Both sentences are grammatical, but long-winded. You'd more likely hear something like: Minimum requirements are a Pentium 4 PC. The minimum requirements are a Pentium 4 PC.
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MUSCOVITEI am 99% sure that (2) is OK, but (1) looks suspect to me (because of the -ing form, "be running")Your instincts are correct.
AnonymousThis software requires a Pentium 4 PC at the minimum.If you could also answer the following two follow-up questions?
CalifJimis grammatically correct, but only rarely used.Hello CalifJim! Thank you!
fivejedjoneven the non-subjunctive form is uncommon.Sorry fivejedjon, if you could clarify your point?
MUSCOVITESorry fivejedjon, if you could clarify your point?Did you mean to say that even "It is required that all users should run Pentium 4 PCs at the minimum" is uncommon in BrEng?That is not a subjunctive.
fivejedjonIn British English, even the non-subjunctive form is uncommon.?