Acer AB460 F1 - Manual (Page 232)

3 Server Blades: Setup and Installation 212
Supported Memory Population
The node has eight DIMM slots. Each CPU controls four DIMM slots.
The DIMM slots support three channel DDR3-1333 registered/
unbuffered ECC memory modules. The farthest socket to CPU is socket
A (in blue color), while the nearest one is socket B (in black color). For
all memory modes, the socket A in each channel should be populated
first. If socket A is empty, socket B can't be used.
For the system to function, DIMM modules must be installed following
the slot sequence listed below. DIMM module of the same type, size
and manufacturer must be installed in the same colored DIMM slots.