Date: Fri, 10 Dec 2004 22:21:47 -0700 From: Andrew Kershaw <[EMAIL PROTECTED]>
On 11 Dec 2004, at 04:18, Pat wrote:
Yeah but the multiplyers on modern G3's and G4's is higher than that, sonnet do a G4 800Mhz and you could use a carrier card with powerlogix's G3 1.1Ghz and get around 1 Ghz or 900something i think.
The G3 1.1 GHz is only compatible with All Power Mac G3 minitowers and desktops, G3 "All-in-One", Blue and White G3's and the PowerMac G4 "PCI Graphics" (aka "Yikes" motherboard G4.) That's mean that it cannot be used with an OldWorldMac.
Thats true because its a ZIF processor, but if you use a carrier card such as those available from daystar technologies, it can be used in an oldworld machine.
Wow, lots of top quoting on this list...
Yeah, I generally just ignore top quoted posts...
The high speed ZIFs might be useable on older carriers, but they will top out at 500MHz. Daystar's ZIF carriers are no exception: <http://www.xlr8.com/Apple_Mac_Products/XLR8_Macintosh_Products/Mac_CPU_G4_Upgrade_PCI_PS.html>
I do not believe this is the case. IIRC, the jumpers for adjusting CPU multiplier are on the PowerLogix ZIF card, so you can set the multiplier there. The jumper/switch on the carrier card will be ignored.
Even if one must use the settings on the Carrier, it should still be possible to get the higher settings. However, one will find that the settings documented for the Carrier are not what one gets with the PowerLogix ZIF.
Basically, the Carrier card is setting jumpers that were passed through (electrically) by the pins of the ZIF card. A ZIF card with higher multipliers will have different multiplier factors associated with the old switch settings on the Carrier card.
But it's not all that it's made out to be. Yeah, you're CPU is fast, but the system bus is still only 50MHz (at most).
Yeah, for CPU bound operations, having a 1 GHz or 800 MHz CPU is nice. But if your computer is doing something which requires it to access RAM a lot, that 50 MHz motherboard bus is going to make itself felt as lower performance.
The on-board L2 cache helps a lot on the PPC750 and PPC7450 but it can only do so much.
Jeff Walther
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