Amd Hypertransport

[kendellrt]

Can someone please explain to me what the HT Bus on the A64's is, or how it works. I have read, but I'm confused.

[cybergrunt69]

I'm probably not the best person to describe this, but since no one else has, I'll give it a shot. Everyone else, please feel free to stomp all over me.... be gentle

 

The P4's bus goes from the CPU to the memory controller, then to the system memory banks. This bus is capped at ~3.97 GB/Sec each direction, and it can only talk in one direction at a time (at 533MHz after a quad pump).

 

The AMD cpu takes advantage of an integrated memory controller, so that extra bus-stop is removed (no pun intended). This bus moves along at ~3.2GB/Sec in each direction - but this bus can also talk in both directions at one time, so it comes out to a theoritical maximum transfer rate of ~6.4GB/Sec.

 

 

[EDIT]

AMD says they invented this technology (with help from several outsiders), and it's managed by the HyperTransport Consortium (home page), and they have a good FAQ page. Their main claim to fame is the architechture for bus interconnects. Instead of having huge (and old) shared busses like PCI, it's consolidated into a smaller faster bus that combines the formerly separated control, data, and address busses. Because of these changes, it's supposedly up to 80x faster than PCI (32bit at 33MHz = 133MB/Sec) while the raw transfer of HT can be up to 22.4 GB/Sec. Sweet!

Edited August 24, 2004 by cybergrunt69

[d3bruts1d]

http://www.overclockersclub.com/reviews/amd_64_article.php

[cybergrunt69]

http://www.overclockersclub.com/reviews/amd_64_article.php

Uhhhhh, or I could have searched for it....

:hanging head:

 

 

 

Thanks D3