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Am I right to conclude the oversubscription 6:1?
No, it isn't quite that bad. The 3750G-48 has 52 (duplex) gig ports (discounting StackWise prots), so its 104:32 or 3.25:1.
The forgoing is for bandwidth, for PPS, the same 52 gig ports could demand up to (about) 75.3 Mpps, so 75.3:38.7 or 1.9:1. (NB: Effective PPS will usually improve with larger packets.)
