Apple TV networking and 802.11n

Do all apple TVs support 802.11N? I'm thinking about upgrading my home network and wonder if I will see a performance improvement with streaming media?
thanks

I upgraded from a g to an n network about a week ago. On the AppleTV, streaming worked just fine under g. The performance actually went down when I installed the n network. This was due to me using the default WPA2 encryption. I downgraded to WPA and performance went back up. I think it syncs a little faster with iTunes (both devices are wireless). And I think that downloads over the internet are a little bit faster, but not significantly.

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