So i got 4Ghz stable on OCCT with TM and HT on Max temp 75c air cooled by Titan Fenrir which im happy with. im using the current BIOS settings for 4Ghz: Ai Overclock Tuner - Manual CPU Ratio Setting - Auto Intel (R) SpeedStep (TM) Tech - Enabled Intel (R) Turbo Mode Tech - Enabled BCLK Frequency - 190 PCIE Fequency - 100 DRAM Frequency - DDR3 - 1523MHz DRAM CAS# Latency - 8 DRAM Clock DRAM RAS# to CAS# Delay - 8 DRAM Clock DRAM RAS# PRE Time - 8 DRAM Clock DRAM RAS# ACT Time - 24 DRAM Clock CPU Voltage - 1.30000v CPU PLL Voltage - Auto QPI/DRAM Core Voltage - 1.3v IOH Voltage - Auto IOH PCIE Voltage - Auto ICH Voltage - Auto ICH Voltage - Auto DRAM Bus Voltage - 1.64v 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 Load-Line Calibration - Enabled CPU Differential Amplitude - Auto CPU Clock Skew - Auto CPU Spread Spectrum - Auto IOH Clock Skew - Auto PCIE Spread Spectrum - Auto ------------------------------ Now i would like to try and get 4.2Ghz so that i can get back to 1600Mhz RAM speed and reach the air cooled limit of my chip. I keep all the current settings but up the BCLK to 200 so make 4.2ghz on TM, but into the first 5 minit of testing i get the blue screen of death, any idea's? maybe 1.3500v?
how do you know 4.2Ghz is the air cooled limit of your chip? if you already know that's your limit, then surely you'll already know the required voltages. other people's limit doesn't mean it's your chip's, every chip is different. try tweak the PLL voltage, something like from 1.8v to 1.9v, and also up the CPU voltage, but keep an eye on the temperatures during load.
just meant that's the average safe limit people have been getting on air that's all also iv never moved the PLL voltage, but i know some people have to up it a little for 4Ghz+, what does it do? i just wont to know what im doing to my chip and not just jump in. thanks for the reply! from a quick google: "CPU PLL voltage (phase locked loop - a feedback control system that automatically adjusts the phase of a locally generated signal to match the phase of an input signal). This voltage used to be very important for successful overclocking of quad-core LGA775 processors, and is still important for overclocking Core i7. The nominal setting for this voltage is 1.8V, but Intel allows increasing it up to 1.88V without any risks for the processor." ill give 1.88 a try Edit: back, still blue screen on stress test but can boot into it fine...
Remember that your CPU may not be capable of 4.2GHz! Temporarily back off your memory timings to 9-9-9-24 whilst attempting to reach a new CPU speed. Try upping your QPI/DRAM Core Voltage to 1.45V (you may need higher but above 1.45 is 'danger' territory). Also, you need to set your IOH/ICH voltages. I can't remember my settings at the moment (I'm at work ) but I think they're at 1.25V Finally, you may have to up your CPU voltage - I can run mine at 1.3V but it's more stable at 1.325V. Some people need 1.45+V. The problem is that your temps are at a maximum 'acceptable' level and further overclocking WILL raise it - anything above 85C is a bit too hot.
i am happy with 4Ghz, its just i dont wont to have to de-clock my ram to get it, due to the ratio, it must be at X.2Ghz to enable me to use my ram at its stock 1600Mhz. thanks for the reply's
how about lower your CPU multi to get that magic 200Mhz Bclk and 1600Mhz RAM? general average of other people on the internet means nothing, your chip is not the same as other people's, some i7 920 D0 can't even do 3.6Ghz easily, while some does 4.4Ghz without a problem. what are your load temperatures at 4Ghz?
1600MHz isn't its 'stock' speed though. It's just the maximum speed the RAM manufacturer has said it's safe to run at. You might get more if you're lucky, but you wouldn't see any difference from running it at a lower frequency anyway. Have you tried changing the multi to 20 so a 200MHz base clock will still give you 4GHz? --- EDIT: ninja'd
From personal experience, the BCLK is the limiting factor. The CPU would be just as unstable with a 200MHz BCLK and a 20x multiplier as with a 21x multiplier.
with 12gb of RAM as you have then yes there are problems with a high BLCK, however the OP has 6gb and a P6T SE - which I can confirm goes to a 200mhz BLCK with no trouble.
I can do 200BCLK on a P6T-SE with 12GB RAM no problems (been running at 100% load for 3-4 months so far)
thats actually good to know. i have heard about problems with OCing with 12gb RAM but i cant recall which motherboards they are.
ill turn TM off then, bump it to 200 and give it a go. @wuyanxu im getting 75c full load on core 1-2 and 70c on core 3-4
mmm, my case does not provide great airflow, cant afford to get a new one and this one is still just under a year old, but 75c isnt to bad, would never get that high in normal use.
back with a new clock for 4Ghz and with RAM speed back to 1600mhz instead of 1500Mhz. im now running settings of: Ai Overclock Tuner - Manual CPU Ratio Setting - Auto Intel (R) SpeedStep (TM) Tech - Disabled Intel (R) Turbo Mode Tech - Disabled BCLK Frequency - 200 PCIE Fequency - 100 DRAM Frequency - DDR3 - 1600MHz DRAM CAS# Latency - 8 DRAM Clock DRAM RAS# to CAS# Delay - 8 DRAM Clock DRAM RAS# PRE Time - 8 DRAM Clock DRAM RAS# ACT Time - 24 DRAM Clock CPU Voltage - 1.32500v CPU PLL Voltage - Auto QPI/DRAM Core Voltage - 1.25v IOH Voltage - Auto IOH PCIE Voltage - Auto ICH Voltage - Auto ICH Voltage - Auto DRAM Bus Voltage - 1.64v 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 Load-Line Calibration - Enabled CPU Differential Amplitude - Auto CPU Clock Skew - Auto CPU Spread Spectrum - Auto IOH Clock Skew - Auto PCIE Spread Spectrum - Auto ------------------------------------- With them settings i could drop the QPI/DRAM Core Voltage to 1.25v from 1.30v which is always nice. But to get stable on Prime95/IntelburnTest with the new BCLK-200 i needed 1.325 CoreV, which isn't to bad but still a little high for a D0, but no chip is the same is it. Also PPL voltage didnt need moving from stock
