[WelMac] Fwd: [wlug_trade] High end bits for sale

[David Empson]

At 6:20 PM +1200 21/9/2006, Jo Booth wrote:
>The Ram would probably work inna G4 Mac, anyone?
>
>Begin forwarded message:
>
>>  From: "Geraint M. Jones" <G.Jones at french-maid.co.nz>
>>  Date: 19 September 2006 10:17:06.0
>>  To: wlug_trade at list.afraid.org
>>  Subject: [wlug_trade] High end bits for sale
>>
>>  2 x Seagate Cheetah 10,000 RPM Ultra 320 SCSI Drives - 36.4gb
>>
>>  3 x 1gb PC2100 DDR CL2.5 ECC RAM

Nope, you can't use ECC RAM in most Macs. The only ones I can find in 
MacTracker are the Mac Pro, last model PowerMac G5, Xserve G5 and 
Xserve Intel.

For an iMac G4, you need PC133, PC2100 or PC2700, depending on the 
generation. The user-accessible RAM slot in an iMac G4 is a SO-DIMM. 
There is also a factory installed full size DIMM, but I've never 
pulled an iMac G4 apart to get to it: it is likely to require an 
unusual degree of complex operations including reapplication of 
thermal paste.

For a PowerMac G4, you need PC100, PC133, PC2100 or PC2700, depending 
on the generation (Mirrored Drive Doors is PC2100 or PC2700), using 
full size DIMMs.

Models which support DDR RAM (PC2100 or PC2700) should be OK with 
higher speed DDR RAM (e.g. PC3200) but I haven't confirmed this for 
myself. They don't work with DDR2 RAM (e.g. PC2-4200).

For all G4 models, the RAM must be non-registered non-parity non-ECC, 
must implement the serial presence detect EEPROM correctly, and 
support the timing modes used by the Mac (details are hard to find). 
This might depend on the mixture of RAM in the computer, e.g. if you 
have any CL3 RAM, then CL2 RAM will operate slower than normal, but 
if its SPD EEPROM isn't programmed to specify the timing when used in 
CL3 mode then it might not work.

-- 
David Empson
dempson at actrix.gen.nz
Snail mail: P.O. Box 27-103, Wellington, New Zealand