Is Mac memory (RAM) inherently different than PC memory?
I’ve acquired 4x512mb sticks of PC2700 333mhz unbuffered, unregistered, non-ECC (including one from Keith, thanks Keith!)…but my G5 1.6 isn’t interested. I’ve checked at Everymac.com and seem to be using the right spec. But if I install any pair (they have to be installed in matching pairs) the power light just blinks slowly and nothing else happens.
Re-installing the old 128mb sticks fires the G5 up straight away.
??
Any clues as to what’s wrong here? The G5 has four slots and according to Everymac and Apple can take upto 4gb RAM.
They really do have to be exactly matching pairs – down to the
manufacturer and everything. If they truly appear to match, then
experiment with different combinations of pairs. You may find that
using two of one will mean you can’t use two of another along with.
This is almost as fussy as the old Mac II fx.
Walter
On Jul 18, 2009, at 12:27 PM, hugh wrote:
But if I install any pair (they have to be installed in matching
pairs) the power light just blinks slowly and nothing else happens.
Well the most recent pair I acquired are 2 x 512mb Infineon with exactly the same code numbers on them, HYS64D64320GU-6-B, 64Mx64, B1832020, PC2700U-25330-80
According to the Infineon spec sheet they are: “The HYS[64/72]D32x00[G/E]U-x-B are industry standard
184-Pin Unbuffered Dual-In-Line Memory Modules (UDIMM) organized as 64M× 64 for non-parity main memory applications”
The only possible thing I can think of is that they are high density?
Otherwise I don’t think I can get much more matching.
Try asking the folks at Ramjet – they have a lot of experience with
this, and may know why they aren’t working. But when this pair doesn’t
work, is it the only memory installed in the machine?
Walter
On Jul 19, 2009, at 7:00 AM, hugh wrote:
The only possible thing I can think of is that they are high density?
Otherwise I don’t think I can get much more matching.
Well I tried all permutations of fitting, one permutation being just the install of these two matching units - ie. only the 2 x 512mb Infineon in the machine, other two slots empty. Still dead.
You might want to take the memory to a shop that has a memory tester. (My local independent Mac shop has one, call around to places that repair computers themselves, you might find one.) Memory is notoriously fragile, physically and electrically, and if yours was removed from a working computer, it might not have survived the handling process.
As far as I know, if the specs of the memory match the requirements of your computer, then it will work, as long as the memory itself works and you have followed the somewhat arbitrary rules about placement in pairs and in certain slots first. There’s nothing unique about Apple-supplied memory, it’s a commodity product they buy from other suppliers.
The one thing I can tell here is that it is the standard RAM and if you’ll ty to make a research on the official website of Apple, you will As long as you have read and understand the Apple RAM specification, anything that matches should work, “Apple” certified RAM is is just guaranteed to work.
If you are planning to purchase 4x4Gig sticks for a Mini, I’d suggest you re-read the spec.
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