HP z420 motherboard 18 pin layout

[Kondensator]

I do not have the original power supply. I soldered the adapter atx 24 pin to 18 pin. But I had a problem, I did not find the pinout of the processor and memory.

[WEISERSTEVE]

The only problem with your explanation of the z420 workstation is that p1 is an 18 pin connector not 20 pin and p2 is an 8 pin connector not 6 pin, and having said that it completely confuses the would be z420 owner and throws all the pin numbers and definitions completely off.

[WEISERSTEVE]

The only problem with your explanation of the z420 workstation is that p1 is an 18 pin connector not 20 pin and p2 is an 8 pin connector not 6 pin, and having said that it completely confuses the would be z420 owner and throws all the pin numbers and definitions completely off.

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@Dan_WGBU wrote:

As an HP Employee, I cannot recommend using any power supply except the HP supply (I keep repeating this because I have to say it).  However, let me give some high-level hints to keep users from preventing any system damage.  Of course I cannnot give any HP proprietary or unique design infomation.

Power supply rails cannot provide more than 240VA per rail, per UL safety regulations.  Many systems need more than 240VA of +12V, so a high wattage power supply will have multiple +12V rails.  These different rails power different parts of the motherboard. 

On the Z420, CPU and memory are powered from the 6-pin P2 connector. 

The 20-pin P1 power connector has 3 +12V rails, as shown in the diagram I posted earlier. 

     +12V_B powers the motherboard +3.3V and 5V regulators, some auxiliary CPU voltages, and some fans. 

     +12V_S powers some chipset regulators, some other peripheral circuits, and PCI slots 3, 4, and 5.

     +12V_D powers Slots 1 and 2.

ATX supplies are specified by total output (Watts), which include all voltages together, including +5V and +3.3V.  Therefore, the most important specification is the amount of +12V provided by the supply.  The Z420 supply does not provide +5V and +3.3V, so it is important that the +12V_B rail has enough power for these onboard regulators otherwise the system may not power up.  If the other +12V rails do not have enough power, and high-powered PCIe cards are installed in some slots, they might not have enough power and the system could crowbar. 

All this means that the Z420 needs several separate high power +12V rails to work correctly. 

HP Workstations are designed as a total system, to optimize performance.  That is why HP does not use ATX power supplies in these high-end and high-power Workstations. 

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@Dan_WGBU wrote:

As an HP Employee, I cannot recommend using any power supply except the HP supply (I keep repeating this because I have to say it).  However, let me give some high-level hints to keep users from preventing any system damage.  Of course I cannnot give any HP proprietary or unique design infomation.

Power supply rails cannot provide more than 240VA per rail, per UL safety regulations.  Many systems need more than 240VA of +12V, so a high wattage power supply will have multiple +12V rails.  These different rails power different parts of the motherboard. 

On the Z420, CPU and memory are powered from the 6-pin P2 connector. 

The 20-pin P1 power connector has 3 +12V rails, as shown in the diagram I posted earlier. 

     +12V_B powers the motherboard +3.3V and 5V regulators, some auxiliary CPU voltages, and some fans. 

     +12V_S powers some chipset regulators, some other peripheral circuits, and PCI slots 3, 4, and 5.

     +12V_D powers Slots 1 and 2.

ATX supplies are specified by total output (Watts), which include all voltages together, including +5V and +3.3V.  Therefore, the most important specification is the amount of +12V provided by the supply.  The Z420 supply does not provide +5V and +3.3V, so it is important that the +12V_B rail has enough power for these onboard regulators otherwise the system may not power up.  If the other +12V rails do not have enough power, and high-powered PCIe cards are installed in some slots, they might not have enough power and the system could crowbar. 

All this means that the Z420 needs several separate high power +12V rails to work correctly. 

HP Workstations are designed as a total system, to optimize performance.  That is why HP does not use ATX power supplies in these high-end and high-power Workstations. 

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[TheBense]

I ❤️ this thread 

[Bobthepan]

Could this the link voltage booster be used to push bump the voltage up on the standby line to power the on cicriit?https://www.amazon.com/dp/B01KUYERYA/ref=asc_df_B01KUYERYA5333268/?tag=hyprod-20&creative=395033&cre...

[asket3man]

Tell 18-pin main power (p1) identical with the z820 or z420 z620 ? And what is the Pinout 8-pin PWR CPU0 (P3) 8-pin PWR MEM (P2), 6-pin PWR CPU1 (P4)? And maybe there is a schematic of the mainboard (motherboard) Hp Z820 WS? I would be very grateful.