Secondhand PC hardware is incomparable with brand new Raspberry Pi.
In this sentence, is it correct to say brand new Raspberry Pi without making it countable? That is, a brand new Raspberry Pi or brand new Raspberry Pis
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Sign up to join this communityNo. It is not uncountable and therefore should be subjected to the normal rules of plurality (despite second-hand PC hardware being uncountable).
You can say:
Secondhand PC hardware is incomparable with a brand new Raspberry Pi.
Or:
Secondhand PC hardware is incomparable with brand new Raspberry Pis.
Admittedly, either is a little awkward, so you may consider rewording:
Secondhand PC hardware is incomparable with the brand new Raspberry Pi.