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I don't really know. I'm pretty sure my upload is 384 kbps, because if I sustain that speed, my connection starts getting very laggy. It seems like my ISP (Comcast) allows burst uploads much faster than that for small files, but large files are stuck at 384 kbps. I have no idea what my downstream is, because it depends on the performance at a given website, and Comcast fakes out the measuring sites like speedtest and speakeasy.