I have personally tested these cards to have 5GHz
AR5BXB92 this is listed by lspci as atheros AR928X
it has 2.4GHz and 5GHz
AR5B22 this has 2.4 and 5GHz
lspci listed as: Qualcomm Atheros AR9462 Wireless Network
Adapter (rev 01)
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The following cards DO NOT have 5GHz, only 2.4
AR5B95 this only has 2.4GHz
lspci listed as: Qualcomm Atheros AR9285 Wireless Network
Adapter (PCI-Express) (rev 01)
AR5B93 this only has 2.4GHz
lspci listed as: Qualcomm Atheros AR928X Wireless Network
Adapter (PCI-Express) (rev 01)