ROG Rampage III Extreme on phase change

[slavic1705]

I seem to have hit a wall on my overclocking and could use some help. Below are my bios settings I can run prime95 for up to at least half hour at a BCLK 190 with no problems however when I try 195 it crashes within 2 or 3 minutes. I have upped the V-Core a couple of times with no noticeable improvement. I am hoping to get to 5 ghz or a BCLK of 210 does this seem unreasonable? I am cooling the CPU with a phase change unit and I am currently at about -15F under full load at the EVAP. Unfortunately the on board thermal senor locks up at about 10F and won't report anything else. The north and south bridge are both cooled with a water block. I have not changed any of the memory settings. I hope to use this for gaming. Any suggestions would be appreciated.

i7-950 Bloomfield
CORSAIR XMS 6GB (3 x 2GB) 240-Pin DDR3 SDRAM DDR3 2000 (PC3 16000) Desktop Memory Model CMX6GX3M3B2000C9
CORSAIR Professional Series Gold AX850 (CMPSU-850AX) 850W

BIOS SETTINGS:

Target CPU Frequency 4560MHz
Target DRAM Frequency 1143MHz

LN2 Mode: Disabled***
QPI Loadline Calibration: Disabled***

Sync Mode [Disabled]
AI Overclock Tuner [Manual]
OC From CPU level Up [Auto]

CPU Ratio Setting [24.0]
CPU Turbo Power Limit [Disabled]

>CPU Configuration----------------------------
CPU Ratio Setting [24.0]
C1E Support [Disabled]
Hardware Prefetcher [Enabled]
Adjacent Cache Line Prefetcher [Enabled]
MPS and ACPI MADT ordering [Modern]
Intel(R) Virtualization Tech [Disabled]
CPU TM Function [Disabled]
Execute Disable Bit [Enabled]
Intel(R) HT Technology [Disabled]
Active Processor Cores [All]
A20M [Disabled]
Intel(R) SpeedStep(TM) Tech [Disabled]

Intel(R) C-STATE Tech [Disabled]



----------------------------------------------

BCLK Frequency [190]
PCIE Frequency [108]
DRAM Frequency [DDR3-1143MHz]
UCLK Frequency [2286Mhz]
QPI Link Data Rate [Slow Mode]

Memory Configuration Protect [Disabled]

CPU Differential Amplitude [Auto]
CPU Clock Skew [Auto]
IOH Clock Skew [Auto]
------------ Extreme Engine Digi+ ------------
Digi+ PWR Mode [X-Power]
PWR Volt. Control [Auto]
Load-Line Calibration [Auto]
CPU Voltege OCP [Enabled]
CPU PWM Frequency [Auto]

Extreme OV [Disabled]*
Extreme OC [Auto]

CPU Voltage 1.343 [1.35000]
CPU PLL Voltage 1.349 [1.88150]
QPI/DRAM Core Voltage 1.429 [1.41250]
DRAM Bus Voltage 1.654 [1.61650]

>DRAM REF Voltages----------------------------
DRAM DATA REF Voltage on CHA [Auto]
DRAM CTRL REF Voltage on CHA [Auto]
DRAM DATA REF Voltage on CHB [Auto]
DRAM CTRL REF Voltage on CHB [Auto]
DRAM DATA REF Voltage on CHC [Auto]
DRAM CTRL REF Voltage on CHC [Auto]
----------------------------------------------

IOH Voltage 1.111 [Auto]
IOH PCIE Voltage 1.508 [Auto]

ICH Voltage 1.111 [Auto]
ICH PCIE Voltage [Auto]

*QPI Voltage OCP [Enabled]
*IOH Voltage OCP [Enabled]
*DRAM Voltage OCP [Enabled]
*QPI PWM Frequency [Auto]
*IOH PWM Frequency [Auto]
*DRAM PWM Frequency [Auto]

---------- Spread Spectrum Control -----------
CPU Spread Spectrum [Disabled]
DRAM Spread Spectrum [Disabled]



***on-board jumper dependant

[Leeghoofd]

5Ghz might be very unreasonable with Bloomfield for daily usage. Unless you have a gem CPU. Probably what's causing the instability is ya ram speed and the uncore speeds required. I would drop down a ram divider to regain stability.

1)set Bclock to 200,
2)CPU Multiplier to 23X ( for 4.6Ghz ), up to 1.375Vcore --> Bloomfield loves odd multipliers, even multipliers require more voltages to stabilise...
3) set ram divider for 2000mhz action, keep uncore at 4Ghz --> Reduce QPI ram voltage to eg 1.37... (test with HyperPi 32M 4 threads)
4) QPI Slow mode ? Are you kidding me ? 3D performance is reduced to 10% of it's real possibilities, set to lowest value (not to lowest :p)

Honestly gaming performance will hardly improve with more CPU speed or higher ram clocks. At a certain moment your GPU setup will be the most limiting factor and even a 6ghz CPU will not boost in game FPS performance.

A 4.5-4.6GHz daily Bloomfield is already a very nice overclock, I know you are on phase change, but CPU temps will be positive under heavy load

[Hondacity]

vcore too low
mem multi too high

[zsamz_]

QPI Loadline Calibration: Disabled***

you need to set the jumper to ennable QPI Loadline Calibration

you not goin too far withought it