HP Z440, Z640, and Z840 Workstation Series - Maintenance and Service Guide

D Statement of Volatility
Z440 Workstation
HP conrms that Intel-based Z440 personal workstation contains DDR RAM volatile memory (memory
amount depends on the customer conguration). In addition, the motherboard in the condition originally
shipped without subsequent
modication or the addition or installation of any applications, features, or
functionality, contain the following nonvolatile memory: PCH Real Time Clock (RTC) battery backed-up
conguration memory (256 Bytes), Super I/O battery backed-up conguration memory (16 Bytes), masked
keyboard ROM (2K Bytes), DIMM Serial Presence Detect (SPD) conguration data (256 Bytes per module, 128
Bytes programmable), TPM module (2.35 kB), and Serial Flash IC for System BIOS (128M Bits).
The volatile memory is cleared by removing power from the system for greater than 30 seconds. The
nonvolatile memory on the motherboard is restored by following the steps below:
1. If TPM Ownership has been taken enter F10 setup.
2. Navigate to the Security tab.
3. Select TPM Embedded Security > TPM Clear > Clear.
4. Save and exit BIOS.
5. Press F1 when prompted to accept the clearing of the TPM nonvolatile memory.
6. Download the latest BIOS for this system and operating system o of the HP website.
7. Follow the instructions on the website to ash the BIOS. This will clear all settings and passwords
related to the BIOS.
8. Power down the system and remove the AC power cord. The RTC and Super I/O battery backed-up
memory is cleared by removing the battery found on the motherboard, allowing the board to sit for
greater than 60 seconds, and then replacing the battery.
The DIMM SPD EEPROM is not readily available to the user, however there appear to be tools publicly available
to read and write this part. To eliminate the possibility that it could contain sensitive information, remove the
DIMMs or use one of these tools.
Z640 Workstation
HP conrms that Intel-based Z640 personal workstation contains DDR RAM volatile memory (memory
amount depends on the customer conguration). In addition, the motherboard in the condition originally
shipped without subsequent modication or the addition or installation of any applications, features, or
functionality, contain the following nonvolatile memory: PCH Real Time Clock (RTC) battery backed-up
conguration memory (256 Bytes), Super I/O battery backed-up conguration memory (16 Bytes), masked
keyboard ROM (2K Bytes), DIMM Serial Presence Detect (SPD) conguration data (256 Bytes per module, 128
Bytes programmable), TPM module (2.35 kB), and Serial Flash IC for System BIOS (128M Bits).
The volatile memory is cleared by removing power from the system for greater than 30 seconds. The
nonvolatile memory on the motherboard is restored by following the steps below:
1. If TPM Ownership has been taken enter F10 setup.
2. Navigate to the Security tab.
3. Select TPM Embedded Security > TPM Clear > Clear.
Z440 Workstation 121