Hardware recommendations

Hi All, new member/first time post.  I’m building a new mini atx pc for use, i3 cpu, ASUS mb and 16 gb ram.  I know it’s overkill but not sure yet if the pc will be kept for use with UTM or retasked once I learn more.  Unfortunately I didn’t make note of the thread I saw and may try to find in my browser history, the thread mentioned sophos UTM can’t use that much ram and that it’s limited?  I’ve gone through a few of the hardware recommendation threads but couldn’t find any stating if there are limitations?

Anyone able to confirm?

Thanks much and apologies if a dumb question

Thanks

E