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XFX Core Edition 650W vs. 750W: which one should I buy? - Page 3

post #21 of 144
Thread Starter 
Wow, the v700 seems a real beast! The v650s isn't even that far outside of my budget, only 15€ more than the xfx 750w... what would I gain by going for the v650s instead?
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post #22 of 144
Quote:
Originally Posted by FabTheZen View Post

Wow, the v700 seems a real beast! The v650s isn't even that far outside of my budget, only 15€ more than the xfx 750w... what would I gain by going for the v650s instead?

Better ripple better voltage regulation and higher efficiency

Just note that the V650 and V700 have nothing in common other then the name

V450/V550/V650/V750 are semi modular units made by Enhance Electronics

The Cooler Master V700/V850/V1000 are Seasonic KM3 units thats been improved
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post #23 of 144
Thread Starter 
dangit xD
the v700 seems really appealing, but out of budget frown.gif
Anyway, does the XFX have good performance for its price? Could it lead to component stress on stock clock rates or are the differences visible only in particular strain conditions?
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post #24 of 144
Quote:
Originally Posted by FabTheZen View Post

dangit xD
the v700 seems really appealing, but out of budget frown.gif
Anyway, does the XFX have good performance for its price? Could it lead to component stress on stock clock rates or are the differences visible only in particular strain conditions?

The XFX Core Edition is decent and better then pretty much anything else in that price range

But its not a high end PSU nor is it outstanding its just above average

The Cooler Master V650S/V750S is where you get most for the money you pay right now
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post #25 of 144
Thread Starter 
So the V650S is on par with the V750S? Anyway sorry to seem ignorant, but I don't get in what my PC would gain with buying one of those PSU, I know the watt usage would be lower, but what else?
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post #26 of 144
Quote:
Originally Posted by FabTheZen View Post

So the V650S is on par with the V750S? Anyway sorry to seem ignorant, but I don't get in what my PC would gain with buying one of those PSU, I know the watt usage would be lower, but what else?

V650 and V750 is the same PSU its the V700 thats not the same

Better ripple means less noise in the power that comes to your hardware this means the parts will be stressed less

Better voltage regulation means the PSU is more stable

If you are overclocking you want as little ripple as you can and as good voltage regulation as you can get
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post #27 of 144
Quote:
Originally Posted by FabTheZen View Post

I'm shopping from http://www.e-key.it.
Quick link to the xfx 650:http://www.e-key.it/prod-alimentatore-pc-xfx-pro-series-650w-bronze-80plus-pro650w-27249.htm (it's going to be available later, I think. To check if an article is on their list even if out of stock, you can Google "(product name) e-key", since their search only includes articles on stock)
I guess the vast majority of PSU are peak rated then.How can I know if a PSU is peak or avg rated?

 

Look at the +12V capacity. If it's within about 92% of the advertised capacity, then that advertised capacity is likely a continuous capacity. If the +12V capacity is significantly lower, like 80% or less, then it's likely that the advertised capacity is the peak.

 

However, the quality of a PSU cannot be judged by this at all.

 

Quote:
Originally Posted by FabTheZen View Post

Thank you for the precious info. So if I decide to buy the xfx core 650w PSU to do a sli later, even just for fun, would I be sure I could sli 2 gtx 770 or something similar?

 

Their recommendation is for peak-rated PSUs. Multiply the recommendation by .72 to find out what the +12V capacity might be of a continuous-rated PSU. For example, 700-800 would be 504W to 576W. 504W is the same +12V capacity of some semi-decent 550W PSUs. 576W is the same +12V capacity of some semi-decent 650W units. See? :) 550-650W.

 

Quote:
Originally Posted by shilka View Post


No it does not all Core Edition are rebrand Seasonic S12II´s

You want two video cards for that you should go with the 650 watts

450 watts for one video card 650 watts for two

 

Not always. Some 2-way SLI setups can easily be powered by a good 450-550W PSU.

 

 

Quote:
Originally Posted by FabTheZen View Post

oh ok, but for example the 450w and 550w are excluded from haswell compatibility list. Well, you know what's weird? Those 2 are now out of stock, but as I said I think they'll come back soon, but their last seen price are 80,50€ for the 750W and 81,40€ (!!!) for the 650W. The prices could change when they come back, and I hope they lower down 650W's price rather than raising the 750W's XD

shilka, you mean I could sli 2xGTX770 with 650W? Anyway, if the 750W will still be cheaper when back, buying that one would give me some advantage against the 650W, like less noise, effort etc?

 

Don't worry about the Haswell compatibility too much:

 

Quote:
Originally Posted by qwan456 View Post

An independent PSU or a PSU with a DC-DC secondary will be "compatible" with Haswell's C7 power state.

Lower-end group-regulated PSU may have issues with it. Basically, this power state may keep the load of the +12v rail as low as 0.05A, and the whole scare is that the load on the minor 3.3/5v rails will affect the voltage of the +12v and cause it to go out of spec (the higher the load on the 5v, the higher the voltage goes on the +12v). So when you try to take your computer out of sleep, the OVP (over voltage protection) of the PSU may trip off and your computer will not power up.

The thing is, it's unlikely that the load on the minor rail during this low power state will be high enough to cause this problem anyways, so chances are, you don't have to worry even if it is not officially compatible (the testing methodology done by Intel and such is likely tested more in a worst-case and unlikely scenario). However, if you do run into this problem, then you should be able to disable this feature on the motherboard's BIOS.

 

Anyway, are you going to overclock the 770s? Are you going to overvolt them for extra overclocking? What about your CPU? What are your overclocking plans for it?

 

 

Also, unless you plan on doing some insane overclocking to your stuff, like using liquid nitrogen to cool your stuff, the XFX PSUs are more than good enough for you.

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post #28 of 144
Quote:
Anyway, are you going to overclock the 770s? Are you going to overvolt them for extra overclocking?

They're a bit of a pain to overvolt; i'd expect someone to be using ~1250-1350mhz @1.212v on most of the cards
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post #29 of 144
Quote:
Originally Posted by Cyro999 View Post


They're a bit of a pain to overvolt; i'd expect someone to be using ~1250-1350mhz @1.212v on most of the cards

 

What's the normal stock voltage?

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post #30 of 144
The windforce 770 allows you to use 1.2v or 1.212v. You might be able to manually change that (lower) by messing around in bios etc; as far as i'm aware though, you can't raise it. On some cards, you can
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