If you wish to stress-test your Linux PC or your Steam Deck, it's now easier than ever thanks to OCCT. It released on Steam today with Native Linux support and a special optimized version for Steam Deck.
The Steam version is free but it has "optional non-recurrent purchase for users who want to unlock additional features or support development". Their team has also confirmed that an SSD test is planned and on the way but no exact date on that other than hopefully sometime this "Summer".
OCCT has tests for your CPU, GPU, RAM, PSU and more. It provides you with a special stability certificate for you, perfect for showcasing that new build.
Direct Link
Wonderful to see more tools like this arrive officially on Linux. Seems like it runs quite nicely on my Desktop (Kubuntu Linux) and my Steam Deck LCD. This is going to be really useful next time I build a new system or change an existing setup.
Here's how it would look doing it a test on Steam Deck:
See more from me
You can also find comments for this article on social media: 
robot2642 21 hours ago
grigi 20 hours ago
This is on the Steam Linux runtime 3.0, so it should provide a sane set of system libraries.
Running it directly on my Fedora system results in a segfault :-(
Stella 16 hours ago
robvv 13 hours ago
The Steam version is free but it has "optional non-recurrent purchase for users who want to unlock additional features or support development".That's non-recurrent.
Phlebiac 4 hours ago
That's non-recurrent.
Maybe there are other options, but the app itself pushes supporter subscriptions, in monthly and annual flavors. I just took a quick look, and thought it seemed rather sparsely featured for wanting a subscription.
Eike 29 minutes ago
I hoped for some fancy looking graphics test though.
It seems it does not have that?
Patreon
PayPal
How to get GeForce NOW on Steam Deck, SteamOS
How to install, update and see what graphics driver you have on Linux and SteamOS