Questions about iBook and iMac rev a-c ram

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martakz's picture
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Questions about iBook and iMac rev a-c ram

Hi All,

Can anyone tell me if the standard SDRAM in the iMac and iBook has any of these features:

EDO
60ns or better speed
4K refresh
self-refresh capability

I look forward to your replies.

Cheers

T

Dr. Webster's picture
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The RAM that those machines u

The RAM that those machines use is plain PC-66/PC-100 SDRAM. The nitty-gritty of the specs (CAS, EEC, etc.) varies from DIMM to DIMM.

martakz's picture
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Is sdram made up of loats of

Is sdram made up of loats of Dram chips?

doug-doug the mighty's picture
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interchangeable?

If you are getting at the question of interchangeability, I can say from experience with my 1st gen iBook and 1st gen iMac, everything works well when you swap RAM from machine to machine. I am sure someone out there has had a bad experience and thinks this is horrible to do, but the old 64Mb chip in my iMac worked for about a year in my iBook until I went up to a 256M chip in the iBook.

It worked for me.

--DDTM

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Actaully, I noticed the old r

Actaully, I noticed the old ram was made up of 8mb chips... I wanted to know if I could desolder one and stick it in my palm V. Compatible chips have to have the pointers I wrote at the top.

I was not sure if sdram is made from dram...

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Chip Differences

martakz wrote:
Actaully, I noticed the old ram was made up of 8mb chips... I wanted to know if I could desolder one and stick it in my palm V. Compatible chips have to have the pointers I wrote at the top.

I was not sure if sdram is made from dram...

The chips which make up EDO and SDRAM dimms are different, in terms of how they interact with the clock and refresh signals.

Here's a technote:

http://download.micron.com/pdf/technotes/ZT07.pdf

Note that the "S" in "SDRAM" stands for "Synchronous", not "Static". (Like "SRAM".)

You might find a suitable chip on a DIMM ment for an older Mac/clone, although I'd check the voltage. (7500-9600 Mac DIMMs are 5v, "Tanzania" systems use 3.3v)

--Peace

martakz's picture
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Yup it needs to be 3.3V. I'l

Yup it needs to be 3.3V. I'll check the Tanzania ram...though I have never heard of it!

Thanks for the help Smile

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Re: Yup it needs to be 3.3V. I'l

martakz wrote:
I'll check the Tanzania ram...though I have never heard of it!

"Tanzania" is the codename for the PowerMac/Performa 4400 (or the 7220 if you are in AU) ...

TOM

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