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i7 920 C-Step 3.8GHz OC Assistance Please

post #1 of 5
Thread Starter 
I had my i7 920 C-Step at 4GHz on a Gigabyte EX-58-Extreme Rev.01 motherboard with the latest BIOS, but I've been experiencing accelerating issues which point to my overclock.

After deciding to back it down to 3.8GHz (and dropping 20c full-burn Prime95) the overclock seems stable when running a Custom, 4-thread, Min 8 Max 8 test with FFTs in-place and a timeout of 60 minutes for hours at a time. The Cores never go over 65c during this.

I'm failing (Prime95 crash) or BSODing every other test type though. Seven passes of MemTest show my memory is fine (not XMP modules, had to set in the BIOS).

Here is my profile:

Code:
Advanced CPU Features:
CPU Clock Ratio ................................ [19x]
Intel(R) Turbo Boost Tech .................. [Disable]
CPU Cores Enabled ............................ [All]
CPU Multi Threading .......................... [Disabled]
CPU Enhanced Halt (C1E) ................... [Disabled]
C3/C6/C7 State Support ....................
[Disabled]
CPU Thermal Monitor ......................... [Enabled]
CPU EIST Function ............................ [Disabled]
Virtualization Technology ................... [Disabled]
Bi-Directional PROCHOT ..................... [Enabled]


Uncore & QPI Features:
QPI Link Speed .............................. x36
Uncore Frequency ..........................  x17 [3400MHz]
Isonchronous Frequency ..................[Enabled]


Standard Clock
Control:
Base Clock (BCLK) Control ................ [Enabled]
BCLK Frequency (MHz) .....................200
PCI Express Frequency (MHz) ........... [100]

C.I.A.2 [Disabled]

Advanced Clock Control:
CPU Clock Drive ..............................[800mV]
PCI Express Clock Drive ................... [900mV]
CPU Clock Skew ............................. [0ps]
IOH Clock Skew ............................. [0ps]


Advanced DRAM Features:
Performance Enhance ...................... [Standard]
Extreme Memory Profile (X.M.P) ......... [Disabled]
System Memory Multiplier (SPD) ........ [8.0]
DRAM Timing Selectable (SPD) .......... [Expert]

Channel A + B + C

Channel A Timing Settings:
##Channel A Standard Timing Control##
CAS Latency Time ...................... 7
tRCD ....................................... 7
tRP ......................................... 7
tRAS ....................................... 24

##Channel A Advanced Timing Control##
tRC ........................................ [Auto] 27
tRRD ....................................... [Auto] 4
tWTR ...................................... [Auto] 4
tWR ........................................ [Auto] 8
tWTP ....................................... [Auto] 19
tWL ........................................ [Auto] 7
tRFC....................................... [Auto] 60
tRTP ....................................... [Auto] 4
tFAW ...................................... [Auto] 16
Command Rate (CMD) ................ 2

##Channel A Misc Timing Control##
Round Trip Latency ................... [Auto] 51

B2B CAS Delay .......................... [Auto] -


Advanced Voltage Control:

CPU
Load Line Calibration ................. [Disabled]
CPU Vcore ............................... [1.3v]
QPI/VTT Voltage 1.150v ............ [1.335v]
CPU PLL 1.800v ....................... [1.84v]

MCH/ICH
PCIE 1.500v ........................... [1.54v]
QPI PLL 1.100v ....................... [1.2v]
IOH Core 1.100v ..................... [1.2v]
ICH I/O 1.500v ....................... [1.5v]
ICH Core 1.1v ........................ [1.24]

DRAM
DRAM Voltage 1.500v .............. [1.64v]
DRAM Termination 0.750v [AUTO]
Ch-A Data VRef. 0.750v [AUTO]
Ch-B Data VRef. 0.750v [AUTO]
Ch-C Data VRef. 0.750v [AUTO]
Ch-A Address VRef. 0.750v [AUTO]
Ch-B Address VRef. 0.750v [AUTO]
Ch-C Address VRef. 0.750v [AUTO]
Any thoughts? The BSODs I've seen are usually Error 50, and researching that points to PCI GPU issues. The other BSOD involved raising/lowering the QPI PLL voltage, but neither worked. In fact, adjustment of any type on the QPI PLL caused the system to freeze up within five minutes of Prime95 or cause the BIOS to default.

As I said, it can complete the Custom Test, but all other tests BSOD or freeze the computer, or the workers stop and Prime doesn't create a file relating to the errors.

Thoughts?
Edited by Maggard - 1/23/11 at 6:30pm
post #2 of 5
Thread Starter 
No thoughts?
post #3 of 5
the 50 error is IMC/Uncore or memory instability. usually IMC however. raise QPI/VTT voltage
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E8600 @ 5.8 -- 1.736v Rampage Formula! GTX550ti Vmod! OCZ D9's @ 1200+ cas 5 
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The 775 Legend
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CPUMotherboardGraphicsRAM
E8600 @ 5.8 -- 1.736v Rampage Formula! GTX550ti Vmod! OCZ D9's @ 1200+ cas 5 
OSMonitorPowerCase
XPEEEEEEEEEEEEEEEEEEEEEEE XGA 800x600 TR2-RX 850W Neoprene sheet 
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post #4 of 5
raise VTT to 1.375
Phobia
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Phobia
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1100T - 4.40Ghz 990FXA-UD7 VTX3D HD6990 Ripjaws - 1900Mhz CL8 
Hard DriveOSMonitorPower
S3 120gb SSD + 4 x 2TB green Win 7 Ultimate Panasonic 42" + BenQ G2420HD AX1200 
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600T White 
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post #5 of 5
Thread Starter 
I appreciate the help. I've made the suggested change but now another problem has crept up.

I'm now getting Error 9C during "custom" Prime95 within 30 minutes.

Temperatures remain the same. Mid-60's.
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