what is the max ram for an amiga 3000

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"....however, someone cranked up a machine with 128Mb on the accelerator, and three DKB3128s. if i recall correctly the machine only recognised 384Mb due to a bug in exec..."
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That dude is me and the machine is an A4000T.
What I found is that you can't have the DKBs in adjoining slots and you can't have the third one fully populated. I tried many combinations.
The maximum I got was 512mb fast RAM in the end:

http://www.amiga.org/gallery/index.php?n=2741

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Yep, I am sure that not many fools tried 3 DKBs in one Miggy!

I haven't tracked down what the cause is. All I can say is it isn't the boards or the SIMMS. I can rotate them and get the same result. Unfortunately I don't have another big box Amiga to test these DKBs with.