00011.03 : 7000X 2x XR5 420 RGB Airflow Diagram

Why do the top fans draw hot air into the chassis? Why not exhaust from the top?

2 hours ago, vett93 said:

Why do the top fans draw hot air into the chassis? Why not exhaust from the top?

a fairly outdated way to do things buddy, a lot of us run our cases with only the rear fan as exhaust, the whole cold in the front and hot out the top has changed somewhat since we lost HHD cages and IDE cables etc and gained air flow. in reality the heat exhausted from your rads isnt as warm as you think it is when using multi rad systems. not only that. all these intakes are filtered. that and positive pressure makes for a fairly dust/fluff free case..  hope this helps 🙂

If the top was exhaust with a front radiator as intake ... the front radiator's heat would be going into the top radiator, significantly reducing the top radiator's performance.

I could make it all reversed with only the intake in the rear - a negative pressure system. While this does have some advantages, I also have 2 cats, 3 dogs and a 12 year old in the house. Positive pressure is a must.

Finally - the glass top and front won't work well for exhaust. They act as a barrier to getting the heat out and then the waste heat builds up ... again, reducing radiator efficiency. With intake and the glass, this isn't an issue (though the glass does reduce airflow). The side fans provide additional cooling. This actually works pretty well - I do monitor the delta between the intake air (from the side) and the exhaust air (in the back). That's usually around 5-6 degrees C, so not a heck of a lot. As @Zotty said, the exhaust from the radiators will be around the coolant temp ... so it's not that bad.

The diagram seems to suggest that it has 10 fans as intake and only 1 fan as exhaust. Is this correct?

I posted earlier about my Corsair One Pro experience where hot air is drawn from the radiators to inside and then exhaust from the top. I think it got deleted by someone. 

 

Well, I can't speak to anything being deleted. Don't know at all about that.

I have 16 fans as intake (the radiators are push/pull, so a total of 12 radiator fans) ... and yes, 1 exhaust. That's a positive pressure system ... where there is more air intake than exhaust. Since the volume of the case doesn't change and it's certainly NOT enough pressure to blow the case apart, the rest of the air is exhausted through the cracks and various vents and holes in the case. This works to keep dust from coming in through those unfiltered openings. It's the same kind of thing that you see in commercial buildings - ever open a door and feel a big whoosh of air rushing out? That's positive pressure. It's not as extreme in the case but the principles behind it are the same.

Edited November 17, 2021 by DevBiker

And don't forget about the glass ... doing the radiators as exhaust in the 7000 chassis will really only work well if you have the Airflow top and front. These are completely interchangeable though - you can swap them out as you wish.

@DevBiker

I understand the benefit of positive pressure. But your design just seems a bit excessive. 🙂

In my deleted post, I was saying my Corsair One Pro has the heat from the two radiators sucked into the chassis too. It warms up the components. Corsair has to de-tune the CPU power by 15% to keep it from crashing. I noticed the SSD reached 68C while I was doing stress test to the CPU and very little SSD i/o. Earlier Corsair One users reported early death of their SSDs!

 

It's not the excessive. Plenty of folks with 1000D's are running 30 or so fans ... with 2 exhaust.

The key thing to consider is the glass. If you have the tempered glass for the top and the front, you do not want it as exhaust. The glass panels will trap the heat. If you have the airflow panels for the top and front, then using those as exhaust would be feasible.

On 11/16/2021 at 5:12 PM, Zotty said:

a fairly outdated way to do things buddy, a lot of us run our cases with only the rear fan as exhaust, the whole cold in the front and hot out the top has changed somewhat since we lost HHD cages and IDE cables etc and gained air flow. in reality the heat exhausted from your rads isnt as warm as you think it is when using multi rad systems. not only that. all these intakes are filtered. that and positive pressure makes for a fairly dust/fluff free case..  hope this helps 🙂

Doesn't your 1000d have the top fans as exhaust ?  The pic I saw of it shows the top fans as exhaust.  

So if having the top as intake is a better way, then why are your top fans set for exhaust ?

Just wanting to know which is truly the best way to setup air flow, top and front intake or top exhaust as heat rises and front intake ?

 

There's no one 'best' way. It depends on what your needs are and what's important to you. There's a lot of variables. Performance is one - but so is keeping dust and pet fur out (for me), restrictions on airflow caused by solid glass panels, and the aesthetic effect that you are looking for.

Purely for cooling performance, negative pressure (with the airflow panels) is supposed to be the 'best'. But it's not going to be massively better. Negative pressure isn't feasible - at all - with the glass panels (or any solid panel, for that matter). Negative pressure will also give you cooler internal case temps. But negative pressure absolutely, positively will not work for me and my use case. No how, no way.

The cooling on my case is excellent. Nothing gets very warm at all. I'll run Folding@Home and only get to around 38-42C (depending on ambient temp) ... and that's with a ThreadRipper 3960 and an RTX 3090.

 

Which component has 38-42C temperature? What is the temperature on SSD when you stress the CPU and GPU for some period of time?

That's the coolant temp at the pump. I also measure the exhaust temp, the intake temp, and temps in 4 different places in the loop.

CPU temps at (relative) idle are 40-50, which is fine for a TR. At load, it'll get up to around 75 at 4.0-4.2Ghz across all 24 cores. GPU temps hover about 2-8C over liquid, depending on load.

SSD? Which one? I have 4 PCIe 4.0 SSDs in there. They have the motherboard heatsinks. Never had 'em throttle.

Look - you do what you want to do. But ... if you put the top as exhaust with the glass, it's going to be a problem. This is what works for me. I've detailed why. Performance and cooling is great, especially with the heat load that I can generate.

Oh ... and btw ... this issue with top exhaust? Any case with a solid top. Came across it first, here on the forum, with a BeQuiet case. And we see it all the time around here on the forum.

 

I fully agree that one should remove the glass. That is not the point of my comments/questions. We can shelf the discussion of the glass for now.

I see a benefit of intake air flow from the radiators: the coolant is cooled by cool air from outside. My concern is that it will generate heat on the internal components such as SSDs. This is exactly the issue I have with my computer.

My computer has 5950x/3080Ti and two radiators as well. It also has intake airflow like yours which draws outside air through radiators into the chassis and then exhaust. If I stress test the CPU, the SSD would reach 68C with very little I/O to it. 

That's why I asked you about the temperature of your SSDs. IMO, if you stress the CPU/GPU hard and long enough, it will heat up the internal components. If you also do a lot of I/O to the SSD, I bet it will throttle!

On 11/19/2021 at 3:22 PM, DevBiker said:

That's the coolant temp at the pump. I also measure the exhaust temp, the intake temp, and temps in 4 different places in the loop.

CPU temps at (relative) idle are 40-50, which is fine for a TR. At load, it'll get up to around 75 at 4.0-4.2Ghz across all 24 cores. GPU temps hover about 2-8C over liquid, depending on load.

SSD? Which one? I have 4 PCIe 4.0 SSDs in there. They have the motherboard heatsinks. Never had 'em throttle.

Look - you do what you want to do. But ... if you put the top as exhaust with the glass, it's going to be a problem. This is what works for me. I've detailed why. Performance and cooling is great, especially with the heat load that I can generate.

Oh ... and btw ... this issue with top exhaust? Any case with a solid top. Came across it first, here on the forum, with a BeQuiet case. And we see it all the time around here on the forum.

 

So, I have a 7000X, a 12700K, a FTW3 3080Ti, I have the 4 SP 140mm fans in the front and back, 4 QL 120mm fans on the side and 3 ML 140MM fans in the roof. I was thinking pushing into a 480mm rad in the side and a 420mm in the front and exhausting out the back and roof. I'll be running an EK Quantum Velocity Waterblock and a Quantum Momentum2 Monoblock for my ASUS Z690 Hero. 

So, are you saying the posiitive pressure of having the MLs push down and out the back might be better than pulling negative? I get that it would clean things up, but I want maximum cooling. I eventually would like to switch out all the fans for QLs and add push/pull on both rads, but I only have two commander core XTs and and a commander core and the little 6 fan hub that came with the case.

Even to run the RGB  now I think I'll need two of the ebay adapters to conver the DRGB of the EK blocks to Corsair.

Did you have any clearance problems running push/pull? Though I guess you are using the 5 series rads that come in much thinner than the 7 series.

Please let me know if you have any recommendations. Thanks!

No clearance problems, yes I'm using an XR5. Plenty of space in the top for the XR5 420 in push pull.

Negative pressure tends to be better cooling from everything that I've heard. That said, my configuration handles my ThreadRipper and 3090 just find and dandy, even under extended loads. Also, when you have intake through the radiators, you'll have the coolest source air for the radiators - that's not the case if exhausting through them. That said, the other components (VRM, memory, etc) do stay cooler.

In my household, though, negative pressure doesn't work at all. 3 dogs, 2 cats, kids ... there's just no way to keep things clean. That said, air filters are a good way to minimize dust and fur.

For the EK blocks, you'll need a PirateDog.tech adapter. They do work with those adapters.