Mac Pro Memory/Riser problems ; Comments please?


hey guys!

woke morning , booted (08)mac pro find 4gb of ram being booted on riser b, , riser didn't register other 6gb.

started troubleshoot problem testing see if ram had problem, or riser card itself.

config; riser - dimm 1 (2gb), dimm 2 (2gb), dimm 3 (1gb), dimm 4 (1gb)
riser b - dimm 1 (2gb), dimm 2 (2gb), other 2 dimms empty

troubleshooting on riser a

started switching out 2 1gbs, booted, system showed riser dimms 1 & 2, registered, 1gb each instead of 2gb.

proceeded switch 2 1gbs riser dimm 1 & 2, , 2gbs in riser 3 & 4. didn't register of mem modules.

took 2 x 2gbs riser b , replaced riser a's 2gb modules, switched riser cards themselves. viola! 10gb showed up.

throughout whole process, noticed when memory modules don't read, there red led on mem module lights up. i'm wondering problem plaguing memory cards? might add additional ram time , don't want these problems happen again.

it's strange @ times too, whenever kernel panic, , reboot, instead of 10gb, 8gbs show up, , when reboot again, 10gbs show up.

memory problem starting concern me.

conclusion able draw is, perhaps 1 of riser cards spoilt, , should send repair? using 3rd party ram, if send riser cards, void warranty apple, yea?

in advance!!

cheers!
jimmy
 

you run hardware test system disk.

have trouble shoot till figure out problem is. sounds 1 of 2gb dimms or both may bad me, idk sure of course.
 


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