Weird power draw figures(?)

[L. Kenter]

Hello everyone,

 

I upgraded my system a few months ago and I basically replaced everything except the case, storage, disk drives and power supply. Right now my setup is:
 

- i5 6600K @ 4,6Ghz (with Hyper 212 evo)

- Asus Z170K

- 16GB DDR4 HyperX Fury @ 2133Mhz

- Gigabyte G1 Gaming GTX 1070 

- Samsung 960 Evo M.2 250GB

- Seagate FireCuda 7200 RPM SSHD 2TB

- Unbranded 7-port USB 3.0 expansion card 

- 2x random disk drive

- CombatPower 750 Watt PSU

- Acer Predator G7200 case

 

- Philips Gioco 27" ambilight FHD LCD monitor

- generic Medion 24" FHD LCD monitor

- Madcatz MMO7 mouse

- Logitech G15 keyboard

- Logitech Z623 2.1 speakers

- some random USB accessoires, nothing power-hungry

 

Aside from the strange brand the PSU is getting a bit noisy and I'd like to replace it for a quieter and (semi)modular one. It's around 6 years old now so I figured it's time for a replacement.

I used outervision's website to calculate power draw and if I factor in my CPU overclock I end up with a recommended 541 Watts. However, if I set the overvolt on the GPU to 11% and the core clock to 2000 Mhz (which is what it runs at now) the recommended wattage shoots up to 794 Watts, which is more than I currently have, and it's working perfectly fine. Is the calculator correct here? Do I really need an 800 Watt PSU?

 

[Bananasplit_00]

you need like a nice 550W

[knightslugger]

4 minutes ago, L. Kenter said:

Hello everyone,

 

I upgraded my system a few months ago and I basically replaced everything except the case, storage, disk drives and power supply. Right now my setup is:
 

- i5 6600K @ 4,6Ghz (with Hyper 212 evo)

- Asus Z170K

- 16GB DDR4 HyperX Fury @ 2133Mhz

- Gigabyte G1 Gaming GTX 1070 

- Samsung 960 Evo M.2 250GB

- Seagate FireCuda 7200 RPM SSHD 2TB

- Unbranded 7-port USB 3.0 expansion card 

- 2x random disk drive

- CombatPower 750 Watt PSU

- Acer Predator G7200 case

 

- Philips Gioco 27" ambilight FHD LCD monitor

- generic Medion 24" FHD LCD monitor

- Madcatz MMO7 mouse

- Logitech G15 keyboard

- Logitech Z623 2.1 speakers

- some random USB accessoires, nothing power-hungry

 

Aside from the strange brand the PSU is getting a bit noisy and I'd like to replace it for a quieter and (semi)modular one. It's around 6 years old now so I figured it's time for a replacement.

I used outervision's website to calculate power draw and if I factor in my CPU overclock I end up with a recommended 541 Watts. However, if I set the overvolt on the GPU to 11% and the core clock to 2000 Mhz (which is what it runs at now) the recommended wattage shoots up to 794 Watts, which is more than I currently have, and it's working perfectly fine. Is the calculator correct here? Do I really need an 800 Watt PSU?

 

the calculators are a crapshoot. 1070's wont pull more than 175W, the CPU wont pull more than 120W, the rest of the MB wont pull more than 50W. i never saw my 6700k system with a 1070 in it (at the wall) power draw exceed 390W. What they are recommending is a PSU with that amount of output for safety reasons. a good PSU will negate those figures.

[Leonius]

3 minutes ago, L. Kenter said:

Hello everyone,

 

I upgraded my system a few months ago and I basically replaced everything except the case, storage, disk drives and power supply. Right now my setup is:
 

- i5 6600K @ 4,6Ghz (with Hyper 212 evo)

- Asus Z170K

- 16GB DDR4 HyperX Fury @ 2133Mhz

- Gigabyte G1 Gaming GTX 1070 

- Samsung 960 Evo M.2 250GB

- Seagate FireCuda 7200 RPM SSHD 2TB

- Unbranded 7-port USB 3.0 expansion card 

- 2x random disk drive

- CombatPower 750 Watt PSU

- Acer Predator G7200 case

 

- Philips Gioco 27" ambilight FHD LCD monitor

- generic Medion 24" FHD LCD monitor

- Madcatz MMO7 mouse

- Logitech G15 keyboard

- Logitech Z623 2.1 speakers

- some random USB accessoires, nothing power-hungry

 

Aside from the strange brand the PSU is getting a bit noisy and I'd like to replace it for a quieter and (semi)modular one. It's around 6 years old now so I figured it's time for a replacement.

I used outervision's website to calculate power draw and if I factor in my CPU overclock I end up with a recommended 541 Watts. However, if I set the overvolt on the GPU to 11% and the core clock to 2000 Mhz (which is what it runs at now) the recommended wattage shoots up to 794 Watts, which is more than I currently have, and it's working perfectly fine. Is the calculator correct here? Do I really need an 800 Watt PSU?

 

550 Watts is plenty fot that system. For some headroom you might want to grab a 650 Watt unit with gold certification, that will save you some power due to efficiencies at lower loads.

[Mira Yurizaki]

Most power supply calculators grossly overestimate the amount you need. Outervision's calculator for instance defaults to 90% load (which means everything is running at 90%). As a sort of verification to see how accurate they were for estimating power supply needs, I plugged my setup into their system, then ran Crysis 3 and checked power consumption using a Kill-A-Watt. I could not get even to 60% of what they were recommending.

 

After measuring my systems for the past 4-5 builds, I've pretty much settled on the following:

• Single high-end GPU with a high-end CPU: 300W minimum, but recommend around 450W-500W
• Each additional GPU: Add 200W
• Overclocking: Increasing the clock speed alone results in a linear increase in power. If you touch voltage, it's exponential. But I don't see overclocking say the CPU only adding more than 20-30W. The GPU may add ~30W or so.

So basically for your setup, 500W-600W should be enough as long as it's a decent quality PSU.

[L. Kenter]

Thanks everyone for the quick replies and for clearing this up! I will probably go for a Corsair TX550M V2.