Hier auch nochmal der Media Reviewers Guide von AMD zum Ryzen 1700X und 1800X unter dem Kapitel Overclocking auf Seite 32 sind auch nochmal die Infos.
AMD Ryzen 7 1700X Processor Reviewer's Guide 1.2.pdf - Google Drive
AMD Ryzen 7 1800X Processor Reviewer's Guide (2).pdf - Google Drive
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As a general guideline: a CPU voltage of 1.35V is acceptable for driving everyday overclocks of the AMD Ryzen processor.
Core voltages up to 1.45V are also sustainable, but our models suggest that processor longevity may be affected.
Regardless of your voltage, make sure you’re using capable cooling to keep temperatures as low as possible.
While there are never guarantees with overclocking, the majority of users should find that an 8C16T AMD RyzenTM
processor will achieve 4.2 GHz @ 1.45V of CPU voltage. Advanced and accomplished overclockers trying to push record
frequencies may find more headroom by disabling cores and disabling SMT on motherboards that offer the option in the
BIOS.
Overclocking specifics
CPU clockspeed is configured with MULTI*Ref_Clk. AMD RyzenTM CPUs have 0.25X multipliers.
1. Ref_clk is 100MHz.
2. While the ref_clk value is adjustable, system stability may be compromised when deviating from this
value.
3. Users are encouraged to use the unlocked multipliers.
AMD RyzenTM processors do not use pre-programmed VID tables.
1. Therefore, there is no fixed Vcore when the CPU runs in its out-of-box condition.
2. Default Vcore will vary depending on workload and will range from 1.2-1.3625V.
3. Overclocking an AMD RyzenTM processor will snap the voltage to 1.3625V, but this value can be changed.
Voltages to look for:
1. CPU Vcore: Look for CPU VID value (type in value)
2. CPU SoC voltage: Look for VDDCR_SOC value (type in value). Default is 0.99V. Adjusting this may help
stabilize memory overclocks.
3. Memory voltage: Look for MEM_VDDIO (type in value) and MEM_VTT (set MEM_VTT to 1⁄2 of
MEM_VDDIO). VDDIO is voltage (“memory voltage”) supplied to the DRAM ICs, and MEM_VTT powers
termination logic inside the DRAM ICs. These values are OFFSETS and will read as zero. Boost Memory
VDDIO to stabilize memory overclocking. (e.g. MEM_VDDIO set to +0.025 will bring 1.5V DRAM to
1.525V.)
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