Re: FAQ-Zip GS upgrade: The 10MHz alternative

[dempson@actrix.gen.nz (David Empson)]

Terry McDanel <tmcdan19@skypoint.com> wrote:

> Dark_Dude (Dark_Dude@darkcastle.ecore.fnet.org) wrote:
> 
> : How much faster does a 10 Mhz IIgs go than a 9 Mhz?
> 
> 
> : Going from a 66 Mhz PC to a 80 Mhz PC is noticable, but can I compare this
> : to a 9 Mhz GS and a 10 Mhz GS?
> 
> Relative. Going from 9 Mhz to 10 Mhz is about 10% faster.  Going from
> 66 Mhz to 80 Mhz is about 15% faster, if i got the math right.

Maybe in theory, but it is not likely that you would get a 10%
improvement (actually 11.1% if you want to be more accurate).

Since the ZIP uses a caching scheme, you would only get an 11.1% speed
improvement for cycles which access data in the cache.  Every access to
the real memory will run at the same speed.  This includes all writes to
RAM, all I/O accesses, and all reads from locations which are not yet in
the cache.

Code which runs in loops performing calculations would probably be about
10% faster.  In general, I'd expect more like a 5% increase in speed.


-- 
David Empson
dempson@actrix.gen.nz
Snail Mail: P.O. Box 27-103, Wellington, New Zealand