hi~ there~
I visited three news groups introduced in the link and I found that the price of unlimited bandwith is different.
I just wanna know the reason why the price is different.
Giga news is highest. right? Is that about diffenrce of feeding rate ?
I guess you mean 'news SERVERS', not 'news groups'.
Right now, mainly because of the near 'free fall' of storage (read: hard drive) costs, things are in extreme flux as far as pricing is concerned. Stay tuned closely for a fair amount of changes in this in the very near future, I think.
The transfer rate has a lot more to due with a host of factors other than the number (and raw speed) of what the provider can supply.
Do a trace route (tracert) from your machine to the server in question. Some news-servers have a 'reverse trace route' tool that will give you the same info, but from that servers 'perspective' from them back to you. Minimum number of hops, with minimal delays are, of course, better than the reverse (lots of hops with large delays).
You might find that a certain provider is 'closer' to you than another, and the routing to yet another goes through 'wacky' turns and such. You can't change that, it's whoever programmed the routers with the companies handling the traffic.
A good example is Giganews; it's server plant used to be in Phoenix, but in recent years got moved to the 'tech' corridor in Virginia outside of Wash DC, so if you're on the west coast, the bits have to crawl the 3500 miles cross country.
Then again, AstraWeb is headquarted in San Jose, so for those on the west coast, it's almost 'local'.
Things have, of course, gotten much better over the years. The speed and redundancy of the internetworks has gotten MUCH better (I, for one, guess I didn't waste my 30+ years engineering those systems for naught!).
The SSL question is really appropriate only for those on systems that the provider is using 'illegal' (according to the recent FCC rulings) 'traffic shaping' (better known as 'traffic management' to those using it)m slowing down certain protocols to provide more bandwidth to other money making segments of their business model (PPV, 'on-demand', etc).
Cablecos and a handful of very small telcos have, got appropriately 'wacked' (fined) by 'uncle charlie (the FCC), and have started to figure out other ways to ding (charge $$$) their 'customers'.
So, unless you need it to get around such restrictions (due to your local ISP), it may not be an issue.
So, a lot of factors enter into it, not just the adverts 'blurb' of that particular provider. What mix of speed/responsiveness/features is really very unique to each persons situation.