I've got a Sun Blade 1500 with 8 GB of memory (4 X 2 GB modules).
I believe that these modules are dual-bank. Interestingly,
prtdiag shows:

============================ Memory Configuration ============================
Segment Table:
-----------------------------------------------------------------------
Base Address Size Interleave Factor Contains
-----------------------------------------------------------------------
0x0 8GB 16 BankIDs 0,1,2,3,4,5,6,7,8,9,10,
11,12,13,14,15

Bank Table:
-----------------------------------------------------------
Physical Location
ID ControllerID GroupID Size Interleave Way
-----------------------------------------------------------
0 0 0 512MB 0,1,2,3,4,5,6,7,8,9,10,11,12,13
,14,15
1 0 0 512MB
2 0 1 512MB
3 0 1 512MB
4 0 0 512MB
5 0 0 512MB
6 0 1 512MB
7 0 1 512MB
8 0 1 512MB
9 0 1 512MB
10 0 0 512MB
11 0 0 512MB
12 0 1 512MB
13 0 1 512MB
14 0 0 512MB
15 0 0 512MB

Memory Module Groups:
--------------------------------------------------
ControllerID GroupID Size Labels
--------------------------------------------------
0 0 4GB DIMM0,DIMM1
0 1 4GB DIMM2,DIMM3


This makes it look like the memory modules are quad-bank.
--
Jeff Wieland

Not sure if there is a question in there, but the bus is 2 DIMMs wide,
so DIMMs are installed in pairs. What you are refering to as dual bank
are also referred to as dual rank.

Each DIMM (in the pair) has 2 ranks of 1GB controlled by a chip select,
each pair has 2 ranks of 2GB, so 2 pair will have 4 ranks of 2GB each.
The DDR SDRAM has 4 internal banks controlled by a bank address.
Interleaving 4 ranks of 4 banks each gives a 16 way interleave.


Jeff Wieland wrote:
> I've got a Sun Blade 1500 with 8 GB of memory (4 X 2 GB modules).
> I believe that these modules are dual-bank. Interestingly,
> prtdiag shows:
>
> ============================ Memory Configuration ============================
> Segment Table:
> -----------------------------------------------------------------------
> Base Address Size Interleave Factor Contains
> -----------------------------------------------------------------------
> 0x0 8GB 16 BankIDs 0,1,2,3,4,5,6,7,8,9,10,
> 11,12,13,14,15
>
> Bank Table:
> -----------------------------------------------------------
> Physical Location
> ID ControllerID GroupID Size Interleave Way
> -----------------------------------------------------------
> 0 0 0 512MB 0,1,2,3,4,5,6,7,8,9,10,11,12,13
> ,14,15
> 1 0 0 512MB
> 2 0 1 512MB
> 3 0 1 512MB
> 4 0 0 512MB
> 5 0 0 512MB
> 6 0 1 512MB
> 7 0 1 512MB
> 8 0 1 512MB
> 9 0 1 512MB
> 10 0 0 512MB
> 11 0 0 512MB
> 12 0 1 512MB
> 13 0 1 512MB
> 14 0 0 512MB
> 15 0 0 512MB
>
> Memory Module Groups:
> --------------------------------------------------
> ControllerID GroupID Size Labels
> --------------------------------------------------
> 0 0 4GB DIMM0,DIMM1
> 0 1 4GB DIMM2,DIMM3
>
>
> This makes it look like the memory modules are quad-bank.
> --
> Jeff Wieland