confusing, RK903 -2dbi but transfer rate at only 2xMb/s max

[ilearner]

what's wrong with it?
I placed this MK808b on the wireless n router, sometimes it's -2dbi and sometimes it's -41dbi, but not much improve on the transfer rate. 65Mb/s at speed link but only get 2xMb/s transfer max.
cx803 could get 150Mb/s speed link but only get 3xMb/s transfer rate max. My mobile phone can get 6xMb/s transfer rate around the same position.
It's a matter of the antennas they works with or it's a matter of the wifi chips?

does great connectivity (-dbi) not mean a better transfer rate?
Does an internal antenna have a better connectivity (in -dbi) than a conventionally external antenna?
does RK903 work poor compare to RTL8189ES?

[rishidoshi]

what's wrong with it?
I placed this MK808b on the wireless n router, sometimes it's -2dbi and sometimes it's -41dbi, but not much improve on the transfer rate. 65Mb/s at speed link but only get 2xMb/s transfer max.
cx803 could get 150Mb/s speed link but only get 3xMb/s transfer rate max. My mobile phone can get 6xMb/s transfer rate around the same position.
It's a matter of the antennas they works with or it's a matter of the wifi chips?

does great connectivity (-dbi) not mean a better transfer rate?
Does an internal antenna have a better connectivity (in -dbi) than a conventionally external antenna?
does RK903 work poor compare to RTL8189ES?

http://www.freaktab.com/showthread.php?4037-WiFi-LAN-copy-paste-speeds-i-get-max-1-1-MB-s