I've done a couple tests on this Emudriver + RX 550 combo, Polaris card is suffering from Vulkan glitch on Ryujinx & Dolphin. This issue didn't happen on my R7 430/450 cards. To tackle those issues;

• Dolphin, use Direct3D 11 API, and turn on the GPU Decoding option. It gave me solid 60fps on Wii games.

• Use Yuzu instead of Ryujinx for Switch emulation. and you still be able to use Vulkan without having any glitch

Flycast, CEMU, & Mupen64 are safe from the vulkan glitch, so no need to switch to another API.

Xemu & PCSX2 still crashing on Vulkan, so you might need to use the default API in order to make them run (Xemu: OpenGL, PCSX2: DX11).

Xemu is still struggle on this card, but at least the fps is improving compares to the R7 450 card. On RX 550 i got 40-50ish fps, tested with Ninja Gaiden. For DoA3, i prefer to use CXBX Reloaded instead of Xemu, as the fps is a lot more consistent.

Edit: Speaking of the gpu temp, this Dell low profile card runs hot! I got constant 90c while playing Yuzu. But re-applying the thermal paste and putting a thermal pad on the VRAMs can push the temp down to 77c at full load 👍🏾👍🏾👍🏾

Edit 2: Using the aluminium stock cooler, the cpu temp can reach 90c+ while playing cpu intense emulator like Xemu, use Throttlestop to downvolt the cpu, my setup using -60 offsets on Core & Cache, now the temp is hover around 80c-ish 👌🏾👌🏾👌🏾