How much extra power do i need?

[MasterRaceMcqueen]

So... i'm building a 7700k 5.0 ghz  gtx 1080 ti all custom water cooler system... and some one told me that a psu will be more efficient with the 'w' correspondent be the  double of my total system consumtion...
So... let's say... 400w rigth? 
So i will need a 800w psu? for more efficient?
I was looking those benchmarks and the seasonic 650w looks good and it's not so expensive compare to the others... but it's only a 650w psy 

https://img.purch.com/w/643/aHR0cDovL21lZGlhLmJlc3RvZm1pY3JvLmNvbS9RL1QvNjU0MTQ5L29yaWdpbmFsL3JlbGF0aXZlX3BlcmZvcm1hbmNlLnBuZw==

any one can help me with this?

This is a true information?

[paps511]

IIRC the optimal efficiency is about 80% of capacity. Not 50%.

 

For a 7700k and 1080Ti I would suggest 650-750 watts

[FloRolf]

the 'w' correspondent?

Maybe you shouldnt build a watercooled high end pc if you don't know what the w is?

 

But yes, at around 50% load PSUs have the best efficiency.

 

example EVGA 750G2

So highest efficiency at 300w which is about 40% load.

[FloRolf]

Accidential double post.

[MasterRaceMcqueen]

2 minutes ago, FloRolf said:

the 'w' correspondent?

Maybe you shouldnt build a watercooled high end pc if you don't know what the w is?

 

But yes, at around 50% load PSUs have the best efficiency.

Watt = electrial unit

[MasterRaceMcqueen]

5 minutes ago, FloRolf said:

 

so it's bad to take the 650w seasonic?
it's the numer 2 in the list... 

[Enderman]

1) buy a good quality PSU first of all, seasonic is great

 

2) the efficiency difference between 50% load and 90% load is very little, like a few dollars a year

 

3) the amount of money you will spend on a 2x more powerful PSU is way more than this little electricity saved by higher efficiency at 50%

 

4) The peak efficiency will depend on the PSU, they are not all the same, it is usually about 50% but can be more or less

 

5) The point of buying a more powerful PSU is almost always for upgradeability, not having a few percent better efficiency

 

6) If you care about a few dollars per year efficiency, like if you live somewhere where power is extremely expensive, they buy an 80+ titanium PSU.

[mariushm]

It depends on the power supply, but generally you want the power supply to be most efficient at the amount of power your computer uses for most of the time.

 

80% Bronze rated power supplies have efficiency rising slowly usually up to around 50% and then they're slowly decreasing in efficiency :

 

 

For example, the Cougar LX 600  (600w psu, bronze efficiency)  peaks at around 300w , which is 50% of its maximum output power.

 

Gold/Platinum/Titanium have more aggressive curves - they go up in efficiency much faster and stay at peak efficiency for a wider output and then decrease in efficiency much slower

For example, see this Super Flower 650w power supply (with platinum efficiency) :

 

 

You can see the differences : at 100w ( more than what a regular desktop these days uses when you're not gaming or doing something cpu intensive) , the bronze psu was only 84% efficiency, while the platinum power supply was already at around 91%. This particular platinum power supply peaks at around 275w (less than 50% of its output power) but its efficiency decreases so slowly it's basically more efficient than the bronze rated power supply even at is maximum power output. 

 

Here's another example, a Gold efficiency 550w psu (FSP Hydro-X) :

 

 

So you can see what I said about how fast the power supply becomes efficient remains valid - this one is not as slow ramping up its efficiency but isn't quite as good as a platinum or a titanium psu. The efficiency also drops much slower once it reaches a peak.

So this power supply would be best for example if your computer uses between 200 watts and 400 watts when you're gaming or encoding videos (basically something that uses more power) and it would still be efficient when you're browsing the Internet or watching movies (less than 100w)

 

additions:  anything higher than gold efficiency in general won't help you save more money. With a gold efficiency power supply, if you keep your computer running for 8 hours or more in a day, you'll probably recuperate the money you spend over the price of a bronze rated power supply in about 2-3 years. So in general, it's worth going with gold rated power supplies.

 

 

[STRMfrmXMN]

First of all, how do you know your chip will hit 5.0 GHz

[MasterRaceMcqueen]

29 minutes ago, mariushm said:

It depends on the power supply, but generally you want the power supply to be most efficient at the amount of power your computer uses for most of the time.

 

80% Bronze rated power supplies have efficiency rising slowly usually up to around 50% and then they're slowly decreasing in efficiency :

 

 

For example, the Cougar LX 600  (600w psu, bronze efficiency)  peaks at around 300w , which is 50% of its maximum output power.

 

Gold/Platinum/Titanium have more aggressive curves - they go up in efficiency much faster and stay at peak efficiency for a wider output and then decrease in efficiency much slower

For example, see this Super Flower 650w power supply (with platinum efficiency) :

 

 

You can see the differences : at 100w ( more than what a regular desktop these days uses when you're not gaming or doing something cpu intensive) , the bronze psu was only 84% efficiency, while the platinum power supply was already at around 91%. This particular platinum power supply peaks at around 275w (less than 50% of its output power) but its efficiency decreases so slowly it's basically more efficient than the bronze rated power supply even at is maximum power output. 

 

Here's another example, a Gold efficiency 550w psu (FSP Hydro-X) :

 

 

So you can see what I said about how fast the power supply becomes efficient remains valid - this one is not as slow ramping up its efficiency but isn't quite as good as a platinum or a titanium psu. The efficiency also drops much slower once it reaches a peak.

So this power supply would be best for example if your computer uses between 200 watts and 400 watts when you're gaming or encoding videos (basically something that uses more power) and it would still be efficient when you're browsing the Internet or watching movies (less than 100w)

 

additions:  anything higher than gold efficiency in general won't help you save more money. With a gold efficiency power supply, if you keep your computer running for 8 hours or more in a day, you'll probably recuperate the money you spend over the price of a bronze rated power supply in about 2-3 years. So in general, it's worth going with gold rated power supplies.

 

 

Which one do you recommend for my system?

[MasterRaceMcqueen]

12 minutes ago, STRMfrmXMN said:

First of all, how do you know your chip will hit 5.0 GHz

I'm tempted to mark solved kkkkkkkkkkkk

[STRMfrmXMN]

7 minutes ago, MasterRaceMcqueen said:

I'm tempted to mark solved kkkkkkkkkkkk

Lol

 

For two 1080 Tis and a 7700K I would recommend a 1000W PSU.

[PSUGuru]

35 minutes ago, STRMfrmXMN said:

Lol

 

For two 1080 Tis and a 7700K I would recommend a 1000W PSU.

You can run that with an 850 watt with no issues.

[STRMfrmXMN]

39 minutes ago, QuantumElement said:

You can run that with an 850 watt with no issues.

Not saying that you couldn't but if he's planning on going balls to the wall then I would get a 1000W. If you OC a 980Ti it'll use 350W on it's own iirc and 1080 Tis use even more power so eh

[AntonChigurh]

58 minutes ago, QuantumElement said:

You can run that with an 850 watt with no issues.

Like @STRMfrmXMN said, if you're gonna go balls to the wall, do it right. Just one 1080ti is pretty power hungry, but he's gonna get two, along with an OC'd 7700k. Yeah, it'd run alright on an 850w, but that wouldn't leave much headroom tbh.

[wzrd]

16 minutes ago, STRMfrmXMN said:

Not saying that you couldn't but if he's planning on going balls to the wall then I would get a 1000W. If you OC a 980Ti it'll use 350W on it's own iirc and 1080 Tis use even more power so eh

I tested multiple PSUs in 1080 Ti SLI & 7700k systems recently, to try and decide what to ship them with as a standard minimum.

 

I used EVGA P2s to keep it as standard as possible, and it was the only PSU in which I had identical models of differing wattage. 650W shuts off repeatedly at stock, 850W is stable at stock but gets unstable with OCing, 1000W could handle max overclocking on GPUs and CPU.

 

For a single GTX 1080Ti, I found the 850W is plenty for max OCing of both CPU and GPU, and this is in systems with loads of other small power draws, like pumps, LCD fan controllers, flow meters, etc. Though I can't say as to where this sits on its efficiency curve, and it could still be a good idea to go higher, if only for redundancy.

 

Definitely not an exhaustive test and doesn't account for loads of factors, but @MasterRaceMcqueen can use this as a guideline. Hope it helps.

[STRMfrmXMN]

17 minutes ago, wzrd said:

I tested multiple PSUs in 1080 Ti SLI & 7700k systems recently, to try and decide what to ship them with as a standard minimum.

 

I used EVGA P2s to keep it as standard as possible, and it was the only PSU in which I had identical models of differing wattage. 650W shuts off repeatedly at stock, 850W is stable at stock but gets unstable with OCing, 1000W could handle max overclocking on GPUs and CPU.

 

For a single GTX 1080Ti, I found the 850W is plenty for max OCing of both CPU and GPU, and this is in systems with loads of other small power draws, like pumps, LCD fan controllers, flow meters, etc. Though I can't say as to where this sits on its efficiency curve, and it could still be a good idea to go higher, if only for redundancy.

 

Definitely not an exhaustive test and doesn't account for loads of factors, but @MasterRaceMcqueen can use this as a guideline. Hope it helps.

Well thanks for the info mah dude