Mac Pro 1,1 - New 4GB dimms registering as 2GB

MacPoulet

macrumors regular
Original poster
Dec 11, 2012
213
18
Canada
Hi all,

I just purchased 8GB (2X4GB) for my 1,1 used on eBay. The problem is, they're only registering as 2GB each.

They're the right type 5300F 667Mhz, and all the labelling says they're 4GB dimms. However, when I put them in my system, the error LED lights up for one of them. I tried moving them around and no matter where it goes, that red LED follows it.

Is one of the sticks faulty? I haven't done the 2,1 firmware upgrade (long story), but would that help? I wanted to troubleshoot before I contact the seller.

Thanks so much!
 

TheEasterBunny

macrumors 6502
Jan 22, 2013
251
0
Delaware
I'm gonna guess that somewhere in that long ID number those sticks have on them, there is a small part that says "4R" iirc. This is four channel RAM. Old Pro's don't do 4 channel RAM.
Try to Google that long ID number and see what comes up for it for specs.
This is just a guess.
 

MacPoulet

macrumors regular
Original poster
Dec 11, 2012
213
18
Canada
Thanks, I'll take a look.

Dang, and I thought I was pretty meticulous about choosing the right kind.
 

MacPoulet

macrumors regular
Original poster
Dec 11, 2012
213
18
Canada
I'm gonna guess that somewhere in that long ID number those sticks have on them, there is a small part that says "4R" iirc. This is four channel RAM. Old Pro's don't do 4 channel RAM.
Try to Google that long ID number and see what comes up for it for specs.
This is just a guess.
The eBay seller listed it as dual channel. I think one of the modules is bad.
 

666sheep

macrumors 68040
Dec 7, 2009
3,623
212
Poland
I'm gonna guess that somewhere in that long ID number those sticks have on them, there is a small part that says "4R" iirc. This is four channel RAM. Old Pro's don't do 4 channel RAM.
Try to Google that long ID number and see what comes up for it for specs.
This is just a guess.
You're confusing channels with ranks.

I think one of the modules is bad.
If red LED "follows" the DIMM - yes, it is bad.
 

MacPoulet

macrumors regular
Original poster
Dec 11, 2012
213
18
Canada
You're confusing channels with ranks.



If red LED "follows" the DIMM - yes, it is bad.
Yep, the red LED does follow the DIMM, I was able to confirm that today. Contacted the seller and will see what happens. Thanks 666sheep.

TheEasterBunny: I agree, I think it was a good guess. So good in fact, that's what I'd written in my first post. ;)