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I'm not really picking up why it's so reprehensible for someone to jokingly pluralize Pentiums as Pentia. Can you explain?

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It wasn't a joke.

It's odd, but someone actually downvoted me for getting you to clarify that. Haters gonna hate, I guess.

And it wasn't incorrect either. -um is the ending for neutrums (actually neutra) and -a is the plural thereof.

True, except in that Pentium is an English neologism, and thus is pluralized like an English noun. Don't get me started on the plurals of octopus or virus, please.

Well, if my Latin knowledge hasn't abandoned me -um is the ending for masculine words whereas -a is used for feminine words. I suppose the proper plural of Pentium would be Pentii :p

-um would generally be a neutral-gendered noun in Latin. (You're thinking of -us as a masculine ending). Thus, Pentia is the correct pluralization.

However, Pentium was at best a pseudo-Latin brand name to begin with, and Pentiums is likely the least wrong pluralization in English.

Yeah, you're right now that I think about it (the example that reminded me is pluralizing walrus to walri). Personally I do this sort of thing just for personal amusement (as I imagine this persons boss did) rather then actual correctness.

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