https://www.techpowerup.com/291000/amd-to-refresh-the-radeon-rx-6000-desktop-series-with-faster-memory
 
AMD is preparing a round of updates to its desktop Radeon RX 6000 series in the wake of RTX 30-series models by NVIDIA, according to Greymon55, a reliable source with GPU rumors. The company could be leveraging faster 18 Gbps GDDR6 memory chips for the task. This wouldn't be the first RX 6000 series products with 18 Gbps memory, as the liquid-cooled MBA (made-by-AMD) RX 6900 XT that's exclusive to OEMs, already comes with 18 Gbps memory clocks.

Mass-production of JEDEC-standard GDDR6 memory chips with data-rates as high as 20 Gbps and 24 Gbps by Samsung is expected to get underway later this year. The company is already sampling these chips, and it's likely that they may feature in the next round of product-stack updates by AMD and NVIDIA. In the run up to its next-gen RDNA3 graphics architecture, AMD is rumored to be working on a refresh of RDNA2 on the new TSMC N6 (6 nm) foundry node that it already leverages for the entry-level "Navi 24" ASIC. This is expected to open up headroom to dial up engine clocks, and possibly support faster memory. As for this latest refresh with 18 Gbps memory, if AMD's naming convention for its mobile RX 6850M is anything to go by, the new SKUs could feature a similar "xx50" model numbering.
 
Memory refreshes seem like a good way to boost an older video card performance.