Would two GTX 760's and an i7 work on the Bitfenix Fury 750w?

[ThomasAgre]

Just because I've seen threads saying you need multiple combined rails, while the fury uses a single rail. Would it work?

[AlwaysFSX]

It works fine, and it's preferable to have a single rail psu instead of a mutli-rail psu just for stability.

[Guest]

It would work great. Have fun!

[AMICLG]

It'll work but it's always better to get one more powerful GPU than two less powerful cards.

[quan289]

It works fine, and it's preferable to have a single rail psu instead of a mutli-rail psu just for stability.

 

That's actually false. Whether it is SR or MR, the voltages of the +12v aren't any more stable at all. MR was implemented for safety purpose in an event where a component is drawing to much power from a single set of wires and damage itself, while a single rail may be ideal for the benchers who are heavily overclocking under liquid or LN2 (since there may be a high +12v load, you run the rest of tripping off the OCP).

 

Interestingly enough, the stability of this unit is faulted by the design of the unit, where it is based on the group-regulated FSP Aurum.

 

Nonetheless, the BF Fury 750w would be fine for his system like you and the others have said.

[AlwaysFSX]

That's actually false. Whether it is SR or MR, the voltages of the +12v aren't any more stable at all. MR was implemented for safety purpose in an event where a component is drawing to much power from a single set of wires and damage itself, while a single rail may be ideal for the benchers who are heavily overclocking under liquid or LN2 (since there may be a high +12v load, you run the rest of tripping off the OCP).

 

Interestingly enough, the stability of this unit is faulted by the design of the unit, where it is based on the group-regulated FSP Aurum.

 

Nonetheless, the BF Fury 750w would be fine for his system like you and the others have said.

If you put too much strain on one of the rails in a MR power supply because of graphics cards for example you can short the entire system and kill your hardware.

[quan289]

If you put too much strain on one of the rails in a MR power supply because of graphics cards for example you can short the entire system and kill your hardware.

 

What "strain"? The rails are virtual limits. Just like a single rail unit, MR units typically have a SINGLE +12v source. MR is kind of like the breaker system inside your house. In other words, you have a multiple of rails rated for 30A, and the total combine A of the +12v rail is 70A. If you were to put 28A on one of the rails, the strain of the actual +12v capacity is still 28A out of 70A.

 

It's interesting how you mentioned a short. Because when a component fail and shorted out, the SCP of the PSU may not detect it. So that shorted component will continuously to draw more and more power from that +12v rail unit another protection is set off (OCP or OPP) or something burns out and catches on fire. MR are design to catch this sooner because of the low virtual limit, while a SR doesn't have this virtual limit and you are theoretically capable of pulling entirety of the +12v rail off of that single cable. This can also mean that the larger the unit, the greater the risk.

 

Here's a thread: http://www.overclock.net/t/944707/why-single-rail-is-not-better-than-multi-rail

This video shows someone attempted to simulate a short on a SR: http://www.pcgameshardware.de/Panorama-Thema-233992/Videos/PCGH-in-Gefahr-Rauchexplosion-bei-Netzteilkurzschluss-1057938/

Here's a discussion at JG: http://www.jonnyguru.com/forums/showthread.php?t=3990

There's also a discussion on a PSU review site docking points for SR units. http://www.jonnyguru.com/forums/showthread.php?t=11557

Of course, while there are people in disagreement in doing this, no one mentioned that SR are "more stable", but they seem to agree on the fact that it is indeed inherently safer.

There was someone who had a shorted fan controller on this site, and it keep causing the cables to burned out.

 

"So why do they do they split up +12V rails??

Safety. It's done for the same reason that there's more than one circuit breaker in your house's distribution panel. The goal is to limit the current through each wire to what that wire can carry without getting dangerously hot.

Short circuit protection only works if there's minimal to no resistance in the short (like two wires touching or a hot lead touching a ground like the chassis wall, etc.) If the short occurs on a PCB, in a motor, etc. the resistance in this circuit will typically NOT trip short circuit protection. What does happen is the short essentially creates a load. Without an OCP the load just increases and increases until the wire heats up and the insulation melts off and there's a molten pile of flaming plastic at the bottom of the chassis. This is why rails are split up and "capped off" in most power supplies; there is a safety concern."

 

"... typically there is only one +12V source and there is typically no additional filtering stage added when the rails are split off that makes the rails any more stable or cleaner than if they weren't split at all."

 

BTW, did you know that there are some companies that advertised an unit as SR because they know the mass like SR units, even though in actuality the unit is MR? Seasonic did this on a few of their units.

[reutrel]

cooler master psu calc?