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Old Dec 30, 2006, 08:52 AM   #1
TyleRomeo
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Pci Speeds On G4

The 64 bit 33MHZ PCI slots on a G4 are running at 133MBps correct? Also I want to know if all 4 of them are running fully inpendent from each other? So if I have a RAID card in there I can get the full 133MBps and will not be robbed of speed if I have a neighboring Firewire 800 or SATA RAID next to it.
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Old Dec 31, 2006, 06:51 PM   #2
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All 4 slots share the same bus to the system controller. So its a shared bus. They all have their own bus to the main bus that goes to the system controller, but once its on that main bus its all shared. I know it sounds confusing doesn't it.

Here are a couple of links to help you:

http://developer.apple.com/documenta...0304-TPXREF102


http://developer.apple.com/documenta...0306-TPXREF108
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Old Dec 31, 2006, 09:39 PM   #3
TyleRomeo
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Hmm, I took a look at the links, but I'm still a bit confused. Let me see if I get this right. The max burst for each PCI slot is 133MBps. So all 4 of them would give me 533MBps. But all of this just depends on how much else I have going in thru the system controller and that depends on my crappy 167MHZ bus that translates to 1.3GBps transfer speed for all info for my computer. Am I getting close?

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Originally Posted by mklos View Post
All 4 slots share the same bus to the system controller. So its a shared bus. They all have their own bus to the main bus that goes to the system controller, but once its on that main bus its all shared. I know it sounds confusing doesn't it.

Here are a couple of links to help you:

http://developer.apple.com/documenta...0304-TPXREF102


http://developer.apple.com/documenta...0306-TPXREF108
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