Many people have mentioned that thier macbook pro's wireless is not as good as that of the regular old macbook, but nobody has posted any numbers as far as I could tell so I thought it would be helpful to post mine. I own both a new MB and MBP (penryn). I was wondering for some time why the MB seems to have better wifi performance than the MBP. Yesterday I found out. I downloaded the application AP Grapher which measures the signal, noise, and throughput of all detectable wireless links to both macs and ran some tests. You can get AP Grapher from Apple here: http://www.apple.com/downloads/macosx/internet_utilities/apgrapher.html I have two wireless routers. One is a Netgear 802.11g and the other is an Airport Express 802.11n. In all tests the two macs were side by side approximately 12 feet from the Netgear and 20 feet from the Airport Express. The test was conducted inside my house. For the first test I put the Airport Express in 802.11g compatible mode at 2.4 GHz. As you can see from the screen shots, the MBP received much less signal from both routers. Compared to the MB, the MBP saw 15 dB less signal from the Airport Express, and 7 dB less from the Netgear. Since every 3 dB represents a doubling of the signal strength this means that at in the case of the -15 dB drop the MBP is seeing only 1/32nd the amount of signal the MB is. No wonder it doesn't work as well out on the porch! Even at this signal level both macs were able to maintain the 54 mbps "g" link most of the time. In the second experiment I switched the Airport express to 802.11n mode 2.4 GHz. I also included the color guide so you can see what each of the colors corresponds to in the graphs. I forgot this in the first set. In this test you can see that compared to the MB, the MBP received 6 dB less signal from the Airport Express, and 10dB less from the Netgear (which was still at 802.11g). But what is more interesting, the MB was able to maintain a 65 mbps link on the "n" whereas the MBP was only able to maintain a 26 mbps link from the same router. Conclusion: The MBP wireless (WiFi) performance is significantly worse than that of the MB in identical situations using both Apple and Netgear routers. The received signal strength is about 7-15 dB lower on the MBP. This will significantly effect the range, throughput and reliability of the link. Some say this performance drop on the MBP is due to the aluminum case. I am not sure, but it stinks. I am thinking of selling the MBP now since range is important to me. I doubt this can be fixed with SW. Are the MB Air's any better? Thanks for any comments. Rich NOTE: The plots are labled so you can tell which is MB and which is MBP if you click on them, but the ones on the left should be the MB in any case. The performance at 5GHz (not shown here) was even more in favor of the MB.