all testing was done with 3 reference 970's (2 6-pin) with xspc waterblocks if it matters.
the best I could do Maxwell II bios editor guide.
1. Common tab
2.Voltage table tab
3.Power table tab
4.Boost table tab
5.Boost states tab
6.Clock states tab
let me start by saying that I am no professional. I have no affiliation with the creators of the Maxwell II bios editor or nvidia. From a technical standpoint I have no qualifications as to what I am talking about in this guide. Now with that out of the way I have been modifying my bios since the 660ti or kepler bios editor for thoes who arent firmiliar. I feel that i am qualified egnof to provide a guide explaining how you can go about doing so yourself instead of having to do what most everyone els has done. for example saying well F it lets see what happens and crossing your fingers or searching for hours through all 586 pages of a fourm hoping someone will talk about there experiences with l2c overclocking and syncing or whatever it is your trying to find out
First things first. you will need a Nvidia maxwell GPU. You should spent some time with this card with its bios in its factory state so you can get to know its behaviors. once you feel you have squeezed all you can out of your card you should set you max stable overclock and do the following.
wile under load take note of
1. the factory fan profile and the tempature associated with it
2. the gpu core voltage and clocks associated with it
3. perfcap reason using gpuz or similar
4.voltage limit, power limit, ov max limit in evga percision or similar. are they on
I will not be going over how to overclock your card or how to use software such as evga percision or afterburner i also will not be going over how to test your overclock for stability these are things you should know at this stage. If you are atempting to modifying your bios without this knowledge you are making a mistake.
BEFORE WE GET STARTED DO NOT USE THE SETTINGS IN PICTURERS BELOW. THEY MAY NOT WORK FOR YOU AND MAY NOT BE VALID .THEY ARE JUST A VISUAL REFERENCE
-Basic clock settings
1.TDP Base Entry, 3D base entry,boost entry in MHz : allow you to match you Base clock and Boost clock if you would like to do that but honestly I feel there is no need to change any of them for gaming purposes
2&3.TDP Base Clock and 3D Base clock in MHz : this number is your lowest gpu core clock wile in 3d. I also feel there is no need to change any of them for gaming purposes
4.Boost Clock in MHz : if you have followed this guide sofar you should know your max stable core overclock you should enter it in this box ( this may change by a small margin once we get to the Boost Table tab section 4)
5&6. Temp Target & max temp target : thies directly relate to your overclocking software temp target value
7&8. Boost Limit: somtimes locked by default (explanation in section 5) regulates maximum boost clock
9. Memory Clock: speed memory is running at in MHz. you should set this to you max stable memory overclock.
10. GPU Clock Offset + 13MHz.you can use this to increase your tdp,3d and base clocks in 13 step incriments. this button is not needed you should leave it alone.
-Fan Control (Experimental)
1. RPM 11,12,13: rpm of fan corosponding to settings 2 and 3 (below it). leave it alone unless you have an intimate relationship with your gpu fan and know its percentage to rpm ratio.
2. TMP 11,12,13: tempature in C corrosponding to settings 1 and 3 (above and below it). you can change thies to adjust your fan profile from the bios level
3. PER 11,12,13: power suplied to fan in percent. same recomendation as 1
4.PER01:minimum fan power in percent PER02:maximum fan power in percent best left alone unless you want quiet. Some users have reported errors if minimum is set below 20 this will depend on your card
4. RPM01, RPM02 same as above but in RPM same recomendation as 1
1. maximum gpu core voltage in mV. (1281.3=1.281v) getting this setting will take either some experimenting or some research. Some card makers hard lock this setting very low. also keep in mind the max the sensor will read is a max of 1.275v in software wile reading a max of 1.31v with a voltmeter at the card. however most cases 1.250v has been sufficient for 1500mhz core clocks. so research what your cards max hard limit is and move slider to that value to save many hours. if you have a reference 970 its 1.281v also if cpuz pops a vrel (baby blue) under perfcap reason you went to far and need to work your way down until vrel stops
2. overvoltage limit. directly relates to overclocking software. leave left alone and set right to max hard limit
3. external voltage regulator. set both sliders to max hard limit
4&5. min max voltage for different p-states leave left alone set right on all to max hard limit
6. CLK 01-74. Clock States. from CLK63-74 put left and right to max hard limit there will now be a large voltage gap between CLK62 and CLK63 so smooth it out going from CLK 63 setting each lower clock state 62, 61, 60, 59, 58.... and so on one voltage step lower until they match up. some reported crashes from having to steep of a voltage drop.
the very bottom slider with no label i was informed is the voltage for the memory i was also informed that it is hard locked and therfore not adjustable no mater how hard you try
3.Power Table Tab
a pci-e motherboard slot can provide 75watts (75000mW) MAXIMUM.
a 6pin and an 8pin can safely suply 150w (150000mW) with a high amp single rail psu but it is up to you what you feal safe with. (a 6 pin is rated at 75w and an 8 pin at 150w) but looking at the bios stock they are willing to exceed the rated spec
also this is were most bios differ from eachother. some have 8 sets of numbers and some 9 all bios list 6pin and 8pin even if its not on the card. this is one reason i use 150000 for 6 and 8 pin its just easier and causes no harm
being that there can be a different number of paramiters the easiest way to do this is to do the first 3 then the last 3 that way the remaining one will be a pci6 or 8 pin
1.TDP: Min(mW) : leave it alone Def(mW) & Max(mW) set to 300000.the card will never use this and it will clear the potential for a problem later
2. internal rail: nobody knows people have played with it. does nothing anybody is aware of. leave it alone.
3. pci-e motherboard slot Min(mW): leave it alone Max&Def(mW) set to 75000
ok the last 3
4.power target. this is how much you card is allowed to comsume in mW leave min alone
def should be 6pin+6pin+pci-e if you have 2 6-pins . total should not exceed max TDP(mW)
5.unknown dont touch.i did no result
6. unknown dont touch.i did no result
the boxes you have not touched yet are your pci-6 and 8 pin leave Min alone i set Def to 100000 and Max to 150000 but what you realy need to do is look at the percentages and match your pci-6 and 8 pin Def and Max percentages to your power target Def and Max percentages
4.Boost Table Tab
there is only one setting on this tab and what you should do with it is move the slider until 74 is the same or as close as possible rounding down to your max stable core overclock. make sure you go back to the common tab and that you match the Boost Clock box with the value you ended up with at 74.
5.Boost States Tab
GPC=core clock L2C= cache XBAR= crossbar SYS=system
i have done a good amount of testing with overclocking and matching GPC XBAR SYS and L2c my results are as follows
for every +100mhz to L2C SYS XBAR = +20 points in heaven extreme settings 4096x2160 and 100 points in fire strike 4k
for ever 50mhz core clock i saw the same gain
i saw no benifit from matching GPC to L2C XBAR and SYS i also found that not syncing L2C XBAR and SYS caused stutter
so match max L2C,XBAR and SYS and match GPC to max stable overclock
if you want to overclock L2C,XBAR and SYS you must do it slowly reflashing and testing until max stable overclock is found. take your time. higher numbers arent always better and can be slower so benchmark multiple times. save and compare results
any changes made to P00 must be made to P02 or you may experience crashing.
if gpc xbar l2c and sys all match it unlocks boost limit clock in common tab
6 Clock States tab
i have found no information on this and have not found the need to try fooling around in it for myself
and one more thing. I have found the easiest way to flash is disable drivers the drag your bios onto nvflash.exe I see a lot of people having issues but this has always worked for me once you run -protectoff
I would like to keep this thread free of bios downloads and requests for them this is about education and saving time thanks
and if anyone would like to educate me further I would love to do some testing then update the guide
Thanks for the guide, would be looking for one when I decide to mod my GTX 970 BIOS.
don't delay. mod away. the 970 bios is a real bottleneck especially when you start looking at factory overclock versions. I and others have found that the factory overclock versions lower the XBAR L2C and SYS to achieve the higher core clock
Good guide. Some formating needed but otherwise, awesome!
Great guide, will look into it
Have recently built a new rig with gtx 970 - ASUS GeForce GTX 970 4GB TURBO.
Have never bios mod before, so I feel a little shaky, but I guess thats the beauty of it, just baby steps and you will get there right
When I open my gm200 bios in the keppler editor and save it to make the hidden sliders appear I have no longer the fixed voltage tickbox?
With respect to the guide and it's warning that "if Gpuz pops a vrel (baby blue) under perfcap reason you went to far and need to work your way down until vrel stops"
This refers to the voltages in the voltage table right?
For my GTX 980Ti Amp Extreme I've noticed I needed to severely curtail the maximum voltage to 1243mV or
I get instantaneous Vrels.
Do Vrels directly cause throttling? Is there anyway to modify the VBIOS and raise or eliminate the Vrel limit?
What's the max core voltage on a Maxwell 2 GPU? Is it the same for 970's, 980's, 980Ti's and Titan X's?
One last question what's the difference between VOp and VRel? If you hit the VRel limit before the VOp limit or vice-versa what's the point of having both of them active?
Thanks for the Maxwell BIOS editing guide.
Thanks, interesting info about L2C, XBAR and SYS here. Worth to dig into this. Interesting also that the ref values here are all 1392.5
Will need to do some testing there.
I've had problems going too far w/the L2C value -- I had problems booting @ 1479 and persistent driver resets while working in Firefox w/GPU acceleration enabled. Because of this I now have my SYS and XBAR set to 1479 and my XBAR @ 1447.
Is it possible that if I dropped the XBAR/SYS/L2C values I could go higher on my GPU core clock? Would that be worthwhile? What clock domain is the SYS value controlling?
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