freebsd i386 on amd64 hardware?

Rob rob2 at
Mon Sep 27 08:45:41 PDT 2004

Joseph Fenton wrote:
> Ketrien I. Saihr-Kesenchedra wrote:
>> Bearing in mind that I don't work for AMD, my understanding is that 
>> AMD has always planned on three sockets for the Athlon64 - 754 (single 
>> channel), originally because it can be put on a 5-layer PCB. Socket 
>> 940 for Opterons for dual channel, but requiring a 6-layer PCB. And 
>> Socket 939 because that one less pin allows for 5-layer PCBs and dual 
>> channel.
> The 754 socket (one HT port and single-channel mem) was destined for
> laptops. The 940 (three HT ports and dual-channel mem) needs the extra
> layers for proper operation. The 939 keeps the dual-channel, but replaces
> two of the HT ports with extra power and ground pins. All the extra power
> and ground pins means less current surge and therefore needs fewer layers.
> Making it one pin less keeps you from accidentally sticking it in the wrong
> socket.
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Thanks guys for the clarification.   Rob.

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