MT7915D is a DBDC Module which support 2.4ghz and 5ghz in one module at the same time ...
in general it works now on latest DD-WRT x86 Firmware, but there are still frequent disconnects at 2.4 and also 5ghz in 1-3Hour Intervalls,, due to reKeying problems which are hopefully resolved soon...
if anyone else care to share his experiences , if he got similar modules. now is the time
and by the way, if anyone orders the AsiaRF modules directly , ask for a real heatsink, they can provide these - i got mine without real heatsink and the modules become very hot , the 4x4 Version up to 130 Degree Celsius under Load ...
i am looking forward to another moduel from Alfa Networks which i receive next week , with MT7615D chipset (ac only)