Transitioning to an x86 HTPC: Memory Bandwidth and DDR5 Performance in LibreELEC?

    Hi everyone,

    I’ve been a long-time user of LibreELEC, mostly running it on various Raspberry Pi models over the years. However, I’ve recently started hitting some performance walls, specifically when trying to navigate through a very large library using high-resolution skins or playing back high-bitrate 4K HDR files. The UI just doesn't feel as snappy as I'd like, so I’ve decided it’s finally time to move over to a dedicated x86 mini-PC build.

    I’m currently looking at a hardware kit that includes 16GB of DDR5-4800MHz (PC5 38400). I know LibreELEC is incredibly lean by design—which is why we all love it—but I’m curious if anyone here has noticed a tangible difference in real-world performance when moving to higher bandwidth memory like PC5 38400. In my current setup, library scraping and large-scale artwork caching can be quite sluggish, and I’m hoping the jump to DDR5 will help smooth out those background processes.

    One specific point I’m thinking about is the video buffer settings. With 16GB of RAM available, I’m planning to significantly bump up the cache size in my advancedsettings.xml to better handle uncompressed 4K rips from my local server. My personal insight from older builds is that more RAM usually helps with stability, but I’ve never worked with DDR5 on a "Just enough OS" (JeOS) like this before. It feels like a massive leap from a 2GB or 4GB Pi, and I want to make sure the OS actually utilizes that extra overhead effectively.

    Has anyone here gone the "overpowered HTPC" route with newer memory architectures? I'm particularly interested to know if the latest stable builds handle the newer chipset timings without any weird driver quirks.

    Does the community feel that the jump to DDR5 is overkill for a media center, or does that extra bandwidth actually help with 10-bit HEVC decoding and general UI fluidness?

    If you implemented cache fiddling on the current RPi4 setup; remove it and you'll likely discover things improve, esp. with LE13 images. Why? because there is a sizeable chasm between how most users think media streams and caching work, and how it actually works, which results in people with utterly moronic cache configurations. Unless your network is broken (in which case the solution is always to fix the network) there is no need for anything beyond Kodi defaults, no matter what some outdated reddit or Kodi forum thread armchair pundit claims or recommends. K22 has changed things quite a bit.

    RPi5 is a noticeable update on RPi4. Generic PC stuff is a little faster again. There is no performance difference between 4/8/16 GB RAM in terms of GUI and playback because 2GB is enough for 4K and the GPU and Kodi desktop resolution (and key-repeat/scroll speed of the remote device) dictate how fluid things feel, not RAM size. These days 16GB seems to be the minimum DIMM size that you can so not sure anything smaller is even possible. The difference between DDR4 and DDR5 is likely irrelevant for LE use.

    I have an RPi5 booting from an NVME drive (family daily-driver) and an Intel N150 box with eMMC storage (x86_64 dev work) and while the Intel box is technically a lot faster, the real-world difference is more marginal.

    What are you using for storage on your raspberry pi's? SD card or a SSD? In my experience this is the biggest factor in terms of UI snappyness.

    I agree a RPI5 with a PCIe SSD is comparable to my N100 box.