Hallo Arno,
Quote:
>I have ars testbench 2.0 data now for MPC8641D, at 1.8 Ghz.
>On almost everything it is outrunning the dual (not dualcore) 1.8 970.
According to
this paper the 1.8 GHz version was a shaming 70 W monster.
Motorola's original target for a dualcore G4 was the 15-25 W typical power range.
That's why they don't provide a 1.8 GHz version.
The Freescale 86xx seems to be performance wise a very capably CPU. It plays in the same performance league as the 970 or X86-Athlon/Opteron.
- The chip can be clocked with 1.8 Ghz (maybe more?)
- The early versions did consume 70 Watt at 1.8 Ghz
While 70 watt is a lot for embedded usage and too much for Genesi's cool computing ideas -
a power usage of 70 watt is normal for a desktop CPU. Most x86 system consume more.
And maybe Freescale can reach their original very low power consumption goal with the next generation of the CPU.
Quote:
>>The blade has two complete memory busses each with interleaved DIMS. So you need always to have 4 DIMS to be equipped in this board.
>To be precise, it has 128 Bit memory access, so a memory feature consists of (just) two DIMMs.
>>If I understand IBM's test on the JS21 blade correctly, then they have achieved this very good result using a board with two 970FX CPU chips
>970MP (only one core alive)
>>each with its own hypertransport ram bus. So the results of 7GB/sec was for both busses together.
>Yes, only it's not Hypertransport but IBM's Elastic Interfaces with plenty of bandwidth to the
CPC945 northbridge
while Freescale limits throughput by using a single MPX bus for two G4 cores (with a single load/store unit each).
So you could say the IBM solution is RAM bandwidth limited while Freescale has a FSB limitation.
Supposedly the Power.org G5 devmachine can use DDR2-667, up from JS21's DDR2-533.
I think we are saying the same, aren't we?
The 970 is a very powerful CPU.
The 7 GB/sec is a very got result!
this good result was achieved with a system using two 970 CPU chips each with two memory Dimms = Two CPU chips + 4 DIMS total.
From what I can see a single chip DUAL 970 has the same memory through as a single chip 8641D ?
Quote:
>>Sergei's test showed a result 1.5 MB per CPU core with 400 MHz memory.
>And just over 2 GB/s for both cores - they don't scale 100% >for reasons mentioned above.
Sergei's test showed a result of 3 GB/s for both cores!
Please have a look at (page 16) again.
And please mind that the scale in Sergeis test is logarithmic.
I think the 3 GB/sec is not bad - its in the same range as the IBM CPU. The 3 GB/sec was with 400 MHz memory. I assume that if you use 600 Mhz memory the limit for both cores will be close to 4 GB/sec.
Quote:
>According to your site an iBook with 142 MHZ FSB exhibits 958 MB/s already...
The Ibook has nearly 1 Gb/sec with DDR 288 memory.
Yes, and the 86xx seems to be 3 times faster using DDR 400 memory.
I think it will be 4 times faster with DDR 600 memory.
I think the 86xx is a nice improvement over the G4.
Quote:
>>And IBM has the trio of super chips with: Power7
>Isn't Power7 a 2010 GA chip? :-)
Sorry, I meant Power6.
Cheers
Gunnar
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