yep my dual 1.8 was extremely picky and had to reset cuda before recognition. (also had to exchange what was first shipped since it was not the correct mem)

On Feb 12, 2011, at 1:55 AM, Kris Tilford wrote:

My G5 which is a dual 2.3 using PC3200 is VERY picky about how the RAM is seated. I reseated my sticks something like 26 times before I got all 8 slots recognized and working simultaneously. Once they all were recognized, I've never had another problem. I think it helps if you press the CUDA button before booting after each time you add or change RAM. I think your 1 GB sticks are probably good. I'd try with ONLY the pair of 1 GB sticks over & over again until they're recognized, and then add back the pair of 512MB that seem to work better.

On Feb 11, 2011, at 11:49 PM, jason wrote:

Hey all.  Today got some additional memory for the above system but
the g5 1.8 ghz tower(pci-x) refuses to recognize them.  I currently
have two 512 sticks that work fine, but the two new 1 gb sticks don't
show.
The packing slip identifies them as "PC3200 1gb DDR SDRAM 400mhz 184
pin memory", and the the stick labels both read "1 gb PC-3200 UDIMM
1RX4".

I did move the sticks in question around to the different matching
slots, but the computer ignores them.
I moved the two 512 sticks around as well, and they were recognized in
each of the slots.

What gives?  I thought I was careful in selecting the right ram.






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