[G4] G5 report

[sr ferenczy]

the performance difference has much much less to do with 64 bit 
optimizations and much more to do with G4 v. G5 processor optimizations 
(including the differences in Altivec, excuse me, Velocity Engine 
between the G4+ and the G5) much of the G4 specific code actually slows 
down performance on the G5s very greatly, as there are G4 specific 
routines that run dog slow on a G5. also, because of things like 
increased number of pipelines, etc, much code will need to be adapted 
for the G5 in order to see highest performance.

in regards to 64-bit-ness, add to this the fact that the G5 will allow 
you to place an ENTIRE 2.75 GB DV clip into ram (ram disk??) and you 
can see much opportunity to create much higher performance on the G5s.

(slightly related- the G5 probably will perform  clock for clock with 
the G4s (ie a 1.8 gHz G5 will equal the performance of a 1.8 gHz G4) 
when bus speeds are not the limitation. that being said, a 900 mhz 
system bus on a 1.8 ghz G5 will allow the G5 to cruise in comparison to 
a G4 on a 167 mhz bus.... thus we come to the biggest problem-moto cant 
create a chip that can fully support DDR (the bus speeds in the G4s 
have been the bottle-neck since, oh, the dual 450s??) so IBM stepped up 
to the plate with an equivalent chip to the G4, but one 100x better 
able to handle the needed bus speeds for today's high powered 
applications.

sandor

On Thursday, September 11, 2003, at 12:33  PM, M Hood wrote:

> but wow...i would have thought there to be a greater difference.
>
> mark
>
>
> ----- Original Message -----
> From: "Doug LaBore" <dlabore at mn.rr.com>
> To: "Power Macintosh G4 List" <G4 at lists.themacintoshguy.com>
> Sent: Thursday, September 11, 2003 11:24 AM
> Subject: [G4] G5 report
>
>>
>> 16:30 minute movie @ 2.75 Gig
>>
>> iMovie rendered to quicktime full DVD quality in 10:30 minutes on my 
>> dual
> G4
>> iMovie rendered to quicktime full DVD quality in 6:05 minutes on the 
>> 1.8
> G5
>>
>> Remembering that iMovie is NOT optimized for 64 bit operations these
> numbers
>
>
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