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Load balancing on consumer connections won't allow you to bond the two connections and combine the speed without you paying for a commercial endpoint at the other end. Thus you get two connections with the individual speed limits of each line, and will need to be doing that many things simultaneously to utilize the combined speed.

i.e. one download = 120Mbps, two downloads 2x120Mbps. One download split into two parts with a download manager = 240Mbps if you're lucky.

Similarly, you won't be able to send a 24Mbps HD video stream from your machine to elsewhere, but you can send 2x12Mbps streams. At least not without some dirty hacks.