167Mhz to 1Ghz!?? I don't get it...

S

senne

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The current PowerMacs have a processor bus speed of 167Mhz maximum. According to the rumors of the new PowerMac G5, it's going to be 1Ghz!!

How can this change so fast? I really don't get it..
 
Originally posted by senne
The current PowerMacs have a processor bus speed of 167Mhz maximum. According to the rumors of the new PowerMac G5, it's going to be 1Ghz!!

How can this change so fast? I really don't get it..
Click to expand...

Nope, and it isn't true either ;)
It's one of the elements which seems fishy about the picture from the store. The system bus of a 2 GHz 970 would be 500 MHz, as the core:system rate is 4:1 on the 970s. FSB would be 1 GHz, but that's something else.
 
Originally posted by senne
hmm, so the rumors aren't true after all! Steve! Release me from this horrible pain!






:)
Click to expand...

Those specs are at least not 100% accurate. Maybe that's why they took them down so quickly :D
 
The FSB is the Systembus.

As I understand it, 1GHz is the rate that the Processors can talk to each other.
 
Originally posted by senne
The current PowerMacs have a processor bus speed of 167Mhz maximum. According to the rumors of the new PowerMac G5, it's going to be 1Ghz!!

How can this change so fast? I really don't get it..
Click to expand...
It could be referring to the Hyper Transport (a.k.a. Hyperthreading) bus speed between a pair of CPUs...
 
Originally posted by ksv
Nope, and it isn't true either ;)
It's one of the elements which seems fishy about the picture from the store. The system bus of a 2 GHz 970 would be 500 MHz, as the core:system rate is 4:1 on the 970s. FSB would be 1 GHz, but that's something else.
Click to expand...

I thought the Bus on the 970 operated at 1/2 core so it would be 1 GHz on a 2GHz processor. Now that said there are lots of different busses that could be called the "system bus" but I always thought that it was the one that directly touched the processor which they meant.

Also I have heard a lot of different things about Hypertransport and I honestly have not had the time to check it out but it sounds like it is a point to point interconnect and not actually a bus. But then again marketers play fast and loose with that sort of thing at times.
 
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