HyperTransport (HT) is a technology for interconnection of computer processors. It is a bidirectional serial or parallel low-latency, high-bandwidth point-to-point link.
HyperTransport comes in four versions 1.x, 2.0, 3.0, and 3.1 , which run from 200 MHz to 3.2 GHz. It has maximum data rate of 6400 MT/s when running at 3.2 GHz. Theoretical transfer rate is (3.2 GHz × 2 bits/Hz × 32 bits/link ÷ 8 (bits per Byte)) in one direction - 51.2 GB/s total throughput. HyperTransport is packet-based, each packet consists of a set of 32-bit words, regardless of the physical width of the link.
AMD uses HyperTransport to replace the Front-Side Bus in many of their processor families. HyperTransport is capable of 32-bit width links, but currently 16 bits links are used by AMD processors. Some chipsets do not even utilize the 16-bit width completely.
| HyperTransport version | year | max. frequency | max. bandwidth bi-directional (32-bit) | max. bandwidth uni-directional (16-bit) | max. bandwidth uni-directional (32-bit) |
|---|---|---|---|---|---|
| 1.0 | 2001 | 800 MHz | 12.8 GB/s | 3.2 GB/s | 6.4 GB/s |
| 2.0 | 2004 | 1.4 GHz | 22.4 GB/s | 5.6 GB/s | 11.2 GB/s |
| 3.1 | 2008 | 3.2 GHz | 51.2 GB/s | 12.8 GB/s | 25.6 GB/s |
HyperTransport comes in four versions 1.x, 2.0, 3.0, and 3.1 , which run from 200 MHz to 3.2 GHz. It has maximum data rate of 6400 MT/s when running at 3.2 GHz. Theoretical transfer rate is (3.2 GHz × 2 bits/Hz × 32 bits/link ÷ 8 (bits per Byte)) in one direction - 51.2 GB/s total throughput. HyperTransport is packet-based, each packet consists of a set of 32-bit words, regardless of the physical width of the link.
AMD uses HyperTransport to replace the Front-Side Bus in many of their processor families. HyperTransport is capable of 32-bit width links, but currently 16 bits links are used by AMD processors. Some chipsets do not even utilize the 16-bit width completely.
No comments:
Post a Comment