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8500 Compatible Processor Cards
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Join Date: Jan 2000
Location: Salt Lake City, Utah
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Oct 27, 2001, 04:48 PM
 
I have a PowerMac 8500/180 w/ a 45 mhz bus, and have been looking around ebay for a quick upgrade to maybe a 250mhz 604e.
I keep reading that I cannot use a processor from a 50mhz bus computer with my 45 mhz bus computer. For example I can't use a 250 mhz 604e card from a 9600 computer or a 233mhz card from a Umax in my computer. Is this true? Of course I keep seeing other auctions that say I can use any processor from 7200-9600 on my 8500.
So what is true?
Any help would be appreciated.

-Lucas
     
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Join Date: Oct 1999
Location: near Boulder, Colorado
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Oct 27, 2001, 05:53 PM
 
My old 8500/120 is at work now. So I don't have to work on a PC.

It is on its third processor, an OEM G3-400 ZIF on an XLR8 carrier.
The bus speed is at 56.8 MHz, processor/L2 @ 454/227.
I found cheap RAM at Velocity Upgrades and it now has 704 MB interleaved 60ns EDO.
It's pretty darned fast for a 6 year old computer, still faster than last year's Dell POS I have.

What you can't use are Mach5 cards from 86/9600's in excess of 233 MHz because they have a different memory bus architecture. They ran a 50 MHz system bus with a 100MHz RAM bus.
     
Kilik  (op)
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Oct 28, 2001, 02:49 AM
 
Thanks!
Do you have any idea if this card is compatible with my 8500?

Umax 233 card

[ 10-28-2001: Message edited by: Kilik ]
     
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Join Date: Oct 1999
Location: near Boulder, Colorado
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Oct 28, 2001, 10:16 AM
 
Should be OK. Looks like the one I had in the 8500 before I put the G3 in. You won't see much of a speed jump tho. I have that card running in a 7500 w/160 MB of bastard RAM and it does a SETI unit in about 40 hours, the 8500 w/ a 454 G3 takes 15-17 hrs...
Best bet is to get a G3 in there.
If you get an XLR8 carrier, you have very fine control of the system bus speed to get the most out of the chip.
You should be able to get a G3 going in there for 100-150 I'd think. http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1289367913 http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1290374259 http://cgi.ebay.com/aw-cgi/eBayISAPI...tem=1289792356
     
Junior Member
Join Date: Jul 2000
Location: usa
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Oct 29, 2001, 11:31 PM
 
Originally posted by Kilik:
<STRONG>I have a PowerMac 8500/180 w/ a 45 mhz bus, and have been looking around ebay for a quick upgrade to maybe a 250mhz 604e.
I keep reading that I cannot use a processor from a 50mhz bus computer with my 45 mhz bus computer. For example I can't use a 250 mhz 604e card from a 9600 computer or a 233mhz card from a Umax in my computer. Is this true? Of course I keep seeing other auctions that say I can use any processor from 7200-9600 on my 8500.
So what is true?
Any help would be appreciated.

-Lucas</STRONG>
If you are going to upgrade, go for either a G3 or G4 upgrade. I have a 7500, running a PowerLogix G4 card. It works terrific (so far). Check out xlr8yourmac.com and lowendmac.com for suggestions on upgrading your machine. Those sites have very insightful, if a bit dated (at least for my 7500) information.
     
   
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