Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

So here's the situation. I just started using usenet (server Newshosting), and I am on a bit of a limited bandwidth local network so I've been trying to figure out how much bandwidth I'm actually using. So, I run, tells me I'm around 4.5 Mbps-5.0 Mbps. I turn on my usenet client (SABnzbd), and it says the download speed is ~500 kbps. I run speedtest again, and my download speed drops to around ~0.5 Mbps.

So the math doesn't add up.

This is reproduceable, and I'm experimented with limited the bandwidth of the client to ~100 kbps, which gets me around 3.0 Mbps, so it's consistent with not downloading as fast as it claims.

Is there just a lot of overhead bandwidth involved in these usenet servers? Is there a specific reason this is happening? Can I do anything about it? Obviously, I'd like


share|improve this question
up vote 2 down vote accepted

Look more carefully. Your download speed isn't "500 kbps", it's "500 KB/s". The math does add up if you add numbers with the same units.

500 KB/s = 4.1 Mbps.

There are 1,024 bytes in a kilobyte. There are 8 bits in a byte.

share|improve this answer
Foolish me thinking b and B are the same. Perfect answer to an apparently dumb question. Thanks! – levitopher Mar 19 '13 at 4:38

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.