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PostPosted: Tue Jan 18, 2005 4:40 am 
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Joined: Tue Dec 14, 2004 3:52 am
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Location: Italy - from Mexico
:arrow: From the freescale website: (link)
Quote:
MPC8641D Dual Core Processor
Freescale has leveraged its expertise in building high-performance PowerPCâ„¢ processors and highly integrated communications processors to design the MPC8641D Dual Core Processor. This processor integrates two e600 PowerPC cores, two memory controllers, Ethernet controllers, a RapidIOâ„¢ fabric interface, a PCI Express I/O interface, and a high performance MPX bus that scales to 667 MHz. It's one powerful processor, but it doesn't break the power budget starting at 15 Watts.


The MPC8641D supports flexible software implementations: symmetric multiprocessing (SMP) and Asymmetric multiprocessing. With SMP, one operating system runs on both cores, but from a programming perspective, it appears that the developer is writing a program for a single core. With Asymmetric multiprocessing, two instances of the same operating system or two entirely separate operating systems can be run on the two cores, largely unaware of each other.
@bbrv:

This processor is AWESOME! You should seriously consider using it in your next Pegasos board: ddr2 controllers (on the processor!) and PCI-Express I/O interface and 50% MIPS/Mhz increase! Without breaking 15W!

The 7448 could substitute the G3: with its ~10W at 1.4Ghz it could easily run without dissipator at slightly lower frequencies...

And read about asymmetric multiprocessoring... Two OSs running at the same time! :shock:


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PostPosted: Tue Jan 18, 2005 8:23 pm 
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>and 50% MIPS/Mhz increase!

No increase

>Without breaking 15W!

Afaik the "power budget" is 15-25W (single/dualcore).

>The 7448 could substitute the G3: with its ~10W at 1.4Ghz it could easily run without dissipator at slightly lower frequencies...

According to information from SNDF Japan, it could be as low as 8W.
I created a table over at PPCNUX with an overview of current (7447A) G4 power needs - you might be surprised about the low Watt ratings already (when choosing the appropriate CPU type).


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PostPosted: Wed Jan 19, 2005 1:32 am 
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Location: Italy - from Mexico
Yeah, I've checked: no increase. But the frequency is much higher...
So you say 7448 is better for Genesi's targets?
And what about the 3Ghz models that Freescale is planning? Are they scheduled to be released soon?


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PostPosted: Wed Jan 19, 2005 3:35 am 
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Posts: 38
An integrated memory controller should give the G4 core ("e600 core") a much needed speed boost when working with big data sets, no doubt about it. The 7448 will not widen the FSB bottleneck much, so there will be some incentive to use the 8641(D). A pair of G4 vector units hooked to DDR2 RAM should pack quite a punch.

The follow-on e700 core is way down the road. I don't expect to even only hear solid information on it for another year.


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PostPosted: Wed Jan 19, 2005 7:27 am 
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Location: Austin, TX
The 8641D and it's single-core variant don't sample for quite some months yet. If you want to wait 2 years for the Pegasos III based on it, you are quite welcome :)

The 7448 however is available quite soon and we can focus our attention on it.


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