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XFX Core Edition 650W vs. 750W: which one should I buy? - Page 8

post #71 of 144
Quote:
Originally Posted by FabTheZen View Post

At the cost of being repetitive, thank you both, but I haven't understood yet why you're ignoring all the rails that are not +12V, they still contribute to the whole power drain, isn't it? There's something I'm not getting right, would you please explain?

12v rail is your main rail it powers more then 90% of your PC

5v and 3,3v rails are minor
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post #72 of 144
Thread Starter 
There is something strange: if I sum up all the powers, calculated from the currents, of the XFX 650W (specs: http://products.xfxforce.com/en-gb/Power_Supplies/Pro_Series_650W_PSU/P1-650S-UKB9) it comes up that it can output 843,5W... am I going on a totally wrong binary here?

I'll try to sleep on it, meanwhile could you help me clarify the PSU rail thing? what do the other rails power exactly?
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post #73 of 144
Quote:
Originally Posted by FabTheZen View Post

At the cost of being repetitive, thank you both, but I haven't understood yet why you're ignoring all the rails that are not +12V, they still contribute to the whole power drain, isn't it? There's something I'm not getting right, would you please explain?

 

Because the majority of a modern system runs on 12V power. Here's a breakdown:

 

http://www.overclock.net/t/722251/on-psu-voltages

 

Quote:
Originally Posted by FabTheZen View Post

There is something strange: if I sum up all the powers, calculated from the currents, of the XFX 650W (specs: http://products.xfxforce.com/en-gb/Power_Supplies/Pro_Series_650W_PSU/P1-650S-UKB9) it comes up that it can output 843,5W... am I going on a totally wrong binary here?

I'll try to sleep on it, meanwhile could you help me clarify the PSU rail thing? what do the other rails power exactly?

 

No, it can't be added up that way. I don't remember how to explain it, you'd have to ask Phaedrus2129. All I know is, it can't be added up that way. 843.5W would even be above its peak capacity.

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post #74 of 144
Thread Starter 
Thanks for Phaedrus's article, he's a great source of information!! I've been rearing more of his "works" around here, and I have to say he really helped me, though I can't find any modern psu advises on modern PCs, since he's now retired...
I've read your posts again, and I just realized what bugs me is his: we all agree that on hard benchmarking 650W could not be sufficient, or just too near the peak, for the PSU to hold for more that, say, 5 mins. What happens if a day I buy the 2nd video card and say "hey let's benchmark!"?

I was also thinking about totally avoid the sli thing, maybe I could sell the old card and buy a new better one. Do you know if there's still a market for a zotac gtx 260 core 216?
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post #75 of 144
Unigine Heaven 4.0 is a benchmark. It uses ~180-185w or so at 1300mhz. It's actually very close to game power usage.

Furmark is not a benchmark, it's a torture test. It uses 255w at under 1300mhz (maxes out the power til card throttles)

There's little market for a 216 core gtx260, i've got one
Quote:
What happens if a day I buy the 2nd video card and say "hey let's benchmark!"?

Two 770's at max OC in Heaven 4.0? That would use like ~370w avg, CPU isn't really under any major load, your entire system draw won't even pass lower half of 400w range

There's little problem gaming or benchmarking, the biggest power loads you would see are either if you're PSU stressing (maxing CPU 100% and GPU's 100% at the same time) which - if you choose the highest power draw situations, like avx2 linx and furmark, sure, you can probably get too much power - but realistically, x264 and heaven 4.0 for example.. Not so much. I'd get a nice PSU if i was definitely going to SLI, but if i wasn't sure then i would just sit on a good unit like a golden green 450 and flip it when i was sure what i wanted

Ran heaven 4.0 now @1293/7600 1.2v on 770 - reporting ~80% of tdp, around the same as many games (~184w) which is pretty accurate sensor (gpu boost tdp sensor) but stock is less, meanwhile cpu can reasonably be assumed to be like 120w if you're maxing it encoding with x264 - so that's ~300w - 485w if you add another gpu, plus other system stuff (while you're loading everything which will use more power than gaming etc)

That's why i said like i didn't know where they get ~612w minimum from, it seems like a high number, considering this is power draw with GPU's at max OC
Edited by Cyro999 - 1/15/14 at 12:04pm
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post #76 of 144
Thread Starter 
Alright, I guess I'm going with the 650w, but just to know, isn't a good deal a 750w PSU for only 12€ more?

OMG, you have the 260 core 216... PM time biggrin.gif
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post #77 of 144
If you want to sli and never worry or calculate anything to do with psu, 750w xfx is ok choice. Again though sounds like you probably "might" maybe sli at some point tongue.gif which makes it an awkwarder choice
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post #78 of 144
imma gonna come out of lurking to throw my 2cents.gif in.

if you are not already saving money for the second card to SLI, there is no to very little chance you will and it looks like you don't have the first one yet.

no offense, you're complicating things. be honest with yourself; if it will take a year before you can afford it, there will be other better performing cards out and it would be cheaper to sell the 770 (if you get that) and buy a better card then to buy another 770.

go with the XFX 650. wink.gif
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post #79 of 144
Thread Starter 
looniam, I was thinking the same thing while undoing the Christmas three earlier xD
I don't even think I'm going to do SLI, also because that would happen like in 3 years from now, not earlier! I just wanted to be as future-proof as it's wise to do. The thing is, I'm not wise, this is my first build, and it's not even going to be a full one, just a "zombie" upgrade, a good gaming machine in a small 2007 aluminum chassis and a 2009 video card....

So, I'll ask once more, as if I wasn't enough redundant until now: is a 750W PSU going to be of ANY help/advantage with my complete build?
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post #80 of 144
Quote:
Originally Posted by FabTheZen View Post

looniam, I was thinking the same thing while undoing the Christmas three earlier xD
I don't even think I'm going to do SLI, also because that would happen like in 3 years from now, not earlier! I just wanted to be as future-proof as it's wise to do. The thing is, I'm not wise, this is my first build, and it's not even going to be a full one, just a "zombie" upgrade, a good gaming machine in a small 2007 aluminum chassis and a 2009 video card....

So, I'll ask once more, as if I wasn't enough redundant until now: is a 750W PSU going to be of ANY help/advantage with my complete build?

no.

a 500 watt will manage with a 650 to allow more components/overclocking.

personally i have a 620 watt PSU and i feel guilty because my rig will mange with 100 watts less easily.
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