https://wccftech.com/xbox-series-s-ram-not-an-issue-but-gpu-performance-presents-challenges-for-future-titles-4a-games/

Ever since Microsoft confirmed the rumors regarding the so-called Project Lockhart console, which turned out to be the Xbox Series S, the game development community has split on the implications of having a much weaker min-spec hardware to deal with compared to PlayStation 5 and Xbox Series X.

So far, the general consensus was that the main difference lied in the smaller and slower RAM. The Xbox Series X features 16 GB GDDR6 (320-bit bus), 10 GB of which run at 560 GB/s, while the remaining 6 GB run at 336 GB/s. The Xbox Series S hardware, by contrast, is limited to 10 GB GDDR6 (128-bit bus), 8 GB of which run at 224 GB/s, while the remaining 2 GB run at a mere 56 GB/s. The CPU is practically identical, with only a 0.2 GHz difference in favor of the Series X, while there are 32 more Compute Units in the Series X's GPU - but then again, the smaller sibling only targets 1080p resolution (or 1440p at best), while Series X is meant for the much more taxing 4K gaming experience. The resolution drop should be enough to equalize the GPU potential, or so it was believed.