Originally Posted by alexan_e
I guess I can try C&Q and see how it goes, thanks.
Can you please point me to your bios guide?
Here's the basic setup guide,
These are settings that I use (manually enter) with bios versions 1304, 1902, 2002, 2002 MOD bios, and are not the only options available, but are used by many others with good results. One option I have not worked with is the D.O.C.P (Dram Over Clock Profile) and if your Dram is an issue I’d encourage it’s use.
Ai Overclock Tuner – Manual
CPU Ratio - (16.0 for stock Thuban 3.2GHz)
AMD Turbo Core – Disable (not applicable with all CPU’s)
CPU Bus Freq - (200MHz for stock Thuban)
PCIE Freq – 100
Dram Freq – Manually enter Dram factory spec freq
Dram Timing Configuration – Manually enter factory timing specs and verify with CPUZ under memory tab
PWM Phase Control – Full Phase
CPU Voltage OCP – Enabled
CPU PWM Freq - Auto
CPU Load Line Calibration – Full - be sure and watch load voltage! Using this should allow a lower Vcore in bios. PM me if you’d like more info on LLC. Be careful and watch the Vcore while under load (1.5-1.55v max)
CPU/NB LLC – Full - be sure and watch load voltage
CPU/NB Voltage OCP – Enabled
Extreme OV – Disabled
CPU & NB Voltage Mode – Offset or Manual, using Offset Voltage allows use of Cool & Quiet up to a multiplier of 18x. (I encourage Offset Mode)
CPU VDDA voltage – Auto
Dram Voltage – Manually enter factory spec,
Be sure and test Dram with no OC using LinX or 32M run of SuperPi after booting into windows. You may find a need for a slight increase (.05v to .1v on AMD Platform)
HT Voltage – usually auto is fine for a 4.0GHz
NB Voltage – usually auto is fine for 4.0GHz if you have a BE CPU. Non BE CPU’s may require additional volts as this is for the chipset which may need an increase when going past 260MHz CPU Bus Freq. (stock is 1.11, max around 1.3v. I have seen this as high as 1.5v in extreme cases for long periods of time.
NB 1.8v – auto
CPU Spread Spectrum – Disabled for stability
PCIE Spread Spectrum – Disabled for stability
Be sure manually enter a value for both CPU Voltage and CPU/NB Voltage (not auto)
All other settings can stay at default or auto for most cases.
Originally Posted by alexan_e
I have a question related to the north bridge of CROSSHAIR IV FORMULA.
According to the board specs the RAM can be DDR3 2000(O.C.)/1800(O.C.)/1600(O.C.)/1333/1066 , what does this O.C. mean?
Does it mean that the NB works out of AMD specs but ASUS guarantees that is can work at that frequency?
Does the user need to change the default NB voltage and if so how are these considered officially supported is they can't be reached using default voltages?
On the other hand if default voltages can be used with that frequencies why do I see many owners of this board that have changed the NB voltage (in the owner table in the fist page)?
a. The O.C. means you'll need to raise the CPU Bus Freq (Ref Clock) to achieve the higher Dram Freq as AMD does not natively support the higher freq,s but the mobo does. Research or ask more ???'s if you don't know how the Ref Clock changes everything at once. There is a method to the madness. I'd be happy to share what I know.
b. The actual NB Voltage doesn't change a lot with simple OCing until you get close to 260-270MHz Ref Clock. I think you're referring to the NB Freq (not the NB). Yes the NB Freq will perform way above what AMD supports. Stock is 2000MHz, most Thubans can run 3000MHz and some of us run 3200+MHz. Just depends on your system.
c.OCing is not supported by the manufactures, but they do leave headroom for us that love to play.