corsair or would you play safe and also looking forward to the future maybe buy a 850w Corsair that was also mentioned in this thread?
a b ) Power supply
June 20, 2012 8:43:24 AM

capacitor aging is not a big deal on high quality units with japanese cap's. It should not factor into your choice of power supplies other than how much it can safely output on its 12v rail and how high of a quality the unit is.

Both are irrelevant on the TXV2 or HX or AX as all 3 are based on very high quality seasonic units.

Under normal gaming load, you will probably not break 400-450w realistically and maybe topping a tad over 500w. Factor in a hundred or so W for overclocking and miscellaneous and it still well within the power supplies stable outputs. Don't worry about it.
a c 150 ) Power supply
June 20, 2012 7:02:43 PM

The rig in my sig below is plugged into a Kill-A-Watt meter*. Running Furmark 1.10.1 at 1080p, 4XAA, full screen for the benchmark run... it never went above 555W and was mostly in the mid-high 400Ws. Your pair of HD 6950s will draw less than my 2 GTX 570s. Perhaps that will be a helpful comparison.

* Since the Kill-A-Watt meter reads the primary side of the PSU, the actual wattage used by the system will be a bit less do to the power factor value of the PSU.
June 21, 2012 6:34:53 AM

lilotimz said:
capacitor aging is not a big deal on high quality units with japanese cap's. It should not factor into your choice of power supplies other than how much it can safely output on its 12v rail and how high of a quality the unit is.

Both are irrelevant on the TXV2 or HX or AX as all 3 are based on very high quality seasonic units.

Under normal gaming load, you will probably not break 400-450w realistically and maybe topping a tad over 500w. Factor in a hundred or so W for overclocking and miscellaneous and it still well within the power supplies stable outputs. Don't worry about it.


Thanks!
June 21, 2012 6:35:26 AM

clutchc said:
The rig in my sig below is plugged into a Kill-A-Watt meter*. Running Furmark 1.10.1 at 1080p, 4XAA, full screen for the benchmark run... it never went above 555W and was mostly in the mid-high 400Ws. Your pair of HD 6950s will draw less than my 2 GTX 570s. Perhaps that will be a helpful comparison.

* Since the Kill-A-Watt meter reads the primary side of the PSU, the actual wattage used by the system will be a bit less do to the power factor value of the PSU.


This was very helpful, thank you.
June 22, 2012 8:58:26 AM

I'd go with the 750w Corsair just because this will be the only time I will SLI, and then maybe go back to a single card. After that, 5-7 years passed, and I will get a whole new system.

Depends on you.
June 25, 2012 9:21:04 AM

mazchazo said:
I'd go with the 750w Corsair just because this will be the only time I will SLI, and then maybe go back to a single card. After that, 5-7 years passed, and I will get a whole new system.

Depends on you.


Allright, I think I'll take a 750w Corsair, would you recommend buying the modular version?
June 26, 2012 9:31:02 AM

Allrightyright said:
Allright, I think I'll take a 750w Corsair, would you recommend buying the modular version?


If you have enough money to spare for modular, yeah. It is less annoying when building. I have this psu. Seasonic is the #1 brand and SeaSonic also makes Corsair's psu's.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

fully modular^. Be aware 750w psu's have coil whine noise sometimes, a buzzy sound that happens when windows loads, and sometimes when games load. put a video of a guy with it.
http://www.youtube.com/watch?v=1FdCKZ8qaUU

I have coil whine too. I got used to it, plus it happens only when windows loads and maybe when a game loads. Either way Corsair or Seasonic, coil whine will come to you, though it happens less often with Corsair I think.

Edit: Nvm the Seasonic. this corsair one has 10% off. Get it if you have money to spare!
http://www.newegg.com/Product/Product.aspx?Item=N82E168...
June 26, 2012 9:36:50 PM

mazchazo said:
If you have enough money to spare for modular, yeah. It is less annoying when building. I have this psu. Seasonic is the #1 brand and SeaSonic also makes Corsair's psu's.
http://www.newegg.com/Product/Product.aspx?Item=N82E168...

fully modular^. Be aware 750w psu's have coil whine noise sometimes, a buzzy sound that happens when windows loads, and sometimes when games load. put a video of a guy with it.
http://www.youtube.com/watch?v=1FdCKZ8qaUU

I have coil whine too. I got used to it, plus it happens only when windows loads and maybe when a game loads. Either way Corsair or Seasonic, coil whine will come to you, though it happens less often with Corsair I think.

Edit: Nvm the Seasonic. this corsair one has 10% off. Get it if you have money to spare!
http://www.newegg.com/Product/Product.aspx?Item=N82E168...


Thanks a lot!
!