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Cooler master gx750 enough for msi gtx 670 PE/OC sli and i53570k 4.2ghz?

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September 3, 2013 11:02:03 AM

It's in the title but my specs are:

PSU: Cooler Master GX750
CPU: i5 3570k @ 4.2ghz 1.23v
MOBO: Asus sabertooth z77
RAM: Corsair Dominator Platinum 16Gb
Cooler: Corsair H80i
GPU: ordered 2 MSI GTX 670 PE/OC
HDD: 2to Seagate Barracuda 7200rpm
SDD: 126Go Samsung 800
2 8mm fans, 2 9mm fans, 2 120mm fans, 1 14mm fan.

Thanks in advance
September 3, 2013 11:43:28 AM

generally coolermaster psus are junk. This one is a little better then most, but when you start to push over 600W of draw or get the psu hot, the power becomes junky, and could damage your components.

I would suggest you stick to a more reputable psu company like Corsair, XFX, Antec or Seasonic.
September 3, 2013 12:06:25 PM

You’ll need more power, especially with 2 670s in SLI. Your build is similar to mine, and I would not dare to risk less than 1000w. Check out this power supply calculator: http://support.asus.com/PowerSupply.aspx



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i7 3770K OC @ 4.2Ghz / ASRock Extreme 4 Z77 / evga FTW 670 2X-SLI / Creative SB Audigy SE PCI Sound Card / 32 GB Corsair Vengeance 1600 / 128 GB OCZ Vertex 4 / 2 TB WD Caviar Black / 2 TB Seagate Barracuda / Asetek 510LC Liquid Cooling System / LG 14X Blu-ray R/W / Corsair 1000w PSU / AzzA Genesis 9000 full tower / Windows 7 Professional 64 / 144hz 1ms 24-inch Asus monitor
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September 3, 2013 12:07:34 PM

ingtar33 said:
generally coolermaster psus are junk. This one is a little better then most, but when you start to push over 600W of draw or get the psu hot, the power becomes junky, and could damage your components.

I would suggest you stick to a more reputable psu company like Corsair, XFX, Antec or Seasonic.


Thank you for your answer,

The PSU is sli certified(the sli bridge was included in the package), my doubt is about the overclocked i5 3570k, i will not overclock the gpus further so do i have to underclock my cpu to stock clocks?

It s hard to find answers for this PSU plus i just bought it instead of the corsair tx850 because of the blue prints in the PSU what a dick.

September 3, 2013 12:16:06 PM

ZippyPeanut said:
You’ll need more power, especially with 2 670s in SLI. Your build is similar to mine, and I would not dare to risk less than 1000w. Check out this power supply calculator: http://support.asus.com/PowerSupply.aspx



-----------
i7 3770K OC @ 4.2Ghz / ASRock Extreme 4 Z77 / evga FTW 670 2X-SLI / Creative SB Audigy SE PCI Sound Card / 32 GB Corsair Vengeance 1600 / 128 GB OCZ Vertex 4 / 2 TB WD Caviar Black / 2 TB Seagate Barracuda / Asetek 510LC Liquid Cooling System / LG 14X Blu-ray R/W / Corsair 1000w PSU / AzzA Genesis 9000 full tower / Windows 7 Professional 64 / 144hz 1ms 24-inch Asus monitor


Thanks for your reply,

i did the watt calculator and it gives me a minimum of 850w, guess i ll have to buy a Corsair because i already have other corsair components. But i guess i will try to underclock the cpu and cross my fingers just to see what happens, i have a fire extinguisher under my bed just in case.
September 3, 2013 6:48:58 PM

zepisco83 said:
ZippyPeanut said:
You’ll need more power, especially with 2 670s in SLI. Your build is similar to mine, and I would not dare to risk less than 1000w. Check out this power supply calculator: http://support.asus.com/PowerSupply.aspx



-----------
i7 3770K OC @ 4.2Ghz / ASRock Extreme 4 Z77 / evga FTW 670 2X-SLI / Creative SB Audigy SE PCI Sound Card / 32 GB Corsair Vengeance 1600 / 128 GB OCZ Vertex 4 / 2 TB WD Caviar Black / 2 TB Seagate Barracuda / Asetek 510LC Liquid Cooling System / LG 14X Blu-ray R/W / Corsair 1000w PSU / AzzA Genesis 9000 full tower / Windows 7 Professional 64 / 144hz 1ms 24-inch Asus monitor


Thanks for your reply,

i did the watt calculator and it gives me a minimum of 850w, guess i ll have to buy a Corsair because i already have other corsair components. But i guess i will try to underclock the cpu and cross my fingers just to see what happens, i have a fire extinguisher under my bed just in case.


understand most WATT calculators really overestimate the amount of power you need. In your case that's a maximum of a 250W gpu when overclocked and under full load. 500W total for SLi, and an i5-3570k will at most pull 220-250W when overclocked and under load. So that's a 700-750W draw system in a worst case max overclock 100% system load scenario.

You should be fine with a certified bronze 80% 800W psu.

my concern was only for the coolermaster you were looking at, they tend to make crappy psus, and while that one isn't the worst one they make, it's still not particularly of good.
September 4, 2013 1:47:31 PM

ingtar33 said:
zepisco83 said:
ZippyPeanut said:
You’ll need more power, especially with 2 670s in SLI. Your build is similar to mine, and I would not dare to risk less than 1000w. Check out this power supply calculator: http://support.asus.com/PowerSupply.aspx



-----------
i7 3770K OC @ 4.2Ghz / ASRock Extreme 4 Z77 / evga FTW 670 2X-SLI / Creative SB Audigy SE PCI Sound Card / 32 GB Corsair Vengeance 1600 / 128 GB OCZ Vertex 4 / 2 TB WD Caviar Black / 2 TB Seagate Barracuda / Asetek 510LC Liquid Cooling System / LG 14X Blu-ray R/W / Corsair 1000w PSU / AzzA Genesis 9000 full tower / Windows 7 Professional 64 / 144hz 1ms 24-inch Asus monitor


Thanks for your reply,

i did the watt calculator and it gives me a minimum of 850w, guess i ll have to buy a Corsair because i already have other corsair components. But i guess i will try to underclock the cpu and cross my fingers just to see what happens, i have a fire extinguisher under my bed just in case.


understand most WATT calculators really overestimate the amount of power you need. In your case that's a maximum of a 250W gpu when overclocked and under full load. 500W total for SLi, and an i5-3570k will at most pull 220-250W when overclocked and under load. So that's a 700-750W draw system in a worst case max overclock 100% system load scenario.

You should be fine with a certified bronze 80% 800W psu.

my concern was only for the coolermaster you were looking at, they tend to make crappy psus, and while that one isn't the worst one they make, it's still not particularly of good.


Ok so I was curious about all the talking with psus and wattage and power consumption, and I bought today a wattmeter for 25$. Right now I only have a msi gtx 670 oc reference card and I run some tests. Now according to Cooler Master the gx750 as 720w in the 12v rail and 60A, that s not bad. First test: OCCT PSU test CPU load at 100% and GPU load also at 100% at the same time for 15min the max wattage given by the wattmeter was 290w.
2nd test I played for an hour train simulator 2013 and the max wattage was of 230w. Because I was skeptical about the wattmeter results I test it with other devices and the results were pretty accurate with the specs announced by the manufacturer. My question is, aren t you overestimating the power needed for an sli plus CPU oc? Or a second card will pull an absurd amount of power like 300w more? Understand that I am not saying you re wrong and i respect everyone's opinion and I honestly appreciate constructive replies. It s just I read so many different opinions about the wattage needed, that I thought the best way to,know more about it was to see and test by myself. I will post the results for the sli wattage when I get the cards, maybe someone else is interested to know.
Again thanks for your input.
September 4, 2013 6:37:00 PM

of course i'm overestimating. i'm taking the max power draw for the parts from a number of respected reviewers, under an overclock and adding like 50W to it. Mostly because there is OTHER stuff in your system that draws power. My point was even using my own massive overestimation of the power draw of your build i'm still 100W lower then most Watt calculators.

Worst case with the most extreme overclock imaginable, under 100% load your system might draw as much as 700W-750W. so an 800W psu would likely be more psu then you could possibly use, in short it's enough... more then enough really.
September 12, 2013 5:59:57 AM

After a few days of testing, the gx750 is handling well.
I had no problems to install the cards and they re running well, a lit bit hot because my case is not very bog(zalman z11 plus)
Now the tests vsync off, Crysis 3, Far cry 3, Empire total war, train simulator 2013, Metro 2033, Hitman Absolution, all between 480w and 530w. Unigine Heaven 3.0 530w, 3dmark 11 517w, OCCT psu stress test 100% load both CPU and GPU 580w.
usually use vsync around 72fps(144 hz monitor) to keep confortable gpu temps around 60 to 70 degrees Celsius, so when gaming I never go higher than 480w. To close the discussion, the gx750 80plus bronze certified and sli ready is giving me enough power to my satisfaction. So probably a very good 650w psu should be enough for an sli system with an overclocked CPU.
Thank's for the replies.
September 12, 2013 9:58:04 AM

glad to hear it worked for you! :D 
!