Which PSU do you recommend?

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MagnusMaximus

Honorable
Feb 5, 2014
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10,510
Hello recently I build a new computer, but it's not working properly. It drives fine browsing on the internet and in less demanding games such as League of Legends. It is able to drive MW3 for example on full graphics for a while, but suddenly it crashes out of nowhere. In newer games such as Batman Arkham City it almost crashes immediately. Since the only thing that's not completely new is the PSU, I'm guessing that is where I've got a problem. It is a several years old 750W PSU by the way.

Here are my components:

The Old 750W PSU
I5 4670k
Gigabyte Gerforce GTX 770 OC 2GB
Asus Z87-Pro (V-edition)
2x Corsair 4gb DDR3 1866mHz
Kingston SSD 120GB
Asus Xonar DX
Seagate Barracuda 1TB 7200RPM

Do you also think the problem is the PSU?
If yes - Which one do you recommend? I would like one which is Haswell Compatible.
If no - What do you think the problem is?



 
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ko888

ko888

Titan
Feb 18, 2009
16,708
41
84,990


But it isn't on XFX's Haswell-Compatible PSU List: http://xfxforce.com/pt-br/Features/haswell-compatibility-with-xfx-power-supplies.aspx

The XFX Pro Series Core Edition 650W model is Haswell Compatible.
 
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ko888

ko888

Titan
Feb 18, 2009
16,708
41
84,990


What does Haswell compatibility have to do with powering multiple graphics cards?

Obviously you have no idea what Haswell compatibility involves.
 
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HiTechObsessed

HiTechObsessed

Splendid
Dec 3, 2013
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24,960
My point was, 'Haswell Compatibility' is simply a tagline used for marketing, but doesn't really mean anything. A PSU doesn't have to say 'Haswell Ready' to run a Haswell based system.

I added the point about running multiple cards to show you that these taglines for PSUs mean nothing, it's just to lure people into buying them.
 
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ko888

ko888

Titan
Feb 18, 2009
16,708
41
84,990


There's a reason why XFX doesn't claim that the 550W model is Haswell compatible. Even JonnyGuru's crossload test during the review of that PSU shows that there is a potential problem.
 
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ko888

ko888

Titan
Feb 18, 2009
16,708
41
84,990


Haswell processors can enter a sleep state called C6/C7 that can drop the processor's current draw on the +12V rail to as low as 0.05 Amps. Certain legacy PSUs may become unstable at the new minimum +12V current draw of 0.05 Amps and trigger the PSU’s under/overvoltage protection circuit causing the PSU to shut down.

JonnyGuru tetsted the XFX Core Edition 550W at 2 Amps on the +12V rail during their crossload test and the +12V rail reached +12.57 Volts. The ATX12V Power Supply Design Specs says that +12.60 Volts is the maximum voltage allowed on the +12V rail. No doubt XFX encountered this during their Haswell Compatibility testing of their PSUs.

The Seasonic S12II Series 520W, on which the XFX Core Edition 550W is based upon, actually goes out of spec (i.e. +12.65 Volts) during the same crossload test. Seasonic also doesn't claim Haswell Compatibility for any of their S12II Series models.

Haswell Compatibility is not just a marketing gimick, as you claim, especially to those that own an Intel Haswell processor and want to be able to use the C6/C7 low power states that they paid for.

Haswell Compatibility is meaningless to those that use AMD processors or pre-Haswell Intel processors.

All later Intel processor generations will have these low power states so if the PSU problem can be avoided altogether then that is what should be done.
 
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