Haswell overclocking tips plz?

[ScottyJKB]

Very. My 4670k won't post at anything over 4.2Ghz without the CPU Input Voltage beind set to 1.900v.

Ouch

 

[Jamesyboyjim]

Doobedoo, Your Ranger bios can't be too different to my Hero's bios so below are my settings for 4.4Ghz.


AI Tweaker menu

AI Overclock Tuner - Manual
CPU Strap - 100mhz
PLL Selection - LC PLL
Filter PLL - Low BCLK Mode
BCLK Frequency - 100.0
Initial BCLK Frequency - Auto
Asus Multicore Enhancement - Auto
CPU Core Ratio - Sync All Cores
1x Core Ratio Limit - 44 (this sets the same for the other cores)
Min CPU Cache Ratio - 8x (might want to leave this alone until the cpu is stable)
Max CPU Cache Ratio - 44x (might want to leave this alone until the cpu is stable)
Internal PLL Pvervoltage - Auto
BCLK Frequency : DRAM Frequency Ratio - Auto
Dram Frequency - Set to whatever speed your ram is, 1333mhz in your case.
OC Tuner - As Is
EPU Power Saving Mode - Enabled
Dram Timing Control - enter your first 4 timings in the first four entries

Digi VRM+

CPU Loadline Calibration - Auto
CPU Voltage Frequency - Auto
VRM Spread Spectrum - Disabled
Active Frequency Mode - Disabled
CPU Power Phase Control - Auto
CPU Power Duty Control - T.Probe
CPU Current Capability - Auto
CPU Power Thermal Control - 130

CPU Power Management

Enhanced Intel Speedstep Technology - Enabled
Turbo Mode - Enabled
Set everything else to Auto

Extreme Overvoltage - Disabled
CPU Core Voltage - Manual Mode
CPU Core Voltage Override - 1.265v (May not need so much or may need more depending on the chip)
CPU Cache Voltage - Manual Mode (might want to leave this alone until the cpu is stable)
CPU Cache Voltage Override - 1.30v (might want to leave this alone until the cpu is stable)
Everything else down to CPU Input Voltage set to Auto.
CPU Input Voltage - 1.900v (mine actually needs this much but you may get away with 1.700v)
DRAM Voltage - Set to whatever your ram needs
Everything else set to Auto

Thanks for sharing, I'm going to cross reference these with my Hero + 4770k to see if our settings are much different, I'm always up for a tweak session

 

[BluD]

I think the general rule for Vccin is 0.4-0.5v above your vcore, so for instance if you're running a 1.35v vcore you'll want vccin around 1.75v to 1.85v. Just test different values, keep it under 2.2v though as your not extreme cooling

Yeah that sounds about right, i lowered mine to find out how much it actually needed and i only started getting crashing well below 1.7v with the cpu at 1.3v, i do use high LLC though. I guess some chips are a lot less efficient and need a lot higher. Its all in the guide, just dont increase voltages if you dont have to, if you can get them lower without compromising stability then do that also for lower temps.