Acer Altos R910 Series - Manual (Page 76)

3 System upgrade 66
Processor core VRMs
Use processor core 10.2 VRMs with processors installed in CPU sockets 3
and 4.
Processor core VRM requirements
This server requires the installation of VRMs when upgrading the CPU
in CPU sockets 3 and 4.
Refer to the configuration label on the inside of the chassis top cover
for the locations of these VRMs. Contact your local Acer representative
for specific VRM requirements. As an overview, the following generic
VRM rules apply:
No. of processors Processor core 10.2 VRM requirement
One None
Two None
Three One core 10.2 VRM
Four Two core 10.2 VRMs
10.2 VRM
for CPU3
10.2 VRM
for CPU4
CPU1
CPU2
CPU4
CPU3