RAS Capable devices

I am looking for a list of multi-serial port devices which I can attach to the NT Server for Remote Access Services. Is it also possible to find out what the performance factor is when one uses 1 ftp connection versus 8 simultaneous ftp connection or 64 connections.
I am currently using a non-intelligent digiboard multi-serial card with NT Server using RAS and IIS 2.0 on a 300 Mhz Pentium II with 64 Meg RAM. I get a degradation of around 100% in file transfers when 8 users are simultaneously downloading files using FTP compared to one user.

Thanks a lot
rianAsked:
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bbaoIT ConsultantCommented:
You may find the list of multi-serial port devices from NT's HCL (Hardware Compatibility List). It is a .hlp format file contains lists of all the devices that confirmed to be compatible with NT. The HCL is on your NT CD-ROM.  For the latest version of HCL, please download it from M$ website.
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