First of all , I have seen this tweak in many places [including this forum

]
That tweak is about increasing b/w . A bit glimpse is about like this ..
go to this location ..
run ->gpedit.msc -> Computer Configuration -> Administrative Templates -> Network -> QoS Packet Schedeuler
Then at right panel , we have to select "limit reservable bandwidth" , right click it , select properties, then select "enabled" with 0% in Box.
Now tweak makers are demanding that , if your Qos Packet Scheduler is enabled in network card option , then you can feel that 20% b/w is increased.
My question : is this really true ? I mean how ms could be so dumb , they eat our 20 % b/w or this is all fake !!