That would be the clock speed, then you use DDR (x2) to get 2000.
Quote:
7. At what clock speeds does HyperTransport technology operate?
HyperTransport technology devices are designed to operate at multiple clock speeds from 200MHz up to 2.6 GHz, and utilize double data rate (DDR) technology transferring two bits of data per clock cycle, for an effective transfer rate of up to 5.2 Gigatransfers/sec in each direction. Since transfers can occur in both directions simultaneously, aggregate transfer rates of 20.8 Gigabytes/second and 41.6 Gigabytes/second can be achieved with 16-bit wide and 32-bit wide link configurations respectively. To allow for system design optimization, the clock speed of the receive and transmit links may be set at different rates.
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Taken from:
http://www.hypertransport.org/tech/tech_faqs.cfm