How do you know if your Mac is 2.4 GHz or 5 GHz 802.11n?

We have a 2007 iMac and an original MacBook Air, which were both bought in January of 2008. And a brand new 17-inch MacBook Pro. Our Time Capsule is the older non-dual band model which was bought with the iMac and MacBook Air, again in January of 2008.
If they are all 5GHz, I would think I would want to set the Time Capsule's Radio Mode for "802.11n only (5GHz)."
Assuming that they are all 5GHz, is this what I should do for maximum efficiency, or does it really matter?
(And yes, I know that our iPhones would not be able to use the 5GHz band. Not a problem)

That's true. Apparently the 5Ghz band can use 40 mhz bandwith, rather than 20 mhz, which when combined with the relatively few 5ghz devices, means it can be quite a bit faster. I routinely get about 8-10 MB/sec (that's 64-80 megabits/sec) with my 2007 Macbook Pro and my Airport Extreme base station (802:11n). The signal from the Airport Extreme is pretty strong across even from about 150 feet away, and through several walls, but the speed drops significantly (to around 2 MB/sec at best)
Unfortunately, I'm not sure how to confirm your Macs support 5 ghz, apart from simply trying to connect to a 5 Ghz only network. I would assume that since my late 2007 MacBook Pro supports it, your Macbook (and probably Macbook Air) will support it too. I can't say for the iMac.
You can look in the Airport section of System Profiler, then look for an entry like this:
Supported PHY Modes: 802.11 a/b/g/n
Note the 802:11 a - apparently the "a" refers to the 5 Ghz band, which is used by 802:11n. So, if it shows this, I figure it should work fine.

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How do you know if your Mac is 2.4 GHz or 5 GHz 802.11n?

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