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Is this Psu decent enought for my system? - Page 3

post #21 of 34
Quote:
Originally Posted by Unoriginal Sin View Post
5870 are about 220W at full load.
Thuban @ 4Ghz ~170W
everything else you have listed <50W
^all that at full load

A 1100W unit should do, though if you're mining or running other distributed computing up you should do at least 1.2KW, I'd suggest a HCP1200 for a quad 5870 rig.
thanks for the advice, i looked at the PSU and its great but i want to buy a fully modular PSU.

what do you think of this baby right here
http://www.corsair.com/power-supply-...ts/ax1200.html
    
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post #22 of 34
Quote:
Originally Posted by Nnimrod View Post
Your PSU doesn't consume power, it only converts it, and loses some in the conversion. Efficiency is what you're talking about, not rated max wattage.

Ex. if system draw is 300W, a 1500W 80+ silver PSU will draw noticeably less power than a 350W not 80+ certified unit. However, power is relatively cheap, so don't spend $100 more for an 80+ platinum PSU with the idea that it will save you money; especially if system draw is relatively small.
I appreciate your enthusiasm but you don't seem to understand much.

A 1500W Silver rated unit will offer 85% minimum(in theory) efficiency from 20% to 100% load. Below 20% efficiency simply plunges, which means that below 300W draw(actual PSU output not the input you measure at the wall) you're going down hill very very fast.. in such circumstances, with a system that constantly draws less 300W your 350W 80+ PSU will draw less power than your 1.5KW Silver PSU, because conversion at very low loads in all modern PSUs is very poor.

In such circumstances(like the system of the OP) a 350W 80+ unit will be better suited than a 1.5KW Silver, it will be more efficient, which translates into lower operating costs, if will put out less heat due to that which subsequently translates into a less noisier rig(providing similar fans and controllers for both PSUs) and also in a longer PSU life providing similar caps user, for heat degrades capacitors.

Now, how exactly did you end up comparing a 350W 80+ PSU to a Silver 1.5KW!?.. I mean, which evolved vertebrate goes buying a PSU and says.. "this two are my options"!?
post #23 of 34
Quote:
Originally Posted by Fantasy View Post
thanks for the advice, i looked at the PSU and its great but i want to buy a fully modular PSU.

what do you think of this baby right here
http://www.corsair.com/power-supply-...ts/ax1200.html
The AX 1200 is an excellent unit(even though that impression is starting to change due to many fails and issues reported recently with these units), however for such a high end rig I'd go with a multirail PSU, it's just a lot safer.. if the HCP is a no go than you should look at an Enermax MaxRevo or Revo 85+ before the AX imo.
post #24 of 34
Quote:
Originally Posted by Unoriginal Sin View Post
I appreciate your enthusiasm but you don't seem to understand much.

A 1500W Silver rated unit will offer 85% minimum(in theory) efficiency from 20% to 100% load. Below 20% efficiency simply plunges, which means that below 300W draw(actual PSU output not the input you measure at the wall) you're going down hill very very fast.. in such circumstances, with a system that constantly draws less 300W your 350W 80+ PSU will draw less power than your 1.5KW Silver PSU, because conversion at very low loads in all modern PSUs is very poor.

In such circumstances(like the system of the OP) a 350W 80+ unit will be better suited than a 1.5KW Silver, it will be more efficient, which translates into lower operating costs, if will put out less heat due to that which subsequently translates into a less noisier rig(providing similar fans and controllers for both PSUs) and also in a longer PSU life providing similar caps user, for heat degrades capacitors.

Now, how exactly did you end up comparing a 350W 80+ PSU to a Silver 1.5KW!?.. I mean, which evolved vertebrate goes buying a PSU and says.. "this two are my options"!?
Yes I understand that efficiency drops when far outside the intended operation range, it was an EXAMPLE, therefore I used extremes in order to make my point a bit more obvious.

Two important details you missed:

1. 300W just happens to be exactly 20% of 1500W. BOOM ROASTED

2. You conveniently mis-quoted what I said. I said "a 350W not 80+ certified PSU" You quoted that as "a 350W 80+ PSU". check my un-edited post.

No offense intended, really
post #25 of 34
Agree with more power. If you're just gonna buy a new one in the future, just get a good one now anyways.
post #26 of 34
Quote:
Originally Posted by Nnimrod View Post
1. 300W just happens to be exactly 20% of 1500W. BOOM ROASTED

2. You conveniently mis-quoted what I said. I said "a 350W not 80+ certified PSU" You quoted that as "a 350W 80+ PSU". check my un-edited post.

No offense intended, really
I fail to see the relevance in your first point.. honestly, below 300W still means less than 300W as far as I know.. now, if you have a 300W rig like the op, 95% of the time you'll be well below that, except some high stress gaming scenes and the occasional benchmark to test stability or new drivers or w/e, you'll see ~150W values when browsing, downloading, mutitasking, streaming etc

In the case of your second point, indeed I missed the 'not', however, comparing a 15$ PSU to a 250$+ one is completely beyond the point of this thread.. discussing concepts is one thing but your comparison is beyond obvious.
post #27 of 34
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post #28 of 34
Quote:
Originally Posted by Unoriginal Sin View Post
I fail to see the relevance in your first point.. honestly, below 300W still means less than 300W as far as I know.. now, if you have a 300W rig like the op, 95% of the time you'll be well below that, except some high stress gaming scenes and the occasional benchmark to test stability or new drivers or w/e, you'll see ~150W values when browsing, downloading, mutitasking, streaming etc

In the case of your second point, indeed I missed the 'not', however, comparing a 15$ PSU to a 250$+ one is completely beyond the point of this thread.. discussing concepts is one thing but your comparison is beyond obvious.
OK, since you still feel like arguing and nitpicking, I'll try to make this real simple

PSUs only use the wattage you draw from them. As long as you are inside the intended operating range, efficiency, not max rated wattage, determines power consumption.
post #29 of 34
Quote:
Originally Posted by Nnimrod View Post
OK, since you still feel like arguing and nitpicking, I'll try to make this real simple

PSUs only use the wattage you draw from them. As long as you are inside the intended operating range, efficiency, not max rated wattage, determines power consumption.
Impressive.. I wouldn't have thought. Also, can bold that a little more?
post #30 of 34
Thread Starter 
Quote:
Originally Posted by Unoriginal Sin View Post
I fail to see the relevance in your first point.. honestly, below 300W still means less than 300W as far as I know.. now, if you have a 300W rig like the op, 95% of the time you'll be well below that, except some high stress gaming scenes and the occasional benchmark to test stability or new drivers or w/e, you'll see ~150W values when browsing, downloading, mutitasking, streaming etc

In the case of your second point, indeed I missed the 'not', however, comparing a 15$ PSU to a 250$+ one is completely beyond the point of this thread.. discussing concepts is one thing but your comparison is beyond obvious.
I don't see how you think this rig runs on 300 watts.. The Hd 5830 Requires like a minimum of 500watts i think.
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