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Is Corsair AX750 enough to power i7-3770k, MSI HD7950 Twin Frozr Crossfire and more?

post #1 of 12
Thread Starter 
It seems it is going to be enough to power that setup. I will be overclocking 3770k to 4.5GHz and both cards will be overclocked to around 1200/1500. I do not want the PSU to be huffing and puffing.

I compared specs between ax750 and ax850.

Max output is the the same at 125W
+12v 62a at 744W max and 70A at 850W max


Everything else is the same. What do you think guys?
post #2 of 12
yes
post #3 of 12
I would say the AX 750 will have enough.. But why not just stick with the 850 in your sig?
    
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post #4 of 12
Just leave this tid bit here....
Quote:
Originally Posted by bratt01 View Post

Im running a 3930k @ 4.5 and two xfx 7970s @ 1200/1600. 2 x ssds, 2 x hdds, duel watercooling loops. Mine pulls just over 1000 w from the wall under aida64 stress test.
I had an 850w silentpro m2 before and had quite a few lockups and bsods.
Have since upgraded to a ax1200i and the system has been perfectly stable since.
Having a "just enough" psu, and taking into account regular inefficiency, will cause a rise in temps causing a further reduction in efficiency, bringing the true serviceable watts down even further.
My experience tells me, whenever going for a new psu, get the biggest one you can afford to allow for another upgrade cycle or two.
Spending an extra 100 or so now saves you from having to buy a complete new psu when you upgrade next time costing you much more than $100.
Always remember increased load for an extended time creates heat which in turn reduces efficiency further. Running a 10 minute stress test gives you an estimated power draw, but does not give you an estimated reduction in efficiency due to heat.(cos it takes longer to develop) And this is even with badass cooling.

Do a weekend of full on gaming/add in some folding occasionally, and throw in a few hot summer days and a pc suddenly needs more from the psu than it can provide.

Sent from my GT-I9300T using Tapatalk 2

Quote:
Originally Posted by tsm106 View Post

^^Concur. I've blown my share of psus to know better now. All the you can do it on minimal watts lol. Who ends up paying for the losses, ie dead psu and the new ones? You do, the user, and there be the rub.
 
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post #5 of 12
Thread Starter 
Quote:
Originally Posted by CudaBoy71 View Post

I would say the AX 750 will have enough.. But why not just stick with the 850 in your sig?

The AX850 is sitting in my rig. I need a PSU for my wife's gaming computer. I have an AX750 at home but I am having doubts.
post #6 of 12
Get an 850W if you can for a bit of leeway, like the post above shows... better safe than sorry
See if you could sell it/ trade it in and upgrade to the 850
post #7 of 12
Thread Starter 
Quote:
Originally Posted by A14M3D View Post

Get an 850W if you can for a bit of leeway, like the post above shows... better safe than sorry
See if you could sell it/ trade it in and upgrade to the 850

I think I am going to upgrade since there is a good deal at Newegg at the moment on AX850. I bought mine over two years ago as open box PSU (ordered TX though) and it is the best PSU I have ever had in terms of performance, noise and reliability.

EDIT: Actually I am going swap out AX850 with AX750. I checked my power consumption and I had to try really hard to break 450watts playing games with my sig rig.
Edited by Iching - 3/24/13 at 12:18am
post #8 of 12
There are several websites that have power calculators. This is the most complete imho - http://www.extreme.outervision.com/psucalculatorlite.jsp
Newegg also has one, but feel it intentionally over calculates. thinking.gif
    
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post #9 of 12
Are you looking at buying a new 750 or 850 or do you have some laying around?
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post #10 of 12
its more than enough with all overclocking
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