- --b, --backend backend
- By default NVClock uses its so called 'low-level' backend for
reading and adjusting the clockspeeds of cards. Since NVidia driver
1.0-7667 the drivers also provide an overclocking mechanism called
'Coolbits'. It is only supported on desktop versions of the
GeforceFX/6/7. The main advantages it has over the low-level
backend is that it allows you to set the clocks to use in 2D and 3D
programs. The problem is that various modern GeforceFX/6/7 cards
run at different clockspeeds depending if you are running a 3D
application or not.
Possible values for backend are: coolbits, coolbits2d,
coolbits3d and lowlevel. The default option on GeforceFX/6/7 cards
is coolbits which sets the same clocks for 2D/3D, further
coolbits2d and coolbits3d set respectively the 2D and 3D clocks and
finally lowlevel lets you use the lowlevel backend.
- -c, --card number
- Most systems only contain only one videocard. On systems with
multiple cards, this option can be used to select the card to
overclock.
- -d, --debug
- Enable/Disable overclocking related debug info. This
information shows the data stored in the PLLs during various
operations.
- -D, --Debug
- Print a long list of GPU registers containing their current
value. All this info is very usefull for debugging.
- -f, --force
- Force support for a card that is currently disabled. Cards can
be disabled by default if the code for them is experimental or in
case a Laptop is being used. Laptops are disabled for safety
reasons as overclocking on them is more dangerous. In case you know
what you are doing you can use this option to enable downclocking
of your GPU as a way to save power.
- -F, --fanspeed speed
- Using this option you can adjust the duty cycle of the
fanspeed. The value you can enter should lie between 10% and 100%.
A low duty cycle correspons to a low fanspeed.
Note that the duty cycle is NOT the fanspeed. The duty cycle
controls the percentage of time in a fixed time interval in which
the fan is 'on'. By choosing a higher value the fan is enabled a
larger part of the time which results in a higher fanspeed.
Changing the duty cycle from 20% to 40% doesn't double the noise or
fanspeed.
- -i, --info
- Print detailed card info
- -m, --memclk speed
- Memory speed in MHz
- -n, --nvclk speed
- Core speed in MHz
- -P, --Punit mask
- The Geforce6/7 are designed in such a way that one single GPU
can be used for creating different types of boards. For instance
they produce a NV40 (6800-class) GPU and when the GPU is
functioning properly they turn it into a 6800GT/Ultra or when
something is damaged or when it can't reach high clocks they call
it a 6800NU/LE. The same is the case for NV43 based 6200/6600
cards. A 6800LE card ships with 8 disabled pixel units and 2
disabled vertex units. On various cards it is possible to re-enable
those units and if it works correctly it can greatly improve 3D
performance. The problem is that some units can be broken which
results in artifacts or instability. Further not all GPU models can
be unlocked either because Nvidia protected the GPUs against
modding or because there are no extra units to enable.
Using this option you can enable extra pixel units. First check
using the -i switch which pixel units are masked. If none are
masked it means that none can be unlocked. For an explanation I
will take a 6800LE as an example which by default has 8 of its 16
pixel units disabled. The -i option showed the mask '1100' which
means that the first and second block of pixel units are disabled.
One block of pixel unit contains 4 pipelines in case of most boards
with the exception of NV44/NV46 which use 2 pipelines for each
pixel unit. To enable the first and second pipeline use -P 1111
(binary) or i you prefer hex 0xf. NVClock will then try to unlock
the pipelines note that even when there are masked pipelines some
can be locked in hardware so that they can't be enabled.
- -r, --reset
- Restore the original clockspeeds
- -s, --speeds
- Print current clockspeeds in MHz
- -S, --smartdimmer
- For use on laptops Nvidia added functionality called
smartdimmer which can be used to adjust the brightness of the
backlight. At the moment the feature is limited to Geforce6200Go
cards but if needed more cards can be added if they really provide
Smartdimmer support. To use this option just select a value between
15% and 100% and it should work fine.
- -V, --Vunit mask
- This option can be used to enable disabled vertex pipelines
which can appear on Geforce6/7 cards. For an introduction to
pipeline modding check the -P option first. The syntax and working
option is the same as the pixel unit one with the difference that
one bit corresponds to 1 vertex pipeline instead of multiple. Again
check -i to see which vertex units are locked. On a 6800LE you
might see '001111' which means that the fifth and sixth unit are
locked. To enable all units use -V 111111 (binary) or 0x3f (hex).
Note that it isn't certain that a unit can be enabled as on some
cards units are locked.
- Below is a list with Display / OpenGL related options
- -l, --list
- List OpenGL / Display options supported by your chipset/driver
- -q, --query option
- Query current setting for one of the options listed under
OpenGL / Display options.
- -a, --assign option / option[display]=value
- Set a value for a supported option.
For OpenGL options like fsaa the following syntax is enough:
nvclock -a option=value
Display specific options like Digital Vibrance sometimes
need the display name: nvclock -a vibrance[crt-0]=value.
- -x, --xdisplay
- Choose another X display
- -h, --help
- Show summary of options.