Something Linus Said

[XPhoebusApolloX]

Yeah so... I dont remember where it was, but i remember Linus said something here recently about how you could run a Titan off a 450 watt power supply or something like that. Anyone who remembers him saying this, could you please explain this devil magic? Kay thanks

[Guest]

Yeah so... I dont remember where it was, but i remember Linus said something here recently about how you could run a Titan off a 450 watt power supply or something like that. Anyone who remembers him saying this, could you please explain this devil magic? Kay thanks

They were running a titan and I think a 4670K or 4770K off a 550w fanless from Seasonic I believe. 

[XzzDSA]

Yeah so... I dont remember where it was, but i remember Linus said something here recently about how you could run a Titan off a 450 watt power supply or something like that. Anyone who remembers him saying this, could you please explain this devil magic? Kay thanks

They were talking about the steam machine prototypes, which will ship with titans and 780's on a 450Watt PSU

[mr moose]

he also mentions a steam box running with a 450w PSU in a recent WAN show.

[XPhoebusApolloX]

They were talking about the steam machine prototypes, which will ship with titans and 780's on a 450Watt PSU

 

I guess if you just have the most efficient psu in the world? lol! But still, that seems crazy to me.

[XzzDSA]

I guess if you just have the most efficient psu in the world? lol! But still, that seems crazy to me.

Tbh. You don't really NEED much more to run most systems... Although I would proberly recommend 550watt psu's just to get some headroom.

 

450 is squeezing it, but when you count it up.. 250watt tdp for GPU, around 85watt tdp for CPU.. and then just misc which may add up to around 370-80, then a bit of loss in efficiency, so you might be pulling around 410watt of the wall

[XzzDSA]

But that said, if you are oc'ing.. Watercooling and run alot of fans and other components, you need a beafier PSU. And if you were to go SLI or Crossfire.. Well.. It adds up

[rentaspoon]

Does anyone else run linux? I find its a little easier on cpu and gpu (not talking about ubuntu) so maybe they aren't expecting it to top out as much?

[Fetzie]

Usual tom'sHARDWARE pinch of salt applies (it was the first result in the list after searching for "GTX Titan power draw" so shoot me):

 

Total system load with a 3970X@4.5GHz and an assortment of graphics cards while running 3DMark:

 

[Puppet]

It's not really about overall wattage of a power supply, it's what load the 12v rails can handle.

 

Those Silverstone SFX 450W PSUs can handle a lot on the 12v rails, it should be able to run a Titan, but you wouldn't have any room for overclocking and degradation could become a problem in the future.

 

Because a lot of attention is going to be on the Steambox, I'm sure a lot of manufacturers will be concentrating on solutions for this, but yeah I would say a Titan on a decent 450W is possible... not comfortable.

[SirReallySam]

They were talking about the steam machine prototypes, which will ship with titans and 780's on a 450Watt PSU

indeed

[KaareKanin]

Yeah so... I dont remember where it was, but i remember Linus said something here recently about how you could run a Titan off a 450 watt power supply or something like that. Anyone who remembers him saying this, could you please explain this devil magic? Kay thanks

 

They talked about it here:

http://youtu.be/c8WrGJ4GLm4?t=1h3m30s

 

So the TDP of the Titan is quoted at 250W, the TDP for a 4770 (non-k) is 84W, so a total of 334W for the processing units. And the non-k CPUs won't really overclock, so on the CPU side of things that number won't really get any bigger.

[Stonep11]

 

Yeah so... I dont remember where it was, but i remember Linus said something here recently about how you could run a Titan off a 450 watt power supply or something like that. Anyone who remembers him saying this, could you please explain this devil magic? Kay thanks

 

The ibuypower Revolt, the Falcon Northwest Tiki, and I think the Digital Storm Bolt all use a 450W or 500W PSU and you can choose to have a Titan in the build.

[Puppet]

They talked about it here:

http://youtu.be/c8WrGJ4GLm4?t=1h3m30s

 

So the TDP of the Titan is quoted at 250W, the TDP for a 4770 (non-k) is 84W, so a total of 334W for the processing units. And the non-k CPUs won't really overclock, so on the CPU side of things that number won't really get any bigger.

 

This link really clears everything up, he says "borderline" which is true.

 

That being said Steambox will probably get a bespoke PSU that will divide the power up accordingly and considering that it will probably have some limitations on overclocking ability and additional hardware, a 450W is definitely a lot more achievable compared to a custom built PC.

[Humbug]

Agreed with above post. Valve's machines should not be taken as an indication for the rest of the market who builds custom PCs. They get to test loads of PSUs and pick the most efficient one for the job since they know exactly how much amperage they want and where. They probably engineered it very precisely... Also they are running only 1 x HDD and no fancy LEDs etc...

[MrSuperb]

It's not really about overall wattage of a power supply, it's what load the 12v rails can handle.

 

Those Silverstone SFX 450W PSUs can handle a lot on the 12v rails, it should be able to run a Titan, but you wouldn't have any room for overclocking and degradation could become a problem in the future.

 

With a modern haswell cpu even a little ocing should be possible ...

A titan + 4770k probably draw around 350 Watt on the DC side ..

-------------------------------

 

That being said, rumor has it, that Silverstone is working on something between 550-600Watt in the SFX form factor

This should be sufficient for an oced 4770k and an oced GTX Titan (no extreme overclocks though) and leave some decent headroom

[Cyrus]

This PC that i run (Specs in SIG) consumes 412 WATT.

[EChondo]

Agreed with above post. Valve's machines should not be taken as an indication for the rest of the market who builds custom PCs. They get to test loads of PSUs and pick the most efficient one for the job since they know exactly how much amperage they want and where. They probably engineered it very precisely... Also they are running only 1 x HDD and no fancy LEDs etc...

Well as @MG2R has said before, there's a lot more that goes into power supply calcuation than just TDP and total wattage.

 

PSU's have effeciency ratings as well as peak effeciencies. The higher grade(Bronze, Silver, Gold, etc.) the more effecient it can be, but also it depends on the load of the PSU. A PSU's highest effeciency is when it is at 50% load, so for the Steam Machine to be 100% power effecient it would need a 800w PSU because of this. Having a 450w PSU for a system that pulls 400w max or so, isn't as effecient as it could be. Sure the difference between 50% and 80% load is around -3% difference in effeciency, but in the overall cost of the system and also having to pay for electricity, it can really add up in the end.

 

Some states pay $0.04 per kilo-watt, while others pay $0.07 or even $0.15, it varies on city to city really and how the power is created and provided to the city and/or region. They might be doing a 450w PSU to save costs because it is more cost effecient at first.

[MrSuperb]

This PC that i run (Specs in SIG) consumes 412 WATT.

I'd guess that measurement happened at the wall (I.e. on the ac-side). Considering an efficiency of let's say 90% that pretty much confirms what