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Is SeaSonic Platinum-760W Power Supply sufficient for 290x crossfire (no overclock)? - Page 4

post #31 of 39
Quote:
Originally Posted by TwoCables View Post

If it were me, then I'd just do the most demanding thing with my computer that I do. For me, that would be Crysis 3. What would it be for you? Do that.


It depends on what mode it's in:

http://www.guru3d.com/articles_pages/radeon_hd_6990_review,10.html

With their 6990 in unlocked mode and under full load, their PSU pulled 526W from the wall outlet. That means that their computer was pulling about 473W from the PSU. If I add about 150W for an overclocked mainstream CPU, then that makes the computer pulling 623W from the PSU. The gaming power consumption would be even lower.

Use the calculator again, but this time set System Load to 80%. Also, don't use "Capacitor Aging". That's really only necessary for low-quality PSUs that have low-quality capacitors. You can leave the "TDP" at 90%.
seems like i had it in unlocked mode and didnt even know (I thought it was just a dual bios same speeds, i did buy it second hand though and has been a great card havnt seen the so called driver issues I have seen so many times as every other card i have used has been ffrom nvidia)
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post #32 of 39
Thread Starter 
So what are the tests that I could run to ensure that my 760W psu is suffient for my 290x crossfire system?
post #33 of 39
Quote:
Originally Posted by helios123 View Post

So what are the tests that I could run to ensure that my 760W psu is suffient for my 290x crossfire system?

You can use synthetic benchmarks like Valley and Heaven. You can use the settings found in the threads here . . .

http://www.overclock.net/f/21/benchmarking-software-and-discussion

BF4 will be a good one too as well as other games. Games might be better 'cause they will stress both cpu and gpus.i recommend not oc'ing the gpus. besides . . . the cpu is the one that needs to be oc'ed in this case.
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post #34 of 39
Thread Starter 
I have a 3570k @ 4gz (oc) is that good enough for two 290x cf? Will overclocking the cpu from 3.5 to 4ghz be much of a wattage usage? Also what if I use heaven benchmark and run primetest at the same time would that draw the max possible wattage?
Edited by helios123 - 5/10/15 at 6:42am
post #35 of 39
Quote:
Originally Posted by helios123 View Post

I have a 3570k @ 4gz (oc) is that good enough for two 290x cf? Will overclocking the cpu from 3.5 to 4ghz be much of a wattage usage? Also what if I use heaven benchmark and run primetest at the same time would that draw the max possible wattage?

you can. imo, you can oc the cpu higher and be safe so long as you keep the gpus at stock. you can run those tests and have an app like HWINFO64 to moniotr the 12v. may not be very accurate but it will give you an idea. multimeter will work best but i dont know exactly how it is done.

For 12V the tolerance would be +/- 5%. so, the lower limit should stay at or above 11.4v. here is an example with the cpu highlighted at the first one and the 7950 on the second . . .



you need to keep an eye on the Maximum readings.
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post #36 of 39

You have plenty of power:

 

http://www.guru3d.com/articles_pages/radeon_r9_290x_crossfire_vs_sli_review_benchmarks,4.html

 

With two 290Xs under full load, their PSU pulled 661W from the wall outlet. If their PSU was 90% efficient while pulling 661W from the wall, then that means that their computer pulled 595W from the PSU. If I add up to 150W for your CPU overclocked to 4.5 GHz or more, then that makes the computer pulling 745W from the PSU. The gaming power consumption would be even lower, peaking at around 650-675W. Of course, it would be even lower than that because your CPU isn't overclocked very high (it's only a 200 MHz overclock).

 

Your PSU is an extremely high-end unit that is capable of easily delivering 760W 24/7 if it's ever needed, so you have PLENTY of power, just as long as you leave the 290Xs at stock.

 

So, you don't need to run any tests. Just enjoy your computer.


Edited by TwoCables - 5/10/15 at 2:03pm
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post #37 of 39
Thread Starter 
It seems that I have a problem with a particular game: il2-bos. I play it for maybe 15 mins, by gpu starts throttling and at 84C and after some time my computer reboots without any warning. Does anyone have any idea to see whether the problem is overheating or insufficient PSU? I doubt its the psu cause i've fun benchmark + memtest for 1 hour at same time and had no computer problem, shouldn't that be the max watt draw of psu? This problem is very puzzling coz other games I can run fine. Any ideas?
post #38 of 39
Quote:
Originally Posted by TwoCables View Post

It's more than enough:

http://www.guru3d.com/articles_pages/radeon_r9_290x_crossfire_vs_sli_review_benchmarks,4.html

With two R9 290Xs under full load, their system pulled 661W from the wall outlet. Their CPU wasn't loaded very heavily during this test, so I should add around 80W for your CPU. So, that makes the PSU pulling 741W from the wall outlet. This means that if the PSU were 90% efficient while pulling 741W from the wall, then the computer is pulling about 667W from the PSU. This is unrealistically high though because the gaming power consumption would be a little lower, peaking at maybe 600-650W.

The 760W SeaSonic Platinum is a very high-end PSU that's capable of delivering 760W 24/7 very easily if it's ever required. So, delivering about 600-650W for gaming would be a cakewalk for it.
Add in all the fans and drives and OC's ,and I wouldn't do it. I used a 750W in my last build and I regretted it for 2 years. I would go less than 850W Gold for 2-290X's and all the other goodies,and that is a close call still. Those AMD cards are Power hungry.JMHO.
post #39 of 39
Quote:
Originally Posted by helios123 View Post

It seems that I have a problem with a particular game: il2-bos. I play it for maybe 15 mins, by gpu starts throttling and at 84C and after some time my computer reboots without any warning. Does anyone have any idea to see whether the problem is overheating or insufficient PSU? I doubt its the psu cause i've fun benchmark + memtest for 1 hour at same time and had no computer problem, shouldn't that be the max watt draw of psu? This problem is very puzzling coz other games I can run fine. Any ideas?

 

I don't know AMD, but that could be caused by the heat. If you want to be sure though, then a wall meter like the Kill A Watt is fortunately always very affordable and I do recommend buying one just for peace of mind and to see if you can truly rule out the PSU. If you do buy one, then plug just the PSU into it and multiply whatever reading you get by .90% to estimate for 90% efficiency and .95 for 95%. This will give you an idea of how much power your computer is likely pulling out of the PSU, and thus how much of the continuous capacity is being used.

 

Quote:
Originally Posted by cutty1998 View Post


Add in all the fans and drives and OC's ,and I wouldn't do it. I used a 750W in my last build and I regretted it for 2 years. I would go less than 850W Gold for 2-290X's and all the other goodies,and that is a close call still. Those AMD cards are Power hungry.JMHO.

 

Why does it have to be a Gold-rated PSU?

 

Also, I stand by what I said. Should we have him buy a Kill A Watt to prove that his PSU is enough?

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It's a computer!
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Hard DriveHard DriveHard DriveOptical Drive
250 GB Samsung 840 EVO (C:\) 250 GB Samsung 840 EVO (D:\) 150 GB WD VelociRaptor Samsung SH-S243N 24x DVD Burner 
Optical DriveCoolingOSMonitor
Samsung SH-S203N 20X DVD Burner Thermaltake Frio Win 7 Home Premium x64 SP1 Retail AOC G2460PG (24" 1920 x 1080 144Hz G-SYNC) 
KeyboardPowerCaseMouse
Filco Majestouch 104-key Cherry MX Blues w/NKRO Corsair HX650 (Bronze, ordered on 12-12-2009) CM 690 Intellimouse Optical (1.1A) 1000Hz polling rate 
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