F5F Stay Refreshed Power Users Overclocking The ASUS PRIME Z270-A BIOS 1203 fails to boot using XMP settings.

The ASUS PRIME Z270-A BIOS 1203 fails to boot using XMP settings.

The ASUS PRIME Z270-A BIOS 1203 fails to boot using XMP settings.

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Askatal
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04-17-2025, 08:47 PM
#1
I managed to resolve this after many attempts. Below is the process I followed. For clarity, you can compare it with my previous BIOS versions and the current one (1203).
Motherboard: ASUS PRIME Z270-A
CPU: Intel Core i7-7700K Kaby Lake Quad-Core 4.2 GHz
Memory: G.SKILL TridentZ DDR4-3200 16GBx2 CL16-16-16-36
BIOS 0906
(XMP works)
XMP settings applied: 16-16-16-36 @ 3200Mhz
DRAM Voltage: 1.3530 (set via XMP profile)
CPU VCCIO Voltage: Auto
CPU System Agent Voltage: Auto
BIOS 1009
(XMP not applicable)
XMP settings applied: 16-16-16-36 @ 3200Mhz
DRAM Voltage: 1.3728 (manually configured)
CPU VCCIO Voltage: ...
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A
Askatal
04-17-2025, 08:47 PM #1

I managed to resolve this after many attempts. Below is the process I followed. For clarity, you can compare it with my previous BIOS versions and the current one (1203).
Motherboard: ASUS PRIME Z270-A
CPU: Intel Core i7-7700K Kaby Lake Quad-Core 4.2 GHz
Memory: G.SKILL TridentZ DDR4-3200 16GBx2 CL16-16-16-36
BIOS 0906
(XMP works)
XMP settings applied: 16-16-16-36 @ 3200Mhz
DRAM Voltage: 1.3530 (set via XMP profile)
CPU VCCIO Voltage: Auto
CPU System Agent Voltage: Auto
BIOS 1009
(XMP not applicable)
XMP settings applied: 16-16-16-36 @ 3200Mhz
DRAM Voltage: 1.3728 (manually configured)
CPU VCCIO Voltage: ...

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WeedPig
Junior Member
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41
04-17-2025, 08:47 PM
#2
I managed to resolve the issue after many attempts. Here’s the process I followed, along with the BIOS versions used for comparison. This should help you understand the changes made.
My setup included: Motherboard ASUS PRIME Z270-A, CPU Intel Core i7-7700K Kaby Lake Quad-Core at 4.2 GHz, 16GBx2 G.SKILL TridentZ DDR4-3200 memory, BIOS version 0906 (XMP supported), and later BIOS 1009/1203. I’ll compare these to see the evolution.
Initially, I tried what I did previously for BIOS 1009—raising the DRAM voltage. As I ventured into the 1.4V range, I became concerned it might be excessive, so I stopped. Then I opted for a lower frequency to observe the automatic settings more clearly. I activated XMP and manually set the DRAM frequency below the XMP profile’s 3200MHz, aiming for something like 2933MHz. I experimented with various frequencies until the system started booting and the BIOS settings remained consistent (default resets on failure). Setting it above the original 2133MHz allowed me to observe higher-than-usual voltages: DRAM at 1.4720, VCCIO at 1.024, and System Agent at 1.232.
From these readings, I deduced that achieving stable automatic values would require a much higher DRAM voltage. After some research, I decided to temporarily raise it to around 1.5V. I kept XMP enabled and adjusted the DRAM frequency accordingly. After each change, I restarted the system. Eventually, reaching 1.5048V allowed the PC to boot successfully.
I checked the BIOS interface for the current VCCIO and System Agent voltages, which remained set to Auto. The values were:
DRAM Voltage: 1.5048 (manually configured)
CPU VCCIO Voltage: 1.2560 (Auto)
CPU System Agent Voltage: 1.3360 (Auto)
These readings were quite high. I then adjusted the VCCIO and System Agent voltages manually to match the XMP profile’s 3200MHz setting, aiming for values close to the automatically set ones at 1.5048V. This configuration worked—boots occurred with the XMP DRAM voltage of 1.3530. However, the VCCIO and System Agent voltages remained elevated. I lowered them gradually, eventually reaching 1.1375V, which was just below the threshold where they began to exceed specifications (indicating a "yellow" warning).
My final configuration was:
- XMP: Enabled, DRAM at 3200MHz
- DRAM Voltage: 1.3530 (XMP spec)
- CPU VCCIO: 1.2625 (manual)
- CPU System Agent: 1.3760 (manual)
This setup resolved the issue and allowed stable operation.
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W
WeedPig
04-17-2025, 08:47 PM #2

I managed to resolve the issue after many attempts. Here’s the process I followed, along with the BIOS versions used for comparison. This should help you understand the changes made.
My setup included: Motherboard ASUS PRIME Z270-A, CPU Intel Core i7-7700K Kaby Lake Quad-Core at 4.2 GHz, 16GBx2 G.SKILL TridentZ DDR4-3200 memory, BIOS version 0906 (XMP supported), and later BIOS 1009/1203. I’ll compare these to see the evolution.
Initially, I tried what I did previously for BIOS 1009—raising the DRAM voltage. As I ventured into the 1.4V range, I became concerned it might be excessive, so I stopped. Then I opted for a lower frequency to observe the automatic settings more clearly. I activated XMP and manually set the DRAM frequency below the XMP profile’s 3200MHz, aiming for something like 2933MHz. I experimented with various frequencies until the system started booting and the BIOS settings remained consistent (default resets on failure). Setting it above the original 2133MHz allowed me to observe higher-than-usual voltages: DRAM at 1.4720, VCCIO at 1.024, and System Agent at 1.232.
From these readings, I deduced that achieving stable automatic values would require a much higher DRAM voltage. After some research, I decided to temporarily raise it to around 1.5V. I kept XMP enabled and adjusted the DRAM frequency accordingly. After each change, I restarted the system. Eventually, reaching 1.5048V allowed the PC to boot successfully.
I checked the BIOS interface for the current VCCIO and System Agent voltages, which remained set to Auto. The values were:
DRAM Voltage: 1.5048 (manually configured)
CPU VCCIO Voltage: 1.2560 (Auto)
CPU System Agent Voltage: 1.3360 (Auto)
These readings were quite high. I then adjusted the VCCIO and System Agent voltages manually to match the XMP profile’s 3200MHz setting, aiming for values close to the automatically set ones at 1.5048V. This configuration worked—boots occurred with the XMP DRAM voltage of 1.3530. However, the VCCIO and System Agent voltages remained elevated. I lowered them gradually, eventually reaching 1.1375V, which was just below the threshold where they began to exceed specifications (indicating a "yellow" warning).
My final configuration was:
- XMP: Enabled, DRAM at 3200MHz
- DRAM Voltage: 1.3530 (XMP spec)
- CPU VCCIO: 1.2625 (manual)
- CPU System Agent: 1.3760 (manual)
This setup resolved the issue and allowed stable operation.

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