i download nvclock from slackbuilds, build, and install.
slackware64 14.1, alien multilibs, nvidia GT630 rev 2 ( gk208), and nvidia 331.38 driver xfce.

try to run nvclock_gtk from root in terminal session - it says "(nvclock_gtk:1371): Gtk-WARNING **: cannot open display: :0"
ok. try the same from user - it says "Segmentation fault"

too ok - i know, there is cli client
but when i do
nvclock -s
( get speed info) from root terminal - my computer completely lock up - even network connection. i press reset, and boot again.
then try
nvclock -i
(info) - and get exactly the same outcome - completely lockup. again "reset". not want experimenting that way further, because afraid, i can got problems with my filesystems / raid1 in that way. anyone have an ideas, or experience with nvclock novadays?

I'd stay away from this kind of thing anyway, as I don't want to burn by video card. My

if you not change voltage, and cards temperature is in good range, there is no real danger, imho. 10 - 15 percent overclock novadays is normal thing, i suppose. sadly, but nvidia on linux drivers is locked overclock feature ( in past you can write option coolbits = 1 in xorg.conf, and can overclock memory and gpu from nvidia-settings apps. now that is disabled, sadly. from win you can overclock your cards, from linux - not.

If really you're a hard gamer, better buy a GTX690. Here (Paris, France) you can buy one for (a little) less than 1,000 €, VAT included

More seriously, are you sure that with 10 15 percent overclock you will notice the difference?

affraid, my gamer's days is in past
but i suppose, if my videocard can crunch a bit faster boinc scientific projects with no additional costs from me, it is not a bad thing
and 1000 eur is very high sum for me. there, in 3rd european countries, salary is no better than in nigeria, i think. maybe even worse...

I understand now, c'est pour la bonne cause.

I can't help you at the moment because I don't use the nvidia driver, but I suggest you contact the maintainer of the slackbuid. You'll find his email address in this page.

ok, already writed to maintainer.
the thing of a less possibilities under linux, than under win also not a good, imho.
but ok, see, what happens

there is overclocking in the official driver

add
Option "Coolbits" "1"
to "Device" section of xorg.conf

i think nvclock needs it to work also

it not work anymore. looks like nvidia disable that in linux drivers:

http://www.phoronix.com/forums/showt...x-driver-found

mhm
i got nv92 and the latest drivers
guess it is only fermi and above, didn't know

I maintain nvclock, but haven't actually used it in years. The last update for it was almost 5 years ago so at this point I don't even know if it works for modern video cards.