Pentium 805D has an interesting surprise

[Jarod Wilson]

On Wednesday 25 April 2007 15:19:48 bmcculley at rcn.com wrote:
> Actually it looks like the newer Xeons (dual and quad cores) don't support
> HT.
>
> I googled and found this comment:
> "Hyperthreading is only on the NetBurst based 50xx Xeons - the Core2 based
> 51xx Xeons do not support hyperthreading"

Hrm. That would indicate that I'm mistaken, and the cpus in my workstation are 
50xx-series, not 51xx. Entirely likely.

> The same is apparently true of the 5300 quad-core Xeon.  So much for my
> hope that the new 3GHz eight-core MacPro would hyperthread to give 16
> virtual CPUs :-(

I can definitely confirm that my core 2 quad system has no HT available to 
turn on in the bios (but does show ht in the cpuflags, which aligns with 
other comments in the thread).

-- 
Jarod Wilson
jarod at wilsonet.com