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Hello, @FasUPy
In addition to Silent_Scone's post, for information on memory overclocking settings and troubleshooting, please refer to [Motherboard] How to optimize Memory performance by setting XMP or DOCP in BIOS?
Also, ASUS has verified the motherboard for the best stability and compatibility when installed with the devices in the Memory QVL list.
Therefore, kindly consult the "purchasing and installation guide" in the Support page>CPU>Memory section of the official website for the ROG MAXIMUS Z790 HERO, as well as the installation slot recommendations in the user manual.
・Overclocking memory involves boosting memory frequency or tightening timings. It's essential to note overclocking memory may not always improve performance. Increasing memory frequency can boost read and write speeds while tightening timings can improve copy and latency performance. In gaming, low latency is often more important than high frequency.
・Running EXPO/D.O.C.P at DDR5 6400 or higher may not yield proportional memory performance gains due to current AMD processor architecture limitations.
・When installing a memory kit, please adhere to the DIMM slot priority cited in the Memory installation section of the product manual.
・Ensure that all memory modules are from the same validated memory kit. Do not mix DIMMs from different memory kits—even if they are the same brand and model (e.g., two DIMMs each from two different memory kits). Mixing and matching DIMMs can result in a failure to boot and compatibility issues. In particular, the stability of a system with mixed DIMMs cannot be guaranteed when XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII is enabled. For example, enabling XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII to speeds above DDR5 4800MHz or above DDR4 3200MHz could result in an unstable system.
・The stability and compatibility of memory kits operating beyond the POR standard, such as XMP (Intel), D.O.C.P (AMD), EXPO (AMD), AEMP, and AEMP II, are not guaranteed, as they can be affected by the CPU's memory controller, installed devices, and bus frequencies. For better compatibility, use DIMMs with the same CAS latency, and consider memory modules from the same vendor with matching version or date code. DDR5 speed may vary depending on the number of memory modules; generally, 2 DIMMs offer faster performance compared to 4 DIMMs, with actual speeds depending on your platform and configurations.
・The default DIMM frequency depends on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. To set the rated speed of the kit, please select XMP(Intel)/D.O.C.P(AMD)/EXPO(AMD)/AEMP/AEMPII or apply manual settings.
・When installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.
Thank you.
Hello, @FasUPy
In addition to Silent_Scone's post, for information on memory overclocking settings and troubleshooting, please refer to [Motherboard] How to optimize Memory performance by setting XMP or DOCP in BIOS?
Also, ASUS has verified the motherboard for the best stability and compatibility when installed with the devices in the Memory QVL list.
Therefore, kindly consult the "purchasing and installation guide" in the Support page>CPU>Memory section of the official website for the ROG MAXIMUS Z790 HERO, as well as the installation slot recommendations in the user manual.
・Overclocking memory involves boosting memory frequency or tightening timings. It's essential to note overclocking memory may not always improve performance. Increasing memory frequency can boost read and write speeds while tightening timings can improve copy and latency performance. In gaming, low latency is often more important than high frequency.
・Running EXPO/D.O.C.P at DDR5 6400 or higher may not yield proportional memory performance gains due to current AMD processor architecture limitations.
・When installing a memory kit, please adhere to the DIMM slot priority cited in the Memory installation section of the product manual.
・Ensure that all memory modules are from the same validated memory kit. Do not mix DIMMs from different memory kits—even if they are the same brand and model (e.g., two DIMMs each from two different memory kits). Mixing and matching DIMMs can result in a failure to boot and compatibility issues. In particular, the stability of a system with mixed DIMMs cannot be guaranteed when XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII is enabled. For example, enabling XMP (Intel)/D.O.C.P (AMD)/EXPO (AMD)/AEMP/AEMPII to speeds above DDR5 4800MHz or above DDR4 3200MHz could result in an unstable system.
・The stability and compatibility of memory kits operating beyond the POR standard, such as XMP (Intel), D.O.C.P (AMD), EXPO (AMD), AEMP, and AEMP II, are not guaranteed, as they can be affected by the CPU's memory controller, installed devices, and bus frequencies. For better compatibility, use DIMMs with the same CAS latency, and consider memory modules from the same vendor with matching version or date code. DDR5 speed may vary depending on the number of memory modules; generally, 2 DIMMs offer faster performance compared to 4 DIMMs, with actual speeds depending on your platform and configurations.
・The default DIMM frequency depends on its Serial Presence Detect (SPD), which is the standard way of accessing information from a memory module. Under the default state, some memory modules for overclocking may operate at a lower frequency than the vendor-marked value. To set the rated speed of the kit, please select XMP(Intel)/D.O.C.P(AMD)/EXPO(AMD)/AEMP/AEMPII or apply manual settings.
・When installing total memory of 4GB capacity or more, Windows 32-bit operation system may only recognize less than 3GB. Hence, a total installed memory of less than 3GB is recommended.
Thank you.
