G4 Processor Part Numbers

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Level 1

15 points

G4 Processor Part Numbers

I have a G4 processor card with the part number 820-1314-A. When I look it up on the web it comes up with a 733MHz G4 processor. Can the number also be for an 876MHz processor card or is that a different part number?

I went to the Apple web site and did a search in Support>Specifications, but came up up empty. When I did the search using the serial number from the processor card it came back with a result for a first generation iPod.

Can anyone shed some light on how Apple part numbers relate to specific componants?

G4 Mirrored Drive Door, Mac OS X (10.3.x), 867MHz/512MB/90GB/ATI RV280 AGP4x

Posted on Jan 12, 2008 9:23 AM

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Answer 1

Jon Smith

Level 4

1,390 points

Jan 12, 2008 1:27 PM in response to amacmedic

Hello amacmedic,

Some time ago I bought a cpu over eBay - and I can't remember the exact wording - but I think it was advertised as a 733 or 933mhz(QS) with issues - I know it mentioned both ratings. It was sold as is, and cheap, so I gave it a try. Turned out it was dead as a doornail - not unexpectedly - but the part number was 820-1314-A and the sticker on the back side of the chip said KC14337VLRSA SINGAPORE 867 .

I've often wondered exactly what it is (or was) and where it came from - sort of assumed it was one of those cheap Hong Kong "new 933s" that were much in evidence on eBay for a while. Haven't seen one listed recently, though.

Just thought you might like to know, Mr. Holmes.

Regards ..... Dr. Watson

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Answer 2

amacmedic Author

Level 1

15 points

Jan 12, 2008 3:28 PM in response to Jon Smith

Ok. After thinking about my question, I have come to the conclusion that it is rather vague. I' ll try again.

The part number from the processor card that I have tells me that the processor on the card is clocked to 733MHz (via web search). If the processor was clocked to 933MHz (1 of 3 speeds available for this type of processor card), would it have a different part number and would the componants on the card be configured differently?

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Answer 3

Jan 12, 2008 3:49 PM in response to amacmedic

Apple 733MHz quicksilver CPU 661-2505

867MHz quicksilver CPU 661-2506

dual 800MHz quicksilver CPU 661-2507

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Answer 4

Jon Smith

Level 4

1,390 points

Jan 12, 2008 5:57 PM in response to Forrest McElfresh1

Not helpful there, Professor Moriarty, we're talking about the 820 number stamped on the processor card itself, next to the Apple Computer Inc © 2001.

Regards ..... Watson

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Answer 5

Jan 13, 2008 9:28 AM in response to Jon Smith

The 661 numbers are the GSX part numbers from the service source document.

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Answer 6

amacmedic Author

Level 1

15 points

Jan 13, 2008 1:28 PM in response to Forrest McElfresh1

I am really interested in answers from people who can "answer" the question, I'm not looking for any other information. I know that the Apple 820 part numbers are a mystery, so I am hoping that some tech from Apple will stumble across this question.

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Answer 7

Jan 13, 2008 3:04 PM in response to amacmedic

Here's a web page listing the G4 MDD 867MHz processor
http://www.dvwarehouse.com/Processor-Module-867Ghz-Dual-(G4/MDD)-p-33065.html

However, it has a P/N 820-1310-A as the Apple Assembly and P/N 661-2711 as the Apple Model.

 Cheers, Tom 😉

Note: The above link is not clickable. Copy the link & paste it in your browser.

Message was edited by: Texas Mac Man

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Answer 8

amacmedic Author

Level 1

15 points

Jan 13, 2008 4:20 PM in response to Texas Mac Man

Thanks for that, but it really does not answer my question.

I opened up another G4 that I have and took the heat sink off the processor (something I really did not want to do) and the assembly number of the processor card is different (820-1344-A). A search on the net turned up nothing on this number.

Here are some more details and some more questions.

The top of the processor of the 820-1314-A card has this on it:
XPC7450
RX867QE

74K51S
DJC0138

I know that the top number is the chip type (7450).
If the second set of numbers (RX867QE) is suppose to designate the processor speed (867MHz) then why does a net search turn up a 733MHz processor?

The 820-1344-A card has chip type 7455. The second set of numbers are RX933PC, but the processor is clocked at 867MHz (verified in the System Profiler). Does this mean that the second number denotes the maximum processor speed?

Summary of questions: (This is going to be a challenge for you techs out there)
• Do the assembly numbers differ from processor card to processor card with the same chip type (7450), but different speeds (733MHz, 867MHz, 800MHz, 933MHZ)?
• What do the second set of numbers (RX867QE) on the processor mean?
and
• What is the difference between a 7450 and 7455 processor chip?

Wish I could give a prize to the one who can answer these questions. They seem to be stumpers.

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Answer 9

amacmedic Author

Level 1

15 points

Jan 13, 2008 4:23 PM in response to Jon Smith

And the plot thickens Watson...

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Answer 10

Jan 13, 2008 6:54 PM in response to amacmedic

PPC 7455 is a revised and optimized ( particularly cache ) version of the 7450.

The marked speed is the manufacturers certified speed ( the part may well operate faster )

There were two different QS families, the 2001 733. dual 800, and 867. The QS 2002 came in 733 edu, 800, 933 and dual 1000. the two 733 differ in that one has no L3 cache. The dughter card that the processor resides on went though a few revisions which are reflected in differing 820 numbers but not 661 part numbers.

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Answer 11

amacmedic Author

Level 1

15 points

Jan 13, 2008 7:03 PM in response to Forrest McElfresh1

Thank you for your helpful response. Is there a way to find a list of assembly numbers with corresponding processor types and speeds?

(Tally Hoe!, Watson. The game is afoot!)

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Answer 12

Jan 13, 2008 7:19 PM in response to amacmedic

Perhaps I was unclear, the 820 number is the PC board part number. The 661 number is the assembly part number. The 820 number is unlikely to have any bearing on the actual processor or original assembly's ultimate intended speed ( speed is controlled by a resistor network per processor ).

Best one can guess is later revisions had 7455 and/or higher rated processors ( regardless of assy
speed ).

PPC 7400 evolution

7400 ->7410 ->7450 ->7451 ->7455/7445 ->7457/7447 ->7448

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Answer 13

Jon Smith

Level 4

1,390 points

Jan 13, 2008 7:44 PM in response to Forrest McElfresh1

Hello Moriarty,

I think you're right. I just looked at another 867 and the processor card bears the number 820-1282-A. I'm used to the old beige G3s, where there was a little more consistency between stamped card and board numbers and revision numbers.

It would be nice to look at the processor card - or chip - and know the speed, but I guess you can't have everything. Perhaps further investigation...

Regards ..... Watson

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Answer 14

amacmedic Author

Level 1

15 points

Jan 14, 2008 1:55 AM in response to amacmedic

After a long and arduous investigation the brilliant Holmes is once again lead to another seemingly open ended puzzle left by the his arch rivel Prof. Moriarty. While his trusted assistant Watson ferrets out further clues, Holmes retreats to this study to to contemplate his next move to solving "The 820 Apple Part Number" mystery.

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Answer 15

Feb 25, 2008 6:30 PM in response to amacmedic

Hello,

I recently purchased what was suppose to be a Quicksilver G4 867 CPU Daughter Card. When installed and checked under system profiler, it reported the CPU as 867, but no L3 cache. I tried to get the L3 cache to work, but it did not. I happen to have a Quicksilver 867 handy so I checked the CPUs to see what was different.

Correct with L3 cache CPU is marked 820-1282-A.
CPU Daughter card purchased has P/N 820-1344-A and no L3 Cache.

820-1344-A is marked on CPU
XPC7455
RX867PC
91L96C
DTB0220

The 820-1344-A Daughter Card looks identical to the Quicksilver 733 CPU which leads me to believe it is an over clocked CPU. I did not get the Country information off the Daughter Card as my wife needed her computer back.

Message was edited by: VintageRifle

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