https://wccftech.com/xfx-releases-three-new-radeon-rx-6600-xt-series-gpus/

XFX has released three AMD Radeon RX 6600 XT series GPUs on their website. The new graphics cards will showcase 128-bit bus, 8GBs of GDDR6 memory, and 2048 Stream Processors. It will offer the new L3 cache, aptly named Infinity Cache, with a total of 32MB, which is close to three times smaller than the Navi 22 GPU models. The three XFX RX 6600 XT models are the MERC308, the QICK308, and the SWFT210.

First, the XFX RX 6600 XT Speedster MERC308 Black is their top of the line GPU in this series, offering a completely custom three fans to allow for expediting cooling throughout the card. It houses four piece copper heat pipes plated in nickel which is attached to the aluminum heatsink. The card offers fully covered cooling solution in the fact that the heatsink sits near the VRM sections and the cards base sits slightly above the memory and GPU. The logo has LED illumination with a dual-BIOS switch. XFX has not released much in the way of specifications when it comes to speed, so we will have to wait until the day of launch to see more details released.