560mm radiator is plenty for an 8700k and a 1080ti, right?

[Ferzerp]

I know the answer to this, and I'm not sure why I am even posting the question, but here goes.

I am building a new system and am sharing a single cooling loop with a 1080ti and an 8700k. It's a 560mm radiator, and an EK-XTOP Revo D5 PWM pump. I'm going to be using bequiet BL071 fans in a (probably) push configuration. The goal is minimal fan noise.

I assume that it is so hilariously oversized that having both of them in the loop isn't going to appreciably affect coolant temps at all, but I figured I'd ask.

 

[Hendrickson]

That should be more than enough. 360mm of rads would be enough assuming you aren't pushing overclocking way high, and you have good fans.

I have 600mm (5x120) of rads on my 1800x/1080 build, and the cooling is ridiculously over the top even for heavy OC. It's more of an aesthetic thing on that build though.

 

[Ferzerp]

This is a single 560mm EK radiatior (it's going in a Thermaltake the Tower 900, so plenty of room for it). I will be overclocking everything, yes, but not to the level that voltage (and noise) starts to spike. I want quiet and fast as opposed to just fast.

edit: Well, the EKWB configurator also suggests that that is plenty as well, so yeah. I knew the answer really but I wanted to double check. I have, in the past, just used 240mm AIOs for CPU and 120mm AIOs for gpu. There is no reason putting them together would require more cooling.

 

[Hail The Brain Slug]

I feel like there are varying levels of cool and varying levels of quiet when it comes to custom loops.

I built a loop over the summer that started out with one 420mm EK radiator. I thought it would be enough for my 5960x and 1080ti FTW3. I decided last minute I should add another radiator to make sure it was overkill, so I added a 240mm Monsta.

The coolant temps were higher than I was hoping for, despite all the online calculators. Fan speeds were way up just trying to maintain good coolant temps (under 32C). I ended up squeezing a 140mm Nemesis GTX in, and I feel like between all three radiators it's still too loud to keep coolant under 32C.

If I was happy with 35c coolant temps, I could probably have much lower fan speeds and noise, but I expected better from all three radiators.

 

[aigomorla]

u don't skimp on radiator if noise is your primary.

That being said, no its not oversized at all considering that gpu itself is recommended at 120x2 as a minimum on that class of gpu, and AIO's have mediocre performance on a hexcore at 120x3.

will it work, yes it will probably work provided you have enough flow to main 1.5gpm, to net a 350W carrying capacity.

is it optimal; for a silent system... no... i would not put any fans on that system which were not raited at 1800rpms as a max unless you can somehow add a bit more radiator. Also the type of radiator used would be very important as in the fpi.

 

[Ferzerp]

It isn't silent, but low noise. It has been plenty so far for it. The GPU can draw up to 310W the way I have it now, and the CPU will actually draw 180W up to with an AVX2 workload. This is actually super close to what EK estimated when I used their configurator and it suggested a 560mm radiator. It estimated 505W, and the two can total 490W. Now, since the CPU only draws 120W in non-avx workloads, and that's with a synthetic 100% load, there is a ton of real world headroom. The GPU, though, can easily hit that 310W when I am playing games. The CPU though ends up more like 50W at the most while the GPU is loaded like that.

The CPU power usage will go down once I stop just using "auto" settings for the OC.

 

[aigomorla]

You do not estimate heat values soley on radiator.

This is not how thermodynamics works.

You also need to account for FLOW.
FLOW determines how much heat can be carried and released in a system which tries to net equalibirum.
So any calculator which does not account for flow, is a WRONG calculator.
Also radiators work more efficiently as you net a greater delta from ambient to watercoolant temp.

So calculators are more or less MOOT, we just hypothetically pick a random number where we assume a good delta can be maintained if FLOW is not starved and say use that.

Personally i use 150W per 120x1 @1.5gpm flow to net a average of 3-5detla T when using 1800rpm fans.... You see how precise the conditions needs to be to assume radiator size? not many people can approximate that detail of numbers, so we mostly say just overkill it on radiator for silent if you have flow, and overkill on flow if your after space with minimal radiators.

Martin's Liquid Lab had a great calculator but i think its gone.

Also i do not like offsize radiators...
Offsize meaning 140mm, 92mm because of the selection in FANS.

Unless you intend to pair this radiator with 140mm Noctua's Industrials 2000rpm fans, a 120x4 with per say Gentle typhoons will probably net u a better performance on it, with ANY other 140mm fan used in the same config at the same noise.

 

[Ferzerp]

It's already built and working fine. I trust EK's recommendation of sizing when I went with the whole solution they configured (except fans, I swapped out, and I also increased the reservoir size purely for aesthetics)