[RC5] Power PC G4 vs. G5

Ben Payne bpayne at jetheaddev.com
Mon Aug 1 21:08:09 EDT 2005


I've been looking at this for a few weeks and it looks to me that the mac mini has the best price to keys per sec of any system out there, by far.   At 30,000 keys per second per dollar.   

-> Ben

-----Original Message-----
From: bert [mailto:bertodell at charter.net] 
Sent: Monday, August 01, 2005 4:39 PM
To: D.net Discussion
Subject: Re: [RC5] Power PC G4 vs. G5

So you're saying that in order to crack RC5-72 blocks it would be better 
to ignore a G5 machine and go with a G4 machine?

Bert

Décio Luiz Gazzoni Filho wrote:

>
> On Aug 1, 2005, at 8:07 PM, Ben Payne wrote:
>
>> I have been very surprised by the relative performance of the G4  and 
>> the G5 processors.  I'm hoping that some people here can  confirm my 
>> finding and/or possibly explain why this would be  occurring.  I have 
>> noticed that the 7450 core is the fastest for  both the G4 and G5 
>> processors.  I have also noticed that there is a  970 core but it has 
>> been disabled.
>>
>>
>>
>> So here are the numbers I'm getting:
>>
>>
>>
>> I have a dual processor G5 1.8 GHz it does ~18 million keys a sec
>>
>> I have a 1.4 GHz mac mini that does ~15 million keys a sec.
>>
>>
>>
>> That all sound good until you add the fact that the G5 has two  
>> processors and is actually clock-for-clock less than 50% the key  
>> rate of the G4.
>>
>>
>>
>> G5: 18 / 1.8 / 2 = 5 million keys per sec per GHz per CPU
>>
>> G4: 15 / 1.4 = 10.7 million keys per sec per GHz per CPU
>
> Have you considered the possibility that the G5 Altivec unit is  
> crippled and can't hope to reach the same throughput as the 74xx's  
> Altivec unit?
>
> As far as I know, what you're seeing is perfectly normal.
>
> Décio
>
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