AW: Experiences with Intel 820 Dual-Core....

Blue_Mambo info at
Tue Aug 2 13:09:56 GMT 2005

Only the new Intel Pentium Extreme Edition with dual-core supports HT... the
normal one does not support HT

-----Ursprüngliche Nachricht-----
Von: owner-freebsd-smp at [mailto:owner-freebsd-smp at] Im
Auftrag von B Thomas
Gesendet: Dienstag, 2. August 2005 14:37
An: freebsd-smp at
Betreff: Re: Experiences with Intel 820 Dual-Core....

The Pentium D 820 is not HT enabled. You get 2 cores, but they do not
support multiple hyperthreads per core.  I'm typing this on a new D
820 system, and there are 2 cores, but that's it.  See for more

As for overall performance, it's a bit of apples to oranges.  My other
system (hyperthreaded) had a faster clock speed, but the 820 has a
larger cache and somewhat faster data paths.  Overall, the dual core
feels faster, but it may be the overall system and not the processor.


> Message: 2
> Date: Mon, 1 Aug 2005 21:57:43 -0400
> From: Indigo 23 <indigo23 at>
> Subject: Re: Experiences with Intel 820 Dual-Core....
> To: freebsd-smp at
> Message-ID: <6f50eac405080118571e8e817b at>
> Content-Type: text/plain; charset=ISO-8859-1
> Well more specifically, I was just wondering if it is a wise idea to turn
> HyperThreading (i.e. will I see any benefit performance wise)?
> PS. I know about the security issue regarding HT already.
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