Over kill? Why not try a chiller

 

Naah, you'll need at least a couple more MO-RA IV 600, and even so it will depend on the color... /s

 

Below is the cooling setup for two machines, with the 9950X3D and 4090 w/670W combo getting three x 64mm x 480 triple core rads with three x D5s. That cooling setup uses QD4s and was originally cooling a 330W+ Threadripper and 3x RTX GPUs w/dual PSUs - so to answer your question, as long as you get the required airflow for the rads, the setup you mentioned in the OP is 'much more than adequate'

 

Over kill? Why not try a chiller

Well, that would be nice, but I have my ice creams there, and I can't live without my ice creams.

Naah, you'll need at least a couple more MO-RA IV 600, and even so it will depend on the color... /s

If I install four of those, my PC would turn into a combat drone with LED lights.

Below is the cooling setup for two machines, with the 9950X3D and 4090 w/670W combo getting three x 64mm x 480 triple core rads with three x D5s. That cooling setup uses QD4s and was originally cooling a 330W+ Threadripper and 3x RTX GPUs w/dual PSUs - so to answer your question, as long as you get the required airflow for the rads, the setup you mentioned in the OP is 'much more than adequate'

View attachment 2715797

Thanks for the reply. Honestly, I don't want to build such a monster... I was worried that with how much power the 5090 consumes, it wouldn’t be able to dissipate all that heat. With my old setup, two 420mm 45mm radiators were enough to cool a 3090 and an overclocked 5950X.

 

Not even close.

 

I'm actually in the same boat myself with 2 420MM (push/pull fans on both) wanting to add a 3rd one

 

Airflow is important but the air temp i believe is more important. Can get away with much less rad if you can keep water temps down with cooler ambient air. If your room heats up over an hour even with all the rads its going to still not as good as you could be with less rads and cooler air. Sometimes thats hard to achieve though.

 

Why are you putting 3 fans on 4 fan radiators?

 

420mm Are 3 fan rads. 3× 140mm = 420mm. You're thinking of 480mm rads which take 4 × 120mm fans.

 

I was once told 100w per fan. So 2-3 fans for a big cpu, and 3-4 for a big gpu, because gpus tend to draw more watts. That’s 5-7. You’ve got what 9? On 12 fans worth of radiator?
me I would remove one row of fans from that push-pull and put them on the same sides as the fans that are there, making a standard 12 fan layout. 3x4 layout. Which should be good for 1200w. actual full on space heaters are 1500w. They may get bigger outside the US. 1500w is all that a 120v outlet can safely put out. So the room could need another air con. This is where I think the statement about chillers comes from. Could be wrong. I would also probably remove 1 420 radiator just to reduce resistance so the pump breathes a bit easier since it’s already 8 fans. I’m not you though.

 

Airflow is important but the air temp i believe is more important. Can get away with much less rad if you can keep water temps down with cooler ambient air. If your room heats up over an hour even with all the rads its going to still not as good as you could be with less rads and cooler air. Sometimes thats hard to achieve though.

This is difficult for me. I don't have air conditioning, and it's very hot in the summer. Even so, in the current system, my 3090 doesn't go above 47 degrees in winter and 52 degrees in summer. The processor (5950x) always remains stable at the same temperature.

Why are you putting 3 fans on 4 fan radiators?

But they are radiators with 3 fans, they are 3 of 140mm.

I was once told 100w per fan. So 2-3 fans for a big cpu, and 3-4 for a big gpu, because gpus tend to draw more watts. That’s 5-7. You’ve got what 9? On 12 fans worth of radiator?
me I would remove one row of fans from that push-pull and put them on the same sides as the fans that are there, making a standard 12 fan layout. 3x4 layout. Which should be good for 1200w. actual full on space heaters are 1500w. They may get bigger outside the US. 1500w is all that a 120v outlet can safely put out. So the room could need another air con. This is where I think the statement about chillers comes from. Could be wrong. I would also probably remove 1 420 radiator just to reduce resistance so the pump breathes a bit easier since it’s already 8 fans. I’m not you though.

I understand what you mean. Honestly, I’d love to run push-pull on both the top and bottom, but the case doesn’t allow it unless I use a smaller radiator, 30mm thick.

The 5090 Astral, from what I’ve seen, draws around 600–650W under full load, that’s about 6–7 fans just for the GPU based on what you mentioned. The 9950X3D, I believe, runs around 200–300W, so that would be another 3 fans, which adds up to around 10 fans total.

The pump is something I’m concerned about. I don’t know if the Alphacool VPP/D5 Apex will be able to move the whole loop without needing to ramp up too much. From what I’ve read, it’s quite close in specs to an original D5 but with less noise.

 

Due to your fan's performance and speed, also the pump speed.

Of course, the most important point is your room temperature.

Since it's not through compressor or phase change technology, the lowest temperature achieved by normal cooling methods is also equal to the room temperature.

So if the temperature is indeed too high, turning on the air conditioner might be the best option.

 

No. Tell your wife you need a MORA 600 and a Koolance water chiller to go with the 3 radiators.

Being serious, though, I really don't know. I imagine that should be plenty, as they're both long and thicc, but you're talking 1000 watts TDP just between the CPU and GPU if you're applying some decent OCs, so I really don't know if there's such a thing as "too many" or "too much" cooling capacity with a set up like that.

 

It will work. With 4 D5’s (160W heat generated), my 3090ti (it averages ~460W all the way turned up) + 14900KS (150W average while gaming) + RAM (12W while gaming) put 775W into the loop. I get 280-290 L/h, 9 Noctua 140mm fans on a single side of my MO-RA 420 and my water to ambient delta while gaming is about 6 Celsius.

MORA 420 has same amount of area fans cover as 3x 420mm, but my MORA is more like 70mm thick.

I estimate you’ll be somewhere in the 8-12C water to ambient delta range.

Your setup is certainly enough to function well!

 

3x420 radiator's would be perfect for a 5090. Single D5 even with 3 fast flow through radiators would be starting to stretch it, probably under 150L/H with the block. 420 single fan radiator would cool ~220W, with acceptable water temps and noise. I was thinking about making a fun small case build, 3 radiators, CPU and GPU block. Seems to about right atm. Jayztwocents personal 5090 rig only has two rad's (I think they were 360's) I can imagine how hot the water temps would get.

 

Which case are you using ?

 

3x420 radiator's would be perfect for a 5090. Single D5 even with 3 fast flow through radiators would be starting to stretch it, probably under 150L/H with the block. 420 single fan radiator would cool ~220W, with acceptable water temps and noise. I was thinking about making a fun small case build, 3 radiators, CPU and GPU block. Seems to about right atm. Jayztwocents personal 5090 rig only has two rad's (I think they were 360's) I can imagine how hot the water temps would get.

It's one of the concerns I had, but I've seen some builds with 3 radiators and the Alphacool VPP/D5 Apex pump, and I haven't seen complaints about low flow. We'll see if I end up regretting it and have to change it or add a second pump to the loop (hopefully not...)

Which case are you using ?

lian LI O11 Dynamic EVO XL

 

was running a 4090 with 600W Bios and a direct die cooled 9950X3D with 2x alphacool nexxxos XT45 280 x-flow and 1x alphacool nexxxos XT45 420 x-flow without issues, til wednesday this week, one of the 280 started leaking between tread and chamber, so not soldered properly...
temperature were not decent but still silent, all with one alphacool VPP apex pump, flow around 150L/h, 8-10° over ambient water temp...

 

Can you tell me what temperatures you had on the CPU and GPU, and what the ambient temperature was?