[mythtv-users] Question about nforce2 MB

[Jarod C. Wilson]

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On Wednesday 28 January 2004 14:18, Tommy Nijem wrote:
> Jarod, I figured it was simpler to explain the reason to him using the
> 1800/2400 numbers instead of potentially confusing him even more by
> using the actual clock frequencies of the AMD CPU's.
> But since you brought it up:
> The actual clock speed of an 1800 is 1.53GHz and the 2400 is 2.0 GHz
>
> If you multiply 1.53 times 1.33 you get 2.0349 which is pretty darn
> close to 2.0 GHz
>
> Either way the math works the same.

I just wanted to clarify. Yes, the math does work fine in this situation, but 
doesn't necessarily work out right with others, because MHz to XP mappings 
are non-linear. For example, a Barton core XP 2500 is only 1.83GHz, compared 
to the T'bred XP 2400 in question, which runs at 2.0GHz.


> -----Original Message-----
> From: mythtv-users-bounces at mythtv.org
> [mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Jarod C. Wilson
> Sent: Wednesday, January 28, 2004 4:40 PM
> To: Discussion about mythtv
> Subject: Re: [mythtv-users] Question about nforce2 MB
>
> On Wednesday 28 January 2004 11:17, Tommy Nijem wrote:
> > If you multiply 1800 x 1.33 (100 vs 133 FSB) you get 2394(nearly 2400)
>
> This isn't quite correct. An Athlon XP 1800 does NOT run at 1800MHz, and
> a
> 2400 does NOT run at 2400MHz. To make it more interesting, with the
> multiple
> different Athlon cores in the 2200 to 2700 range or thereabouts, there
> are
> processors with the same tag that actually run at different clock
> speeds.
> Then mix in processors w/166MHz bus speeds... The "multiply by 1.33"
> logic
> doesn't quite hold.
>
> That said, it is likely the bus speed setting causing the problem.

- -- 
Jarod C. Wilson, RHCE

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