If your running dd-wrt with short preamble (under advanced wireless) you can expect about 90 to 100megabit's tcp throughput with a 20mhz channel and a 150 megabit rate in ideal conditions.
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wl500g.info/attachment.p ··· 42217711I can see here it has a broadcom SOC with a broadcom switch on a chip. Your probably going to see upwards of 130 megabits of tcp throughput from wan to lan even if the chipset does not support hardware ACK or checksum (If it does you can probably push close to 330megabit's+ wired if you use add an extra 5 bytes to the MTU).