HWIC-1ADSL Speed issues

Hi experts, my ISP has connected our company with an ADSL2+ connection. When using our cisco 2821 with the HWIC-1ADSL, download speed is 8-9 mbit. But... when I use the cheap Zyxel that came with the ISP offer, I see download speeds of 12-13 mbit. Does anybody has a clue where the missing mb's have gone, and any help is appreciated ! Thanks ! Chris

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cristopher
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