How to Upgrade Your HP Z4 G4 Workstation CPU Safely

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If you’re planning to upgrade your HP Z4 G4 Workstation with an Intel Core i9-10920X processor, there’s good news—it’s absolutely possible! Many users, including one recent member of our community, have successfully installed this high-wattage CPU without issues. Here’s a simple guide to help you do it safely and properly.

First, make sure your system’s BIOS is updated to the latest version, specifically version 03.00 Rev.A, also known as the “HP Z4-G4 Core-X WKS System BIOS” (file name: sp173148.exe). You can find this update on HP’s support page. Updating the BIOS before installing the new CPU is essential because it ensures your system recognizes high-power processors correctly.

If your BIOS isn’t updated yet, download and run the BIOS update file while your current CPU, like an i7-7800X, is installed. After completing the update, shut down your system, swap out the old CPU for the i9-10920X, and power everything back on.

It’s important to know that the standard heatsink that comes with the HP Z4 G4 Workstation isn’t designed for high-wattage CPUs like the i9-10920X. The stock heatsink is rated for processors up to 140 watts, but your new processor has a TDP of 165 watts. Running a higher-power CPU without upgrading the cooling system can trigger an error message (especially the “912-Computer Cover Fan Not Detected” code) during startup. This happens because the motherboard detects the cooling system isn’t capable of handling the processor’s heat output.

To properly cool the i9-10920X, you have two main options:

1. Use HP’s Official High-Power CPU Cooling Kit: HP offers a dedicated high-performance cooling solution (part numbers L29299-001 or 781907-001) designed for higher-wattage processors. Installing this kit ensures proper heat dissipation without any hassle.

2. Use a Community-Modified Cooling Solution: Many users have found success by swapping the stock heatsink with a more robust cooler from an older HP Z440 workstation. When combined with a simple 6-pin to 5-pin fan adapter (part number L12790-001), this cooler can fool the motherboard into recognizing it as a compatible high-wattage cooler, preventing errors and providing excellent thermal performance.

Another thing to be aware of is your rear memory fan. If you install the i9-10920X and leave the 6-pin memory fan header empty, your system will display a “513-Configuration Requires a Front/Rear Memory Fan” POST error.

High-wattage processors like the i9-10920X require proper cooling for both the CPU and memory modules, which HP’s firmware enforces. For high-power chips, you must install the official memory cooling kit (part number 927570-001, 927570-002, or 1XM34AA). This small cooling module clips onto the memory banks and connects to the motherboard’s designated fan header, ensuring your system runs smoothly.

Finally, upgrading your CPU from an i7-7800X to an i9-10920X will also allow your system to use faster memory—up to DDR4-2933 MHz. Check that your existing RAM modules support this speed, or BIOS will automatically adjust the settings to run at the highest supported frequency.

By following these steps—updating BIOS, choosing the right cooling solution, and installing the necessary memory cooling—you can upgrade your HP Z4 G4 Workstation confidently and ensure it runs efficiently with your new high-performance processor.