When running the 100/133 operation, VIA called this mode pseudo-synchronous because while it really isn't that much different than the 133/133 mode, it operates by buffering the incoming data for a short time and denying requests from the memory that may come in faster than the bus needs.
Frankly, you lose a little performance- but I can't say it would be more than 5%
The thin with the Athlons is that they REALLY like their FSB bandwidth to be clear so using the 266 speed does improve performance a little.
Eric
Discussion Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)
Discussion Intel current and future Lakes & Rapids thread
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