And the LP in there would be for low Profile. The entry level card is based on Polaris 12 and has 512 Shader processors.  These cards feature a 128-bit bus, require no external power connectors, and will be available in 2GB and 4GB models.

For entry level cards the pricing is a bit spicy, $90 for the 2GB model and $100 for the 4GB version, the memory runs 7 Gbps. Radeon RX 550 have a Polaris 12 GPU with eight of ten Compute Units enabled, adding up to 512 Stream processors and 32 texture units. The cards will come clocked at 1203 MHz boost clocks, These cards have a 50 Watt TDP and have been fitted with two 50mm fans.

• Boost Clock / Memory Frequency 1203 MHz / 7000 MHz
• 2GB GDDR5

IO wise it has a HDMI connector (Version 2.0) and DL-DVI-D.

MSI Adds Radeon RX 550 2GT LP OC