How setup AES or TKIP on WPA-2 Personal Encryption mode?

I bought a Tenda wireless Router W268R.
Their support told me that it was necessary set WPA2-Personal Encryption Mode to AES (not TKIP) to permit computers an router shakehands in 150Mbps!
They told that TKIP does not support this speed. Router is set this way:
- WLAN Mode - mixed 11 b/g/n
- WLAN Operation Mode - Mixed Mode (not Green Field)
- WLAN Canal Bandwidth  - 20/40
- WLAN Reverse Direction Grant - set
- WLAN Agregation MSDU (A-MSDU) - not set
- WLAN Security mode - WPA2 - PERSONAL
- WPA Algorithm - AES (not TKIP&AES, not TKIP).
Anyway, I made the changes but my Macbook Pro i7, w/ Mac OS X Snow Leopard, OS and softwares just updated, is not getting this speed (at most, half of it). On the page of Tenda Router appears 20M, instead of 40M.
What should I do to get the best of my Mac?
Thanks all help, in advance.

802.11n ProblemTHIS DISCUSSION IS ARCHIVED
1. There is a archived discussion w/ the title above that shows same problem I have. Strangely, no solution was given at all!!!! Is this forum purpose solve user's problems? Strange! Absurde!
2. My MBP is still in 54Mbps speed and, like I said, I can't change the router to N-mode only, cause exists others computers without N protocol on my wireless LAN.
3. The router (Tenda W268R) is working with channels 8 (main - 2447 MHz) and 4 ( extention - 2427 MHz). These channels are working very well w/ an Acer Netbook => 150Mbps speed! (max of my router), even w/ a weak signal (of course the througput decreases, but handshaking are happenning in this speed).
4. Never heard/read about 5 GHz band on routers or MBP!? How can I see it in my MBP?
5. Please, I need HELP. It's impossible an up-to-date- computer like MBP work in a lower profile than an Aspire One Acer netbook w/ Athom processor!
Thanks, in advance.

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