Along the lines of looking at the PSU, I've also been investigating all the Tezro power rails, many of which are generated not by the power supply but instead by VRs / VRMs on various system boards.
If referencing or duplicating this information, I ask that you maintain a prominent link to this original forum post for further updates, as well as a credit by name.
L1 monitoring shows how just how many rails there are!
Everything that follows is just a best guess, much of it acquired by probing the high amperage rails on a live running Tezro, without covers and sometimes without fans or air guides! Any corrections are welcome, although I think it would probably be a limited set of people with Tezros that would want to do this.
Most anything with 3.3V, 5V, or 12V probably comes straight from the power supply, although some of it is current monitored separately. I didn't find enough VRMs to account for all the separately measured 3.3/5/12 rails. This includes:
The node board has four VRMs, only one of which (VRM #1 / CPU) is removable, and the other three soldered directly to the board via 0.1" pin headers:
These appear to line up to the following rails:
The motherboard has two (non-modular) voltage regulators hidden away underneath the fan wall:
These appear to correspond to the following rails:
The 29302BU linear regulator at the bottom appears to draw off of +5Vsb and supply:
The Vpro card (V12 in this case, not pictured) also carries an internal 2.5V voltage regulator. I am not aware that this on-card rail is separately monitored in the L1 controller's environmental report.
If referencing or duplicating this information, I ask that you maintain a prominent link to this original forum post for further updates, as well as a credit by name.
L1 monitoring shows how just how many rails there are!
Everything that follows is just a best guess, much of it acquired by probing the high amperage rails on a live running Tezro, without covers and sometimes without fans or air guides! Any corrections are welcome, although I think it would probably be a limited set of people with Tezros that would want to do this.
Most anything with 3.3V, 5V, or 12V probably comes straight from the power supply, although some of it is current monitored separately. I didn't find enough VRMs to account for all the separately measured 3.3/5/12 rails. This includes:
- 12V
- 12V #2
- 3.3V
- 12V IO
- 5V AUX (+5Vsb)
- 5V
- XIO 12V BIAS
- XIO 5V
- IP53 5V AUX (+5Vsb)
- IP53 12V
The node board has four VRMs, only one of which (VRM #1 / CPU) is removable, and the other three soldered directly to the board via 0.1" pin headers:
These appear to line up to the following rails:
- IP53 VCPU - "VCPU" VRM #1 (1.25V)
- IP53 1.5V - "VIO" VRM #2
- IP53 SRAM - "VMEM" VRM #3 (2.5V)
- XIO 2.5V - "BEDROCK" VRM #4
The motherboard has two (non-modular) voltage regulators hidden away underneath the fan wall:
These appear to correspond to the following rails:
- 2.5V (or possibly "XIO 2.5V" and vice versa)
- 1.8V
The 29302BU linear regulator at the bottom appears to draw off of +5Vsb and supply:
- 3.3V AUX
- IP53 3.3V AUX
The Vpro card (V12 in this case, not pictured) also carries an internal 2.5V voltage regulator. I am not aware that this on-card rail is separately monitored in the L1 controller's environmental report.
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