Reference Guide

Description
Reference
Designator
Volatility Description
User
Accessible
for external
data
Remedial Action (Action
necessary to prevent loss of
data)
RTC CMOS
– BBRAM
(battery
backed up)
JRTC
Non Volatile memory, 64 Bytes.
Stores CMOS information.
No
N/A
Video
memory –
frame buffer
For SG mode
using system
DDR4
For DSC mode
using MXM
VRAM
Volatile memory in off state.
SG mode uses main system
memory size allocated out of
main memory.
Discrete graphic mode:
4 GB GDDR5 for nVidia N17P-
Q1 discrete graphics systems.
4GB GDD5 for nVidia
N17P-Q3
4GB GDD5 for AMD F16M-
S2-50 Baffin Pro WX4150
2GB GDD5 for AMD F16M-
S1-30 Baffin LE WX4130
No
N/A
Hard drive(s)
User replaceable
Non Volatile magnetic media,
various sizes in GB. May also be
SSD (solid state flash drive) and
Hybrid HDD.
Yes
Low level format
PD controller
EEPROM
UT20
(daughter board)
Non Volatile memory, 8 Mbit
(1MB), Power Delivery and type
C operation
No
N/A
Thunderbolt
controller
EEPROM
UT1
(daugher board)
Non Volatile memory, 8 Mbit
(1MB), Thunderbolt/type C
operation
No
N/A
TPM controller
U637
Non Volatile memory, 16K
bytes flash
No
N/A
USH
U1
(daughter board)
Non Volatile memory, 32 Mbit
(4MB), for Control Vault
operation
No
N/A
CAUTION: All other components on the system board lose data if power is removed from the system. Primary power loss
(unplugging the power cord and removing the battery) destroys all user data on the memory (DDR4, 2400 MHz).
Secondary power loss (removing the on-board coin-cell battery) destroys system data on the system configuration and
time-of-day information.
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