mgcarley
Founder, Hayai Broadband
Could it be you mean 400 kilobytes per second? If so then bytes are normally abbreviated using a capitalized B while a small b is used to denote bits. So you should say 400 KBps.
Or we could just eliminate all confusion and say 400kbit/s or 400kbyte/s.
Or we could just eliminate all confusion and say 400kbit/s or 400kbyte/s.