I have router Draytek Vigor 2100VG at home almost in the center of it.
The farthest point at my home is my balcony, ~12m from it.
I have constant wifi signal range problems with some of my devices, but not with others.

• Notebook Lenovo W510 - no problems
• Nokia Home Music - always on 10m - no problems
• Sony PS3 - always on 7m - no problems
• Sony tablet S - problems around 6m
• Sony PSP - problems around 8m
• Sony PS Vita - problems around 8m
• Nokia E63 - problems around 8m

I'm curious why my Notebook don't have any problems even on the balcony? I guess it has better hardware or uses more power for transmission.
This information is really important when you want to buy new device/computer, so my real question is:

1. Can device wifi range can somehow be found/suggested from official hardware technical specification?
   If not
2. Is there some web page with wifi range reviews?