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Single Rail 1500w or higher PSU's. Cant find any? Does anyone know of one? - Page 6

post #51 of 70
Quote:
Originally Posted by Stu-Crossfire View Post

Indeed it would. smile.gif
A 4th is in my future, just awaiting a new Chipset worth changing the MIVE-Z and 3770K for.

However, I really dont like running PSU's flat out, its asking for trouble IMO and this rig has cost me the wrong end of £6K and I simply down want to wreck any of it for the sake of a couple of hundred quid on a part I will need in the future anyway.

Got myself a new power monitor today that gives running costs etc too, its pretty funky.

I am going to plug them both into a kettle to check they are accurate then take a risk and run Kombuster flat out with all the cards and CPU up at 1.3v and see what she draws, as I once saw over 1.3K just before the OCP kicked my ass. LOL

Watch this space. smile.gif
I've already explained to you above, what you're measuring is AC power, your PSU is rated for DC output, which means it will draw (considerably) more than its rating to output its full rated power.
As stated previously, you would have to see AC draws in excess of 1.5KW for it to be considered a meaningful overload.... as it stands right now, you're far from running your PSU flat out. wink.gif
Edited by Original Sin - 2/12/13 at 12:32pm
post #52 of 70
Quote:
Originally Posted by Stu-Crossfire View Post

Indeed it would. smile.gif
A 4th is in my future, just awaiting a new Chipset worth changing the MIVE-Z and 3770K for.

However, I really dont like running PSU's flat out, its asking for trouble IMO and this rig has cost me the wrong end of £6K and I simply down want to wreck any of it for the sake of a couple of hundred quid on a part I will need in the future anyway.

Got myself a new power monitor today that gives running costs etc too, its pretty funky.

I am going to plug them both into a kettle to check they are accurate then take a risk and run Kombuster flat out with all the cards and CPU up at 1.3v and see what she draws, as I once saw over 1.3K just before the OCP kicked my ass. LOL

Watch this space. smile.gif
Quote:
Originally Posted by Original Sin View Post

I've already explained to you above, what you're measuring is AC power, your PSU is rated for DC output, which means it will draw (considerably) more than its rating to output its full rated power.
As stated previously, you would have to see AC draws in excess of 1.5KW for it to be considered a meaningful overload.... as it stands right now, you're far from running your PSU flat out. wink.gif

he is correct Stu for your psu to be at its maximum 1250. at 84% efficiency you will see 1450 watts on your power meter and there should typically be an ovehead on that as well

as shown on kitguru the x1250 can deliver an extra 100 watts before it hits ocp,that is if its connect correctly of course
Edited by obsidian86 - 2/12/13 at 1:17pm
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post #53 of 70
Thread Starter 
Like I have said on this topic already guys, I personally don't want a PSU running any more than 80% capacity and I will need a bigger one at some point anyway, so why push this one so hard and risk damaging it, or equipment connected to it?


Best Regards,
Stu.

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post #54 of 70
Quote:
Originally Posted by Stu-Crossfire View Post

Like I have said on this topic already guys, I personally don't want a PSU running any more than 80% capacity and I will need a bigger one at some point anyway, so why push this one so hard and risk damaging it, or equipment connected to it?


Lepa G1600 then, powerful unit, great customer service with Ecomaster. Can't say anything negative about it.

(Maybe 1 thing: it doesn't have a power switch on it)
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post #55 of 70
Quote:
Originally Posted by Stu-Crossfire View Post

Indeed it would. smile.gif
A 4th is in my future, just awaiting a new Chipset worth changing the MIVE-Z and 3770K for.

However, I really dont like running PSU's flat out, its asking for trouble IMO and this rig has cost me the wrong end of £6K and I simply down want to wreck any of it for the sake of a couple of hundred quid on a part I will need in the future anyway.

Got myself a new power monitor today that gives running costs etc too, its pretty funky.

I am going to plug them both into a kettle to check they are accurate then take a risk and run Kombuster flat out with all the cards and CPU up at 1.3v and see what she draws, as I once saw over 1.3K just before the OCP kicked my ass. LOL

Watch this space. smile.gif



he is correct Stu for your psu to be at its maximum 1250. at 84% efficiency you will see 1450 watts on your power meter and there should typically be an ovehead on that as well

That would be true if it were a true single rail but it's not it is a 4 rail avdertised as a single that is why it tripped out one rail was overloaded ie the cpu is proably using using 50% of that 1 rail capacity while the gpus are maxing out the rest.

I will keep an eye on this I totally agree about not wanting to run a psu on limit I always wonder why people recommend a 700w over a 850w when 700w will BARELY do the job.
The 700w will give you more ripple limiting you oc potential and a dramasically shorten life span of the psu.
I have been told many times I only need an 850w I have seen people use the same HX850 without problems But I tripped mine out because the 20% oc on my gpus + 25% oc on the cpu and the 10 case fans(an extra 40-50w) were not taken account in the absolute minium psu requirements.

I have a friend like this I have talked to him many times about this and his 650w psu with a 100w oc potential but in the end he couldn't work out how my 2 gtx580 sli are within 200pts of his 2 680 sli in 3dmark11 but he says it is fine because the psu isn't tripping out. go Figure
Edited by feznz - 2/12/13 at 11:44pm
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post #56 of 70
Thread Starter 
Quote:
Originally Posted by obsidian86 View Post


he is correct Stu for your psu to be at its maximum 1250. at 84% efficiency you will see 1450 watts on your power meter and there should typically be an ovehead on that as well

as shown on kitguru the x1250 can deliver an extra 100 watts before it hits ocp,that is if its connect correctly of course

I think people are ignoring the fact that even drawing 1000w from a 1250w PSU can shorten its life as it may have 200w spare on 1 rail, but be within 10w of maximum draw on another 5 if its a multi rail PSU. Thats why I chose (or thought I chose) a single rail.

I just dont like running PSU's so hard, its not healthy for the PSU and it risks my rig unecessarily. It also affects stability as the power is not as clean near max draw and ripple etc can affect OC stability quite dramatically and benching is what I enjoy so my PSU is important to me.
Quote:
for your psu to be at its maximum 1250. at 84% efficiency you will see 1450 watts on your power meter

Like this you mean?


See here for more info plus testing to show my new power meter is as accurate as my old one. smile.gif
http://www.overclock.net/t/1360051/the-power-cost-of-high-performance-gaming-rigs/0_40#post_19275608
Edited by Stu-Crossfire - 2/13/13 at 2:45am
post #57 of 70
Run multiple PSUs then?
 
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post #58 of 70
Thread Starter 
Quote:
Originally Posted by deafboy View Post

Run multiple PSUs then?

My Enermax max Revo just landed... if it doesnt do the job then multi PSU will be my next course of action but looking at the rail config it should be fine.

30A available for each card seperately on their own dedicated rails 25a available for CPU/Mobo on their own dedicated rails rail and 30A available for peripherals on their own rails and a peak power rating of 1650w. It "Should" be a winner.
post #59 of 70
Quote:
Originally Posted by Stu-Crossfire View Post

I think people are ignoring the fact that even drawing 1000w from a 1250w PSU can shorten its life as it may have 200w spare on 1 rail, but be within 10w of maximum draw on another 5 if its a multi rail PSU. Thats why I chose (or thought I chose) a single rail.

I think you misunderstand how the different rails work. Running one rail at 100% and one at 0% is exactly the same to a PSU as running both at 50%. Rails are a completely fabricated construct. There is only one 12v supply inside the unit. This one supply feeds power into the output traces on the PCB. These output traces then have a device for measuring current, one on each rail. These rails can then be monitored for separate currents.

The only difference between this and a single rail design is that a single rail design monitors currents of the entire unit at one point, whereas a multi rail design monitors the currents of certain sections of the PSU separately. The actual power components are exactly the same, so the only power figure relevant to PSU life is the total DC power draw.

On top of that, any quality PSU is always quite underrated compared to what it could safely put out. This is to keep the output clean and the components safe. If it is rated for a continuous output under certain conditions, it means it can maintain that power level for it's entire life. If you are really concerned, I would not tell you not to buy a new PSU, but I would suggest that the way you are running it now is completely safe and I would not worry about it in the slightest.
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post #60 of 70
Thread Starter 
Quote:
Originally Posted by DirektEffekt View Post

I think you misunderstand how the different rails work. Running one rail at 100% and one at 0% is exactly the same to a PSU as running both at 50%. Rails are a completely fabricated construct. There is only one 12v supply inside the unit. This one supply feeds power into the output traces on the PCB. These output traces then have a device for measuring current, one on each rail. These rails can then be monitored for separate currents.

Im not sure I agree. The rails are individually limited to, lets say 25A are they not?
So if it doesnt matter as you say, what is the 25A limit actually for? Purely to protect components? If so, why dont they just make 4x High power 40A rails for GPU's?

There are also temperature issues to consider. The fans on this thing start screaming at 1100w+ and that rated output is for sub 50C temperatures.


Quote:
If you are really concerned, I would not tell you not to buy a new PSU, but I would suggest that the way you are running it now is completely safe and I would not worry about it in the slightest.

I still think in excess of 1450w is a bit much for a 1250w 89% efficient rated power supply as I am far exceeding 95% of its rated capacity and will just feel happier with one rated higher and also one that wont have its fans screaming when benching. smile.gif

I calculate the 1462w draw at 89% efficiency as 1301w from the PSU.
I really am struggling to see why folk think that is an acceptable draw from a 1250w PSU? redface.gif
Edited by Stu-Crossfire - 2/13/13 at 4:30am
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