The NP915S3G has a better Wi-Fi standard than most notebook PCs of a comparable spec and age to it. This notebook PC has an 802.11n wi-Fi standards, whereas most portable PCs that have been around for a comparable time to it have an 802.11b wi-Fi standards. This portable PC also has an 802.11g wi-Fi standards.
An 802.11n wi-Fi standards is in fact the best Wi-Fi standard across all notebook PCs of a comparable spec and age to the NP915S3G.
An 802.11a wi-Fi standards is the worst Wi-Fi standard amongst similar types of portable PC.