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PSU 12V voltage - how low is too low

post #1 of 18
Thread Starter 
System is running on a Corsair VS650, this is while mining with a RX480 + 470 (undervolted both, 470 is at 2000Mhz mem), CPU is FX-8320, 225 Base clock, 4.5Ghz (1.4V +0.05V offset), 2.475Ghz CPU-NB (1.3V), HT 2.475Ghz (stock V).

The average is seen there, all CPU power savings are on.

I know that this is out of specification (which accepts +-5% for the 12V, but 10% for the 5V).

While mining with the 470 and playing WarThunder on the 480, i get same minimum voltage, while average stays the same.

Power Consumption from the wall is ~400-450W with current load, in WarThunder its the same. In OverWatch it gets to ~500-520W at wall.

No issues with rebooting or stuff, used to get lots of crashes though on my 960T (oc'ed and unlocked), which could be totally crap CPU, or also just TOO LOW 12V - didnt had the idea to check it.

Is there a minimum voltage, where the PSU shuts off?

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post #2 of 18
http://www.overclock.net/t/1587697/why-you-should-not-buy-a-corsair-vs-thermaltake-smart-se-thermaltake-tr2-challenger
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post #3 of 18
Thread Starter 
Its a 3.5 year old PSU, bought whatever was NOT the cheapest, and NOT the total garbage.

So yea, also, my country should name speaks alot about salaries and electronics costs.
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post #4 of 18
The point was its not very good and not making your system run very well either.
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post #5 of 18
Most PSUs that I've heard of don't really protect against undervoltage, the ATX spec for the 12 volt rail is + or - 5% so max voltage of 12.600v or a minimum voltage of 11.400.

So assuming your sensors are correct you are outside of ATX spec, and should replace the power supply. What kind of budget do you have?

Also http://www.jonnyguru.com is the best source for power supply reviews, in helping with a selection. Seasonic, EVGA, are trading blows as top of the line contenders currently in the PSU market, Newer corsair units seem to be doing quite well as well.
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post #6 of 18
Thread Starter 
Current budget? Really low. I will be probably looking for something in the 50E range at the end of the month (probably, depends how easter goes). And i will rpobably need a 750W one, this one is pushing it at 550W.
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post #7 of 18
Remember to take the rated efficiency of your PSU off any number you get from the wall or a kill a watt
550 watt is not actually 550 watts its somewhere around 450 watt which means a 750 watt is overkill.

Edit: looking at PC stores from Bulgaria i can tell you that there is nothing even remotely decent at 50E
Not even the old Corsair CX430 which is twice your budget

If you want something even remotely decent you have to spend at least twice as much if not 3-4 time as much.
Edited by shilka - 4/10/17 at 10:19am
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post #8 of 18
Thread Starter 
Quote:
Originally Posted by shilka View Post

Remember to take the rated efficiency of your PSU off any number you get from the wall or a kill a watt
550 watt is not actually 550 watts its somewhere around 450 watt which means a 750 watt is overkill.

Edit: looking at PC stores from Bulgaria i can tell you that there is nothing even remotely decent at 50E
Not even the old Corsair CX430 which is twice your budget

If you want something even remotely decent you have to spend at least twice as much if not 3-4 time as much.

Yup, thats the reason i am stuck with a VS :/
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post #9 of 18
Try checking the voltage with a multi-meter, the motherboards sensors tend to have a big error on the 12v line even on high-end boards.
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by lexer View Post

Try checking the voltage with a multi-meter, the motherboards sensors tend to have a big error on the 12v line even on high-end boards.

From what i understand - on a PATA power connector while under load, yellow and black.

Or from 24pin motherboard on shorted PSU?
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