Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

gogul1

macrumors member
Original poster
Apr 26, 2014
65
0
hello, bought 8gb of 800 mhz ddr2 ram for the mac pro to install. I placed all 4 of the big ram (2gb in the top tray) I put the 2 1gb ram modules in the bottom tray as that was the recommended set up. Sadly my mac shows only 6 gb of ram are being recognised. Any ideas?

----------

it recognises the two 1gb modules in the bottom tray (b) DIMM 1 & 2
It recognised the two 2GB modules in top tray (a) DIMM 1 & 2
It says that DIMM 3& 4 in the top (a) tray are not installed... but they are!

----------

ok I put the 2 2gb ram that was in DIMM 3 & 4 in the A tray into the DIMM 1&2 in the B tray. I them put the 1gb modules into the DIMM 3&4 in the bottom (b) tray. It now recognises all the ram.

Can anyone confirm this is the optimal way to use the ram?
 

G4DP

macrumors 65816
Mar 28, 2007
1,451
3
Should tell you in the owners manual.

But I have

Riser A Slot 1 - 2GB
Riser A Slot 2 - 2GB
Riser A Slot 3 - 1GB
Riser A Slot 4 - 1GB

Riser B Slot 1 - 2GB
Riser B Slot 2 - 2GB
Riser B Slot 3 - Empty
Riser B Slot 4 - Empty

All 10GB shows up although I have had to swap the risers around. For some reason one of them will no longer work in the upper riser slot.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.