Product: Coofun GK41 - 128GBManufacturer: BESSTAR TECH LIMITEDI am very impressed with this computer. I think this is a good computer to consider as a light media streamer (read on for operating system observations).This computer is pretty much ready to go right out of the box! It comes with 8 GB RAM installed along with Windows 11 installed on a 128GB M.2 SATA SSD card and an Intel Celeron J4125 CPU that runs its 4 cores (4 threads) at 2.0 GHz.I plugged mine in and waited for Windows 11 to go through its 'first boot' process. After about a minute or two I was able to get into Windows to start testing it.It truly does have 4k @ 60 Hz video playback in Windows 11. I am very impressed!In Windows 11, I checked out some YouTube 4k/60 Hz streams and watched with the 'stats for nerds' enabled. Out of 10,050 frames it only dropped 60 (~0.6% frame drop). That's not perfect, but it is pretty darn good. I could not visibly see any hiccups and the video playback looked buttery smooth. I did not test any games.Next, I popped it open to look at what is inside. There is a 128GB M.2 SATA SSD in my computer. Right beside that drive is a combined power/SATA cable for a 2.5-inch SSD/HDD ready to be used. I did try to plug in an NVMe PCI SSD but it didn't work at all - I did not troubleshoot it. So, I took out the M.2 SATA and installed Ubuntu 22.04 LTS on a 2.5-inch SSD. (tip: mash on the DEL key during boot to get to the BIOS to select the boot device)Video playback under Ubuntu 22.04 was both good and bad. It was really good on 4k Netflix playback through the Firefox browser. It was also buttery smooth when playing back some demo 4k/60Hz test files playing in VLC - 0 frame drops.The bad? In Ubuntu 22.04 YouTube streaming at 4k/60Hz was an abysmal failure in Firefox. I was experiencing 75 to 95% frame dropping - it was herky-jerky! I downloaded the YouTube video and played it back in VLC with 0 dropped frames. I didn't do any investigating to figure out the disparity.I *was* going to use this to experiment with Ubuntu Server functions since I'm currently reading Jay LaCroix's new book, Mastering Ubuntu Server. I chose this computer because I wanted a low power computer that I could leave on for long periods of time without feeling guilty. I measured 20W of power at its maximum draw. When it's idle it hovers around 5W - amazing. Now that I know how good it is at video playback, I might get another unit to use as my home media computer!