Quote from fareastcoast:
I think it is worth pointing out that receiving iqFeed over the internet is going to cause you to drop ticks. During busy sequences, even for the top 3000 symbols only, if you are aggregating from all exchanges, you will easily saturate a 1GBit link. In fact, in the exchange colocation world, 10GBit is now the new standard. So since you are already bandwidth limited, transmitting indicator data in addition to raw price data is simply making your bottleneck smaller.
The max symbol limit in IQFeed is 1800 symbols. Thus, you are right, you won't be able to watch 3000. 1800 of the most active symbols won't come anywhere near 1GB.