[G4] G5 or G4

[Vernon LeMoignan]

64 bit does not double the speed of 32 bit. We are talking about 64 bit 
mathematical computations, not 64 bit
instructions. The G5 will NOT be executing the equivalent of 2 32 bit 
instructions per clock cycle.

Is the G5 faster? yes. But only in certain instances with highly 
optimized code. The 64 bits will allow the G5 to
do high end processes that were restricted to 64 bit workstations. In 
fact, if the code is not optimized latency from the
g5's cache and much longer pipeline can cause bottlenecks in processing.

When NASA tested the G5 in comparison to the G4 they found that Mhz for 
Mhz the processors were very close.

although the 1Ghz system bus is impressive ( not really 1Ghz but 250mhz 
with multiple channels and other magic thrown in) it
won't be like 5 times faster or anything, maybe, maybe twice as fast.


In addition having two dual processor work stations can be more useful 
than having the power of two workstations in one. Just depends on the 
actual environment your working in.

Vern.



On Friday, August 15, 2003, at 11:06  AM, Kunga wrote:

> Let's see. 2 x 1.25 G4 = 2.5 GHz @ 32-bits x 2 units = 5 GHz @ 
> 32-bits.  $3200
>
> 2 x 2 G5 = 4 GHz @ 64-bits = 8 GHz @ 32-bits. $3000
>
> No the math tells me you do not get two dual 1.25 GHz G4s for about 
> the same price as a dual 2 GHz G5. More like one dual 2 GHz G5 is like 
> getting almost 3 G4's for less than the price of two G4's. Moreover, 
> this is only an exercise in comparing processing speeds not taking 
> into account the radically faster bus and all the rest of the G5's 
> much faster components.
>
> kunga10 (AIM)
> kunga47 (Yahoo Messenger with Cross-Platform dial-up Video sans audio 
> on Macs)
>
> On Friday, August 15, 2003, at 06:26  AM, Sean O'Malley wrote:
>
>> I would agree except one small note, you can actually get two G4 
>> duals for about the same price as the dual G5.
>>
>
>
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