prime95 at 4.4 ghz on an i7 6700k with overclocking
prime95 at 4.4 ghz on an i7 6700k with overclocking
VCCIN was Haswell (1150) with a single 1.8 VDC input rail. Skylake modified this by removing the integrated voltage regulator for vCore, and even returning to Haswell's configuration at 1.9 should be unnecessary for most setups unless dealing with extreme overvoltages.
Does it really matter that my GPU has a slight occlusion (beyond factory settings)?
Could it be that my PSU isn't supplying power via both the 4+4 pins? Just guessing here, okay?
Also, I've noticed the system sometimes displays this error: whea_uncorrectable_error.
Regardless, I think a 4.3 GHz or even 4.0 GHz i7 is still quite acceptable.
I've managed to incorporate bios and driver updates, which enabled me to use the XMP profile that was previously unavailable. This also allowed me to enter gaming boost mode, although I won't be using it.
I attempted a 4.4 build with 2133 mhz DDR4 on ROG and Prime, but both systems crashed. I'm uncertain about the VCCin voltage setting in BIOS, possibly referring to something specific for Skylake.
On my 4770k (Asus Maximus Formula) machine, exceeding a 42 CPU multiplier required a VCCin adjustment. I began with a 1.9v setting just to resolve the issue and settled on 1.88 after fine-tuning. This pattern was consistent across all Haswell and Devils Canyon builds we worked on, though the exact threshold varied by model.
We also observed that higher VCCin values sometimes enabled lower Vcore settings. Skylake handled the transition differently, with MoBo managing the process for Haswell models. Without access to the specific manufacturer's adjustments, I can't determine what changes were needed or how they differed.
VCCIO required manual boosting to maintain memory stability at high XMP levels. The approach to adjusting other voltages depends on the manufacturer's settings, but you decide how these changes are implemented by selecting the desired method. Generally, a starting Vcore voltage of 1.35 volts is recommended for overclocking.
Adjustment options include:
1. Fixed V/F – Voltage rises automatically from lowest to turbo and stays constant.
2. Interpolated V/F – Voltage increases similarly with a set range.
3. Offset – Voltage adjusts automatically based on a positive or negative offset you choose.
4. Override V/F – Voltage remains at the maximum needed for stable overclocking, disabling power-saving features.
Other relevant settings to consider are Load-line Calibration (VDROOP), which reduces voltage under increased load, and the Maximum Power Consumption setting, which should be adjusted for higher overclocks.
Initial steps after BIOS/UFi updates:
1. Reset all BIOS parameters to defaults.
2. Set Vcore to 1.35.
3. Run RoG Real Bench; raise Vcore if needed for stability, but stay below 1.45 and temperature limits.
4. Test XMP settings again; consider increasing VCCIO if using high-speed RAM.
5. Once stable, reduce aggressiveness on LLC and Vcore.
Additional notes:
- FCLK should be ignored unless using a 7xx GFX card.
- BCLK calculations are complex; adjusting it can help with stability.
- Performance drops can occur if cache multiplier exceeds CPU multiplier (above 3).
- The platform supports overclocks up to 5.0%, but only 2-3% of builds reach this.
- Average OC settings sit around 4.70, with most systems in the 4.5-4.8 range.
- Vcore typically stays near 1.375.
JackNaylorPE shared their experiences and insights on various overclocking scenarios. They mentioned successfully implementing XMP profiles and enabling gaming boost, though they didn't plan to use it. They faced issues with 4.4 at 2133 mhz DDR4 speeds on ROG and Prime systems, which caused crashes. They were unsure about the VCCin voltage setting in BIOS, especially for Skylake configurations.
On their 4770k (Asus Maximus Formula) build, they found that exceeding a certain CPU multiplier required a specific VCCin value. They started with 1.9 volts to bypass this issue and settled on 1.88 after adjusting maximum multipliers. This pattern was consistent across Haswell and Devils Canyon builds, though the optimal VCCin varied by manufacturer.
They noted that Skylake handled Haswell IVR differently, and without access to other locations, they couldn't determine all voltage adjustments. VCCIO required manual boosting for stable memory under high XMP settings. Adjustments were controlled by the manufacturer, but users could choose how these changes were implemented. The recommended starting Vcore was around 1.35 volts.
Options for voltage adjustments included fixed V/F, interpolated V/F, offset, and overriding V/F. Each method had its own approach to maintaining stability. Load-line calibration (VDROop) was also important for managing voltage under load. The maximum power setting needed tuning for higher overclocks.
After BIOS/UFi updates, recommended steps were: reset BIOS settings, set Vcore to 1.35, run RoG benchmarks, and then fine-tune VCCIO if necessary. Other settings like BCLK and cache multiplier also required attention. Performance varied, with most systems achieving around 4.5-4.8 GHz, though some struggled with higher overclocks. The user was cautious about power consumption and thermal limits.