I'm using a B550M K motherboard with a Ryzen 7 5700G, which limits the system to PCIe 3.0. I'm considering an RTX 5050, but since it uses an x8 PCIe connection, I'm concerned that the reduced bandwidth could bottleneck it enough to make it slower than my GTX 1080. How much performance would I realistically lose, especially in newer games?
4 Answers
The RTX 5050 probably wouldn’t become outright slower in every game just because it’s running at PCIe 3.0 x8. In most situations, the performance loss should be modest, and features such as DLSS and frame generation can make it more useful in newer games. However, the results may vary by title, so the two cards could end up fairly close in some workloads.
The main concern is running out of VRAM. When an 8GB card has to move data through system memory, the limited PCIe 3.0 x8 bandwidth can cause much worse stuttering and 1% lows. If the game stays within the card’s VRAM, the difference between PCIe generations is usually much smaller.
The PCIe 3.0 limitation comes from the Ryzen 7 5700G, not necessarily the B550 motherboard. That processor only provides PCIe 3.0, even though many B550 boards support PCIe 4.0 with a compatible CPU.
If you already own the GTX 1080, switching may not be worthwhile unless you specifically need newer features, better ray-tracing support, lower power use, or DLSS/frame generation. Depending on the game and settings, the RTX 5050 and GTX 1080 could trade places, while the 5050 should generally be the better long-term option if VRAM usage stays under control.
So the advertised small PCIe performance difference only applies when the GPU isn’t exceeding its VRAM. Newer games and high settings can make that distinction much more important.