The Radeon 6750 XT is a minor refresh over what AMD already had in the market. It's essentially the same GPU with a small factory overclock which accounts for a small speed gain, plus the price hike.
The Radeon RX 6950 XT flagship refresh gets a performance memory boost to 18 Gbps GDDR6, which should help AMD in their halo product battle with Nvidia.
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The refreshed Radeon RX 6650 XT is simply an overclocked 6600 XT with faster memory. That's not big news, but what does make a difference is that the RX 6600 series is down near the MSRP.
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