HyperTransport on EATX Motherboards
The HyperTransport eXpansion [HTX interface] is a dedicated expansion slot used on AMD Mother Boards.
HyperTransport eXpansion provides the daughter card with a direct connection to the Motherboards HyperTransport bus, and processor.
HTX was released in 2005, Note that the current version of this standard is called HTX3, which is the same standard with better speed.
The HTX specification places the HyperTransport Interface on a peripheral slot-based card using the same board size as a PCI card.
The current clock speed of an HTX interface [HTX3] runs at 2.6GHz, at a bandwidth of 20.8 GB/s [with 2 unidirectional 16-bit double data rate [DDR] HyperTransport links].
HTX motherboards used the same mechanical connector as PCIe [1x and 16x], although it's rotated. HTX peripheral cards are meant for Servers and Blades.
Also refer to EATX mother board manufacturers.
Extended ATX [EATX] motherboards are used in servers.
Pin | Side A Connector | Side B Connector |
# | name | name |
1 | RSVD | GND |
2 | VLDT | GND |
3 | GND | CADIN8H |
4 | GND | CADIN8L |
5 | CADIN0H | GND |
6 | CADIN0L | GND |
7 | GND | CADIN9H |
8 | GND | CADIN9L |
9 | CADIN1H | GND |
10 | CADIN1L | GND |
11 | GND | RSVD |
12 | RSVD | GND |
13 | GND | CADIN10H |
14 | GND | CADIN10L |
15 | CADIN2H | GND |
16 | CADIN2L | GND |
17 | GND | CADIN11H |
18 | GND | CADIN11L |
19 | CADIN3H | GND |
20 | CADIN3L | GND |
21 | GND | CLKIN1H |
22 | GND | CLKIN1L |
23 | CLKIN3H | GND |
24 | CLKIN3L | GND |
25 | GND | CADIN12H |
26 | GND | CADIN12L |
27 | CADIN4H | GND |
28 | CADIN4L | GND |
29 | GND | CADIN13H |
30 | GND | CADIN13L |
All the data and clock signals a differential pairs, and each signal has an associated ground line.
Server boards with HTX interfaces
NetLogic Microsystems {HTX Server boards, Dual AMD Processors}
Supermicro, Inc. {HTX Server boards, Dual/Quad AMD Processors}
HTX Connector and Form Factor Specification for HyperTransport Daughtercards and EATX Motherboards;
HyperTransport Consortium [www.hypertransport.org]
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