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Does case size matter for temperatures?

Hi there,


this is just me being curious, but do properly ventilated cases that differ in size also differ in pc temperatures? Just to make sure, I am asking more about the more "normal" sized PCs, not extremes like full tower with >9000 3k RPM fans or ultra SFF, where everything is within a half cm of each other. And also let me just repeat that I am being simply curious, I am not planning on buying a new case anytime soon (been using NZXT H710i for few years now and even though I know it is not exactly the most airflowy case out there, I like the design and my temperatures are just fine (35-40c CPU, 41c GPU (zero rpm mode) when browsing web and when gaming, never over 80c on either).


It may seem like a totally stupid question, but to be honest when I think about it, I cannot really say myself.


On one side I'd say that in bigger cases, the higher volume of air helps soaking more heat from components, not to mention the fact that it is possible to use bigger motherboards, thus the components are not so crammed together, so they do not give each other as much heat.


On the other side I'd guess that in smaller cases it is easier for fans to move out the heated air more quickly out of the case and pushing fresh, colder air inside faster.


Then again if the bigger cases have more fans or 140s instead of 120s, it probably evens out?


Last three paragraphs are pretty much my own thoughts, so you can see why I cannot put my finger on the matter myself.


Obviously, there will be the extremes, there is the fact that for any proper conclussion it will always depend on the exact case in mind and its fans setting etc. but is there a general rule that most of the time can be used?


Thank you for your time and responses.

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If you take the Corsair 5000D and the Corsair 4000D for example, the 5000D is better in terms of temps. But it also comes with more fans out of the box. I'd say the difference would still be there if you spec them out with the same fans, but it's debateable if the slight advantage actually matters.

Current Specs:

CPU: AMD Ryzen 5 5600X - Motherboard: ASUS ROG Strix B550-E - GPU: PNY RTX 3080 XLR8 Epic-X - RAM: 4x8GB (32GB) G.Skill TridentZ RGB 3600MHz CL16 - PSU: Corsair RMx (2018) 850W - Storage: 500 GB Corsair MP600 (Boot) + 2 TB Sabrent Rocket Q (Storage) - Cooling: EK, HW Labs & Alphacool custom loop - Case: Lian-Li PC O11 Dynamic - Fans: 6x Noctua NF-A12x25 - AMP/DAC: FiiO K5 Pro - OS: Windows 11 preview - Monitor: ASUS ROG Swift PG35VQ - Mouse: Logitech G Pro + Powerplay - Keyboard: Logitech G915 TKL - Headphones: Beyerdynamic Amiron Home - Microphone: Antlion ModMic


Temperatures @steady state: Furmark + CinebenchR23 running for 1 hour. Fans @850RPM. Pump @1600RPM.

Water: 37°C

CPU: 73°C

GPU: 54°C

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All that matters is airflow. Bigger cases can have more airflow and thus more fresh air comes in.


This is of course based on the assumption that they are all full mesh front.


The h710 cools better than than the other h510 simply because it has more holes for airflow because it is bigger. It still has bad airflow but just has access to more air intake than it's smaller version.

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Well, you took out the two extremes, and that's where it matters, mostly on the smaller end.


The more tightly you pack the components, the more they share the heat each other give off. Also, smaller cases tend to offer less room for good cooling solutions.


Once you get to a compact mid tower size, though, it doesn't really matter any more. At that point, it becomes more about the airflow (openness of the case and size, number, and position of the fans, etc.) 

CPU: AMD Ryzen 9 5900X · Cooler: Artic Liquid Freezer II 280 · Motherboard: MSI MEG X570 Unify · RAM: G.skill Ripjaws V 2x16GB 3600MHz CL16 (2Rx8) · Graphics Card: ASUS GeForce RTX 3060 Ti TUF Gaming · Boot Drive: 500GB WD Black SN750 M.2 NVMe SSD · Game Drive: 2TB Crucial MX500 SATA SSD · PSU: Corsair White RM850x 850W 80+ Gold · Case: Corsair 4000D Airflow · Monitor: MSI Optix MAG342CQR 34” UWQHD 3440x1440 144Hz · Keyboard: Corsair K100 RGB Optical-Mechanical Gaming Keyboard (OPX Switch) · Mouse: Corsair Ironclaw RGB Wireless Gaming Mouse

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It all depends on the ambient temp inside the casing and how well the air circulates


Huge casing will have more volume to soak the heat, but require more time to dissipate the volume of air

Small cases can be better if you can ensure good airflow as the air gets drawn out before it's recycled


In the end, as long as your components are at good enough temps, I wouldn't worry about 1-2c

My PCs: Desky | Beddie | Miney | Benchie

Things I need help with: (nothing at the moment)


none atm

I hate Intel's pricing, Ryzen's weird quirks, Nvidia's pricing, and Radeon GPUs in general


Products I like:


Sony Xperia Z1 / Z2 / 10 ii, Asus Strix 970 / 1070, Samsung SSD, WD HDD, Corsair PSUs (AX, RM, CX(grey)), GeForce GPU, NZXT N450/S340, be quiet! Coolers, G.Skill Trident RAM, Logitech M525, Logitech G440, Razer Deathadder Elite

Products I hate:


Xperia Z3, XiaoMi 5c, Radeon GPUs, Razer Audio Products, any bloatwares

Companies I absolutely adore: (and hope it stays that way)


be quiet! - sent me AM4 mounting for my DRP3 even though it's way past the timeframe stated, no questions asked

Corsair - very good RMA experience, absolutely recommend

Companies I hate:


Nvidia, Intel, Apple, TMT (Thundermatch, a retailer)

Personal Blacklisted Companies:


Acer: shit tier quality products, shit tier customer service thus far, they "tried" to solve my issue but they arent really doing anything but delaying and delaying. (on-going case since July)

Gigabyte: horrible customer service (gigabyte had literally 0 customer service, asked me to go to retailer with NO WAY to email them about a question) but at least they fixed my shit in ONE MONTH (would probably take me 1 hour to fix if they let me email them)

XiaoMi Phones: built like a tank but the software is buggy as all hell

Seagate HDD: had too many dead seagate drives

Kingston SSD: 300V controller swap thingy

Razer (except their mouse)

Remember, just because I had good/bad experiences with these companies/product, doesn't mean you will have similar experiences too. I would still recommend these products if they made sense for your needs, but I'll add a disclaimer of my experience if it's relevant. Feel free to DM me asking why they are where they are.


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