P55A-UD3R and i5 750 overclock problem

[gomango]

Hi guys,

I'm back with my new rigg which I had thought I had just got stable at 3.8ghz - 24hrs+ Prime Blend stable. However, I had been a little bit lazy and not set all the BIOS settings for the "Advanced CPU Core Features" and had left them all on "Auto" - when like this the machine is stable. However, when I go to change those setting to "Enabled" (as below) the machine BSODs at boot up.

Intel(R) Turbo Boost Tech ................... [Enabled]
CPU Cores Enabled ........................... [All]
CPU Enhanced Halt (C1E) ..................... [Disabled]
C3/C6 State Support ...................... [Enabled]
CPU Thermal Monitor ......................... [Enabled]
CPU EIST Function ........................... [Enabled]
Bi-Directional PROCHOT ...................... [Enabled]

I can't for the life of me work out why the machine was stable with these "Advanced CPU Core Features" set on Auto and not when Enabled as I had assumed Auto meant Enabled in this context? I assume Enabled is better as it will save power. Can somebody please help me work out how to get my machine stable again with these settings Enabled?

My rigg is as follows:
p55A-UD3R
i5 750
G-Skill Eco 1600 9-9-9-24 1.35v
ATI 4650

My basic overclocking settings are as follows:

CPU Clock Ratio ............................. [20x]
CPU Frequency ................................ 3.62GHz (181x20)
QPI Link Ratio .............................. [Auto]

Base Clock (BCLK) Control ................ [Enabled]
BCLK Frequency (MHz) ..................... [181]
Extreme Memory Profile (X.M.P) ......... [Disabled]
System Memory Multiplier (SPD) ........ [8.0]
Memory Frequency (Mhz) ................ 1448
PCI Express Frequency (MHz) .............. [100]

DRAM Timing Selectable (SPD) .......... [Quick]
Profile DDR Voltage ................... xxxxV
Profile QPI Voltage ................... xxxxV
Channel Interleaving .................. [Auto]
Rank Interleaving ..................... [Auto]

Channel A Timing Settings:
##Channel A Standard Timing Control##
CAS Latency Time ........................... 9 [9]
tRCD ....................................... 9 [9]
tRP ........................................ 9 [9]
tRAS ....................................... 24 [24]


Load Line Calibration ...................... [disabled]
CPU Vcore .......................... 1.6875V [1.33750V]
Dvid ................................. Auto
QPI/VTT Voltage .................... 1.100V [1.250V]
PCH Core .............................. 1.050V [Auto]
CPU PLL ............................ 1.800V [Auto]

MCH/ICH
PCIE .............................. 1.500v [auto]
QPI PLL ........................... 1.100v [auto]
IOH Core ........................... 1.100v [auto]
ICH I/O ............................ 1.500v [auto]
ICH Core ........................... 1.100v [auto]

DRAM
DRAM Voltage ....................... 1.500V [1.500V]
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]

O don't know what to do next. Any help would be most appreciated. Thanks in advance.

[wazza300]

Re: P55A-UD3R and i5 750 overclock problem

auto can mean on or off,depends on what the bios uses to remain stable when on auto,

QPI/VTT Voltage .................... 1.100V [1.250V] could try with 1.3000v,cpu voltage seems high for 3.8ghz too,remember too much voltage can cause bsod as much as too little,you should try with around 1.2-1.25 with 3.8ghz for your cpu voltage

you might have better luck setting cpu voltage to the normal setting in the voltage list,and using +0.0750v in dvid,enable all advanced cpu features except c1e,then from inside windows power saving options select balanced,that way the cpu will throttle voltage/speed at idle but not under load,if unstable add two more clicks up on dvid voltage and retry

[gomango]

Re: P55A-UD3R and i5 750 overclock problem

Thanks for your suggestion Wazza - I'll try it out.

I don't actually know what DVID is - do you have a link to something that explains it or could you help me out with a short explanation. My old Q9550 rig didn't have this setting.

Thanks again!

[Lsdmeasap]

Re: P55A-UD3R and i5 750 overclock problem

I wouldn't play with DVID again until you are stable with the other settings you are trying to enable/disable

[wazza300]

Re: P55A-UD3R and i5 750 overclock problem

all dvid does is add +0.0XXXv amount of extra voltage at load,cpu will only throttle if set to auto voltage which isnt recomended or normal,any other setting and it wont throttle down at idle,try and use less cpu voltage and get it stable first like lsdme says then you can play around with dvid if you want to,i dont find any problems clocking this way

[gomango]

Re: P55A-UD3R and i5 750 overclock problem

OK, I think I've found what was causing the instability at 3.82Ghz (191*20) and am now trying for 4.0Ghz. I think the problem was the "Turbo Boost" setting being "Enabled" as the processor was trying to run a single core up to 4.3Ghz during the boot process. Does that sound right? Anyway, I've turned it off so that the settings are as below and the machine is booting without BSOD and Prime Stable for 24hrs.

Intel(R) Turbo Boost Tech ................... [Disabled]
CPU Cores Enabled ........................... [All]
CPU Enhanced Halt (C1E) ..................... [Disabled]
C3/C6 State Support ...................... [Enabled]
CPU Thermal Monitor ......................... [Enabled]
CPU EIST Function ........................... [Enabled]
Bi-Directional PROCHOT ...................... [Enabled]

Wazza300, I am still running quite high volts compared to what you have suggested. The CPU is set in BIOS at 1.34V and under load runs between 1.26V and 1.28V (CPUz Prime Blend 4 cores). I tried lower volts but either it wouldn't boot or would fail Prime. My temps are OK - 67c to 71c Max (Core Temp) so these voltages should be safe I think? Is there something I'm doing that is causing me to need such high voltages?

I'm now trying for 4.0Ghz which I can get Prime stable for 24Hrs with the following settings:

Intel(R) Turbo Boost Tech ................... [Auto]
CPU Cores Enabled ........................... [All]
CPU Enhanced Halt (C1E) ..................... [Auto]
C3/C6 State Support ...................... [Auto]
CPU Thermal Monitor ......................... [Auto]
CPU EIST Function ........................... [Auto]
Bi-Directional PROCHOT ...................... [Auto]


but the PC won't boot if I enable the power saving features as below (with Turbo Boost off):

Intel(R) Turbo Boost Tech ................... [Disabled]
CPU Cores Enabled ........................... [All]
CPU Enhanced Halt (C1E) ..................... [Disabled]
C3/C6 State Support ...................... [Enabled]
CPU Thermal Monitor ......................... [Enabled]
CPU EIST Function ........................... [Enabled]
Bi-Directional PROCHOT ...................... [Enabled]

I've tried adding more CPU volts (up to 1.45V) and more PLL volts (up to 1.31) but can't seem to get it to boot without BSOD. What should I try next?

Thanks again for your help.

[wazza300]

Re: P55A-UD3R and i5 750 overclock problem

you should need slightly less if turbo is disabled,those voltages are ok,what are you using now 1.34? for cpu and what for qpi/vtt?? try with cpu voltage on normal and dvid of +0.0750v,keep all c states enabled except for c1e