As noted in the link below, only a Smart-1 25b supports R80.10. The difference between a Smart-1 25 vs. 25b is 4GB of RAM in the 25b as well as a slightly upgraded 2-core processor (Intel Core2 Duo Processor T7400 2.16 GHz).
Support Life Cycle Policy | Check Point Software
Note however that "supported" will definitely NOT mean "runs with good performance" in this case. The 25b is literally scraping against the bottom of the barrel in regards to hardware specifications to run R80.10, and the lack of at least 4 cores will mean SmartLog/Log Indexing will not be enabled. I'd strongly suggest trading your 25b in for a new Smart-1, as I can pretty much guarantee you will not be happy with the management performance of that box under R80.10+ in anything other than a lab environment.
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Gateway Performance Optimization R81.20 Course
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