Do I need to upgrade my power supply (dual loops, sli etc.)

[r.perez]

Hey LTT community, 

I am in the process of upgrading my PC. New and bigger case, beefing up my custom loop and adding a 2nd 1080 in SLI. 

My current power supply is the EVGA SuperNOVA 850 G2. 

Currently, I am running the following hardware: 

Motherboard: EVGA z170 Classified K
CPU: Core i7 6700k @ 4.7ghz 

Memory: Corsair Dominator DDR4 3600 32GB (4x8GB)
GPU: EVGA GTX 1080 FTW @ 2000mhz 

Storage: 512GB Samsung 960 Pro M.2 SSD; 1TB Samsung 850 Pro SSD; 1TB Samsung 850 EVO SSD

Dual Custom Watercooling Loops:

Rad/Fans: 1 x 360 rad in push pull (6 x 120mm fans); 1 x 280 rad in push (2 x 140mm fans) 
Pumps: Pump #1 EK SPC-60 Acetal Pump; Pump #2 Not sure model but it's an EK D5 from my old build, purchased about 6 years ago

Upgrade will consist of the following for sure: 

1. Upgrading 280 rad to 560 rad in push pull (8 x 140mm fans) 
2. Adding 2nd GTX 1080 in SLI, expect similar overclock on 2nd card

3. replacing the SPC-60 pump with another EK D5 (so I will have dual D5 pumps). 

 

Also considering selling the Z170 board and 6700k and replacing them with a X299 board and i7 7820x 

I've used a number of PSU calculators online and gotten different results. At best I'm close to the 850 threshold (pulling around 775-815W), and worst I am over pulling somewhere in the 950w range depending on the calculator used. 

Thoughts? I'd love to avoid the extra cost of upgrading the PSU if it's unnecessary but I'm not sure. I have custom Cable Mod cables that I want to keep using, so I will stay with EVGA if I upgrade. 

 

[JHY]

850W is enough for your build

[Oshino Shinobu]

PSU calculators tend to way overestimate how much you'll actually draw. 

 

850W is more than enough for that 

[Billy_Mays]

Calculators tend to overshoot it a little bit so you have headroom for it

[JHY]

Also, go with ryzen 7 instead of upgrading to i7 7820x or just keep 6700k if you are mainly gaming...

[Badimir Putin]

I'm running a 6700K overclocked and two GTX 1080s in SLI overclocked on a Corsair RM850i. According to my in-line power meter, I never draw more than 500W from the wall. I'd say your 850W PSU will handle it splendidly.

[Lurick]

I'm running similar-ish components (980Ti instead of 1080 and a 5930K) and draw maybe 650W from the wall with the CPU and both 980Ti maxed out at 100% once overclocked. 850 Watts is plenty  

[r.perez]

24 minutes ago, PCNoobie said:

Also, go with ryzen 7 instead of upgrading to i7 7820x or just keep 6700k if you are mainly gaming...

I would go with Ryzen, but my memory isn't compatible. I will end up spending more for a Ryzen 7 1800x once you factor in the cost 32 GB of new memory.  And while I use this machine for 50% gaming, I also use this rig for editing video and photos.