If its a Prism card, using a GS router won't make any difference, afaik. The speedboost only takes effect when all wireless NIC's on the network are using Linksys GS 'standard' - same goes for any speed boosted G network (Belkin, Netgear, etc).
I found
this article about the 'real speeds' of Wireless -
Quote:
The fact is that real Wi-Fi speeds, measured in terms of file transfers, have always been slower than the claimed data rate. This is because headers, handshakes and other overhead take up a substantial amount of the available bandwidth. Here are the real file transfer speeds I measured with each class of WLAN product:
- 802.11b, nominally 11 Mbit/s, actual throughput 4.5Mbit/s
- 802.11g, nominally 54 Mbit/s, actual throughput 18 Mbit/s
- Boosted G, nominally 108 Mbit/s or 125 Mbit/s, actual throughput 22 to 24 Mbit/s
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So the bottom line would be that unless you have ONLY matching routers/cards on your network, 18Mbit/s is the max you will get if there are no B cards in range and you are in G mode.