I/O Planars (Top View) - IBM 7015-R50 Installation And Service Manual

According to both the size and the number of memory module kits installed on the RLX,
NFX, or SF5 cards, these can be divided into the following models:
NF64 board, based on 4M bit technology, which gives 64MB memory. It houses two
MM32 memory module kits.
NF128 board, based on 4M bit technology, which gives 128MB memory. It houses two
MM64 memory module kits.
NF256 board, based on 16M bit technology, which gives 256MB memory. It houses two
MM128 memory module kits.
NF512 board, based on 16M bit technology, which gives 512MB memory. It houses four
MM128 memory module kits.
NF1024 board, based on 16M bit technology, which gives 1024MB memory. It houses
four MM256 memory module kits.
Note: The maximum memory configuration yields a system with:

I/O Planars (Top View)

Flex Cable
Connector
1/1 1/3
1/2
Adapter Slot Locations
R30 and R40 - 2048MB (4 x 512MB)
R50 - 4096MB (4 x 1024MB).
Power Interface
Connector
1/5 1/7
1/4 1/6 1/8
Flex Cable Power Interface
Connector Connector
0/1 0/3 0/5
0/2 0/4 0/6
Adapter Slot Locations
Reference Information
0/7
0/8
1-11