2 iMac's on 10.5.5 with different airport speeds?

Hi,
Can someone tell me if this is right or not:
I have a home airport network of 2 iMacs. They work fine. BUT, one shows network speed of a max 48 Mbit/s and the other 130. They are both on 10.5.5.
Using the network utility(en1), one says Wireless Network Adapter (802.11 a/b/g) and works at 36-48. The other says Wireless Network Adapter (802.11 a/b/g/n) and runs at 130.
The slower (36-48 Mbit/s) has this Airport card:
Wireless Card Type: AirPort Extreme (0x14E4, 0x89)
Wireless Card Locale: USA
Wireless Card Firmware Version: Broadcom BCM43xx 1.0 (5.10.38.9)
Wireless Network Adapter (802.11 a/b/g)
The 150Mbits one's Airport card says:
Wireless Card Type: AirPort Extreme (0x14E4, 0x8C)
Wireless Card Locale: USA
Wireless Card Firmware Version: Broadcom BCM43xx 1.0 (5.10.38.9)
Wireless Network Adapter (802.11 a/b/g/n)
Also, on the slow one if I press alt whilst clicking on the airport icon it shows me the speed,
on the fast one that doesn't happen.
Question, shouldn't they both connect at 130 Mbit/s? Why the difference?
What is the solution.
Thanks.

Camelot wrote:
In this case the answers lies in:
Using the network utility(en1), one says Wireless Network Adapter (802.11 a/b/g) and works at 36-48. The other says Wireless Network Adapter (802.11 a/b/g/n) and runs at 130.
One of your cards supports 802.11n and the other doesn't.
802.11n is (currently) the fastest wireless standard. Early iMacs shipped with cards that, technically, supported 802.11n but it was disabled because the standard was in flux (not yet ratified) and Apple didn't make a compatible base station.
I'm guessing the machine that does support 802.11n was bought later, after the dust had settled.
For the older machines, Apple released an enabler (a href="http://store.apple.com/us/product/D4141ZM/A">available here to enabler 802.11n on the earlier systems. I costs $2 due to the license fees Apple have to pay. If you want both machines to run at 802.11n you'll need the enabler.
+802.11n is (currently) the fastest wireless standard. Early iMacs shipped with cards that, technically, supported 802.11n but it was disabled because the standard was in flux (not yet ratified) and Apple didn't make a compatible base station.+
Thanks so much. I checked the enabler download page and it said:
These Macs have the 802.11n hardware built-in:
MacBook Pro with Intel Core 2 Duo
MacBook with Intel Core 2 Duo
Mac Pro with AirPort Extreme option
iMac with Intel Core 2 Duo (except the 17-inch, 1.83GHz iMac)
The one which runs slower is an early White 17-inch, 1.83GHz iMac.
So, I assume the enabler is no good, and it will have to stay as is, which for my purposes is fine.
Thanks so much for your help and explanation.

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