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-   -   Power supply adequate? (https://www.overclock.net/forum/31-power-supplies/1724808-power-supply-adequate.html)

bfromcolo 04-23-2019 02:16 PM

Power supply adequate?
 
OK before I burn the house down...I am assembling another cruncher from the parts box for the upcoming Boinc Pentathlon. So for 3 weeks it is going to run 7/24 100% on the CPU and GPUs, stock clocks. After 3 weeks it can go back in the parts bin until the next time, so I am not looking for a purchase recommendation unless its something dirt cheap.

This is what I have to work with:

Mobo - ASUS M5A97 R2.0
CPU - FX-8320
RAM - 4x4G DDR3
GPU1 - EVGA GTX-960 SSC
GPU2 - EVGA GTX-750ti SC
Power Supply - Corsair CX-430
SSD
CM212 with 1 fan
4 120mm case fans

The outer vision calculator is recommending 520W, but my fuzzy logic says 325W should be enough and this should be fine. (CPU - 125, GPU1 - 120, GPU2 - 65, misc other stuff like fans and drives - 15W).


Option 2 -

I could reduce power needs by replacing the 960 with a 950. But the stupid calculator still says I am over. 490W

Which I think is closer to 295W
(CPU - 125, GPU1 - 90, GPU2 - 65, misc - 15W)


Option 3 -

I guess if I really wanted to live dangerously I could use the 960 and 950 together, but I would have to use a power cable adapter and the calculator again says I am way over what I think it would be, 552W

My calc 350W
(CPU - 125, GPU1 - 120, GPU2 - 90, misc - 15W)


I have Kill-a-watt, maybe I'll just screw it together and see what it says. Would I be safe drawing the rated power of the power supply from the wall 430W? It's a bronze 80% rated unit, but its also not exactly new so I don't want to push it.

The Pook 04-23-2019 02:26 PM

I ran a i5 6400 @ 4.5 along with a 1060 and a 950 and folded just fine on a 500w Silverstone SFX-L PSU. Power supply calculators are going to overestimate what you need to account for all the crappy units out there.

430 is cutting it close though. Efficiency does down the drain when you near the max output of a PSU but it shouldn't hurt it.

UltraMega 04-23-2019 02:53 PM

It would be a gamble with how close you'd be cutting it. I would definitely not recommend. It's always best to get more than you need for a power supply on a custom build so you can reuse the power supply later on without being so limited by it.

shilka 04-23-2019 03:00 PM

The CX430 is not very good to say the least
https://www.overclock.net/forum/31-p...500-600-a.html

bfromcolo 04-23-2019 03:26 PM

Quote:

Originally Posted by shilka (Post 27943252)
The CX430 is not very good to say the least
https://www.overclock.net/forum/31-p...500-600-a.html


I know its not great, but it was cheap! And its what was in the parts box. I have owned a number of them and never had a problem, which I know doesn't mean others haven't. Johnny Guru and TPU both wrote OK reviews about it back in the day. Alas the Johnny Guru link seems to be borked.



https://www.techpowerup.com/reviews/Corsair/CX430_V2/


I'll fiddle around with it, even if I have to just run one GPU.



But assume this power supply is 7 years old +/- a year, what would you say was a OK power draw at the wall measured with a Kill-aWatt?



If it was designed to deliver 430W at 80% efficiency, that would be 537.5 W in a perfect world. I was thinking if I kept it <450W I should be good regardless of what mix of components allows that.


I'll take some measurements this evening.

wingman99 04-24-2019 07:19 PM

You should be fine if it is less than 450 watts.

bfromcolo 04-25-2019 05:03 AM

The first configuration I listed is drawing 340 - 360W from the wall running a variety of different projects.



Mobo - ASUS M5A97 R2.0
CPU - FX-8320
RAM - 4x4G DDR3
GPU1 - EVGA GTX-960 SSC
GPU2 - EVGA GTX-750ti SC
Power Supply - Corsair CX-430
SSD
CM212 with 1 fan
4 120mm case fans

wingman99 04-25-2019 09:54 AM

Quote:

Originally Posted by bfromcolo (Post 27945122)
The first configuration I listed is drawing 340 - 360W from the wall running a variety of different projects.



Mobo - ASUS M5A97 R2.0
CPU - FX-8320
RAM - 4x4G DDR3
GPU1 - EVGA GTX-960 SSC
GPU2 - EVGA GTX-750ti SC
Power Supply - Corsair CX-430
SSD
CM212 with 1 fan
4 120mm case fans

80% PSU efficiency means the PC is pulling 288 watts from the PSU. The PSU is plenty safe for running 24/7.


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