Followup -- I've found this page, listing network adapters compatible with jumbo frames:
I'm now trying to figure out from this list which is best for me. I'd like to get an active product over discontinued, a PCI-express over PCI (assuming this is indeed the faster option, someone please correct me if I'm wrong), and a single RJ-45 connector over dual or quad, since I only need one and price is a loose constraint. The 'F' designator, like XF, MF, etc., seems to indicate fiber, and I'd like a copper ethernet interface, so I'll stick to the 'T' models. I'll be back as soon as look into these options more.
Okay, so based on this post (http://forum.pfsense.org/index.php?topic=23934.0) it looks like only the PT series is a PCI-express series, the MT and GT series are PCI-x, so the PT looks like a good bet. The desktop adapter is now discontinued / not supported, so I'm leaning toward the Pro/1000 PT Server Adapter, part # EXPI9400PT.
One source of confusion -- the list of jumbo frame adapters here (http://www.intel.com/support/network/sb/CS-001911.htm) lists a PRO/1000 Gigabit Server Adapter, and I don't know what that card is. It's not listed here (http://www.intel.com/support/network/sb/cs-009221.htm) on the list of gigabit ethernet adapters.
Anyway, since the PT Desktop Adapter just got discontinued, I'm a bit leery of the server adapter in case it is also discontinued soon (it's been out since late '07 / early /08), so I wonder if there's a newer model that's still jumbo frame compatible that I should be considering. I think I'm done investigating this on my own now, so any additional help would be appreciated!
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I cannot think of any of the PCIe*-based Intel(R) Ethernet adapters that do not support 9K (9014) jumbo packets.
Consider using the Intel® Gigabit CT Desktop Adapter if you want the latest single-port adapter from Intel.