Yep. The CPU is 500 MHz (vs 1 GHz for V2) and RAM is 128 MiB (vs 512 MiB for V2).
https://wikidevi.com/wiki/Samsung_SmartThings_Hub_v3_(STH-ETH-300)
https://wikidevi.com/wiki/Samsung_SmartThings_Hub_v2_(STH-ETH-250)
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