using speedtest.net to check speeds

[HAVOC]

Comcast is my cable/internet provider. I recently upgraded my up/down speeds. I if let speedtest choose it's own server based on ping (which is around 35~40) my speeds are not that great. If I manually choose a Comcast server (ping is 5~10) my speeds are where they should be based on the package I paid for.

Is this due to their "Powerboost" feature? Is there another way to check that will give me a more accurate picture on my speeds?

 

[boohbah]

speedtest.net is not actually that accurate, my isp has their own speedtest also and that is accurate .

try this one and see if it is the same as your isp or speednet
click in the yes field before starting the test

BTW Performance Test

 

[HAVOC]

Tried that and my speeds were close to what I pay for.

I've used speedtest.comcast.net and this is the result:
http://stage.results.speedtest.comcast.net/result/187792142.png

My question basically is, when you download a file (from any website) what server is used? Is it whatever server has the lowest traffic or lowest ping?