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post #891 of 22311
Quote:
Originally Posted by Faster_is_better View Post

Is a 750w good enough for tri-fire? Specifically this PSU
Depends what graphics cards, I'd say go a little higher to be on the safe side IMO.
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post #892 of 22311
Thread Starter 
Quote:
Originally Posted by cam51037 View Post

What makes you say that it will be worth a lot?

I'm guessing, based on the fact that it's SO DARN HARD to mine, no gpu miner, blocks seem almost random...people with servers and multiple 16 core cpus are getting the same as folks with an i3 laptop...

Guide:
https://bitcointalk.org/index.php?topic=252944.msg2690678#msg2690678
Quote:
Originally Posted by Faster_is_better View Post

Is a 750w good enough for tri-fire? Specifically this PSU

Quote:
Originally Posted by Magical Eskimo View Post

Depends what graphics cards, I'd say go a little higher to be on the safe side IMO.

Perfectly fine for mining, thing is undervolt cpu and cards...don't overclock cpu or use 100% on everything and it'll be fine.
3x7950s is doable with 1.1v and underclocked/volted cpu.
post #893 of 22311
Quote:
Originally Posted by Faster_is_better View Post

Is a 750w good enough for tri-fire? Specifically this PSU

You need atleast 80 amps on the 12v rail for tri fire 7950s.

Or I'd have 4 on my main systyem which is using anax 1200 which has a 100 amp 12v rail.
    
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post #894 of 22311
Thread Starter 
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139006

That thing runs 3 cards mining just fine...don't mine with cpu at the same time though.
For regular usage 2x7970s oced and oced cpu is fine too.
post #895 of 22311
Till it blows up.

3 7950s can pull 1000 watts by themselves let alone the rest of the system.

I pull almost 1100 watts with my system... Or I'd have 4 7950s not 3 .

I would not suggggest a risky psu tyo somebody a minimum of 1000 watts and 80 amps on the 12 v rail or your playing with fire.


This is the instance better safe then sorry cannot be stressed more.... Most people do not monitor there systems while mining... Or like me i leave them mining some times 20 hrs plus with out checking on them.

Going with not enough amps and the psu explodes and causes a house fire while ur away is 110% not worth saving 50$ ..

I cannot stress the importance of this enough... Not only for your safety but the safety of your family and your neighbors .... Spend the extra 50 bucks.
    
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post #896 of 22311
Thread Starter 
Quote:
Originally Posted by Hokies83 View Post

Till it blows up.

3 7950s can pull 1000 watts by themselves let alone the rest of the system.

I pull almost 1100 watts with my system... Or I'd have 4 7950s not 3 .

I would not suggggest a risky psu tyo somebody a minimum of 1000 watts and 80 amps on the 12 v rail or your playing with fire.


This is the instance better safe then sorry cannot be stressed more.... Most people do not monitor there systems while mining... Or like me i leave them mining some times 20 hrs plus with out checking on them.

Going with not enough amps and the psu explodes and causes a house fire while ur away is 110% not worth saving 50$ ..

I cannot stress the importance of this enough... Not only for your safety but the safety of your family and your neighbors .... Spend the extra 50 bucks.

No, 1.1v 7950 draws 190w or less...oced to 1000/1500mhz.
For dedicated miners you use the bare minimum, after all you're after profit. That psu won't blow up, it can output a fair bit more than 750w too. thumb.gif
Also, the 12v rail has 62a, plenty of power for 3x200w cards and 148w spare for ram and cpu, oh and a pendrive with BAMT linux.
You watercool your rigs man, that's not cost effective at all.
post #897 of 22311
It's risky and stupid.

I've had a Gpu that could only pull 350 watts blow up a 600 watt psu.

And I can tell you un monitored it would have burned my house down i had to throw water on my wall.

Mining rigs even more so then gaming rigs need the extra gap to allow for safety.

Gaming your there at your pc mining you are not.

Not worth saving 50 bucks risking your safety and the safety of others.

And me buying. Water cooling with miningg profits is my own concern.

I am also a firm believer of a electronic device draws less power being ran much cooler then it does running hotter... So in the longg run the water cooling returns its investment.
    
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post #898 of 22311
Quote:
Originally Posted by ivanlabrie View Post

No, 1.1v 7950 draws 190w or less...oced to 1000/1500mhz.
For dedicated miners you use the bare minimum, after all you're after profit. That psu won't blow up, it can output a fair bit more than 750w too. thumb.gif
Also, the 12v rail has 62a, plenty of power for 3x200w cards and 148w spare for ram and cpu, oh and a pendrive with BAMT linux.
You watercool your rigs man, that's not cost effective at all.
But if you take it safe and spend an extra $20-$50 on a PSU that is going to be guaranteed safe you're saving yourself the potential hassle of going through insurance claims of a burnt down house, and also losing whatever was in your house when it started on fire.

Personally I'd rather be safe and spend the extra bit of money for a safer system.
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post #899 of 22311
Quote:
Originally Posted by Hokies83 View Post

Till it blows up.

3 7950s can pull 1000 watts by themselves let alone the rest of the system.

I pull almost 1100 watts with my system... Or I'd have 4 7950s not 3 .

I would not suggggest a risky psu tyo somebody a minimum of 1000 watts and 80 amps on the 12 v rail or your playing with fire.


This is the instance better safe then sorry cannot be stressed more.... Most people do not monitor there systems while mining... Or like me i leave them mining some times 20 hrs plus with out checking on them.

Going with not enough amps and the psu explodes and causes a house fire while ur away is 110% not worth saving 50$ ..

I cannot stress the importance of this enough... Not only for your safety but the safety of your family and your neighbors .... Spend the extra 50 bucks.


7950's shouldn't use that much. Are you measuring that between the wall and the p/s? That will always read higher, because the p/s draws more power than it provides to the system. Typically about 15% - 20% more if it's a decent p/s.

A single 7950, with a slight overclock at full load will use about 180 Watts. So three of those will be 540 Watts + the rest of the system. Which if everything else is idle, assume the remainder to be around 100 Watts, bringing us to 640Watts. Of course always add 20% as a safety margin, to avoid running the power supply at max all the time. So that's 768Watts. So that means a 750W p/s should probably be fine, as long as it's a good brand with good build quality. 800W might be a little better though.

As others have mentioned, pay attention to the rating of the 12v rail. Doesn't matter how much power the p/s can put out, if it can't put it where its needed.
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post #900 of 22311
A fully loaded 7950 pulls between 17 and 20 amps.

Not to mention spikes ripple etc.

The TX series is not the best.

And the most little get a AX 850.

I will not run more then 3 7950s on an AX 1200.

No amount of money or profits is worth risking the safety of my family.


Also running a psu near peak load can also lead to risks.


If im pulling 80 amps i want 100 amps.

Saving 50$ in the short term is just not worth it... And I will never understand why people risk it...

I bougght a used Antec true power Quattro 1200 watt psu for 120$.

Almost the same price as those risky small psu's the piece of mind and safety is always a top priority when running something fully loaded weeks at a time with long periods of being un monitored.
Edited by Hokies83 - 7/9/13 at 1:30pm
    
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CatLeap 2560x1440 + Acer hn274h bmiiid 120hz 3D Logitech G19 Corsair Ax1200 watts  Mountain Mods Ascension 
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