nV News Forums - [270.18] Overclocking is _still_ broken for 8xxx (probably 9xxx too) class GPUs

nV News Forums (http://www.nvnews.net/vbulletin/index.php)

- NVIDIA Linux (http://www.nvnews.net/vbulletin/forumdisplay.php?f=14)

- - [270.18] Overclocking is _still_ broken for 8xxx (probably 9xxx too) class GPUs (http://www.nvnews.net/vbulletin/showthread.php?t=159167)

[270.18] Overclocking is _still_ broken for 8xxx (probably 9xxx too) class GPUs

Since 260.12.19 (a clear regression) overclocking on 8XXX class GPUs is broken. 270.18 beta drivers also have this problem.

Downclocking works well:

Code:

$ nvclock -m 200 -n 200

Requested memory clock:         200.000 MHz

Requested core clock:           200.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   200.000 MHz

GPU clock:      200.000 MHz

Now let's try to revert to the original clocks (650/900):

Code:

nvclock -r

Your nVidia Geforce 8800GT has been restored to its original clocks

Memory clock:   950.000 MHz

GPU clock:      200.000 MHz

NVIDIA driver doesn't restore GPU clock. However if I try to restore GPU clocks incrementally, it works:

Code:

[artem@localhost tmp]$ nvclock -n 300

Requested core clock:           300.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      200.000 MHz



[artem@localhost tmp]$ nvclock -n 250

Requested core clock:           250.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      250.000 MHz



[artem@localhost tmp]$ nvclock -n 330

Requested core clock:           330.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      250.000 MHz



[artem@localhost tmp]$ nvclock -n 300

Requested core clock:           300.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      300.000 MHz



[artem@localhost tmp]$ nvclock -n 400

Requested core clock:           400.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      300.000 MHz



[artem@localhost tmp]$ nvclock -n 350

Requested core clock:           350.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      350.000 MHz



[artem@localhost tmp]$ nvclock -n 400

Requested core clock:           400.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      400.000 MHz



[artem@localhost tmp]$ nvclock -n 500

Requested core clock:           500.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      500.000 MHz



[artem@localhost tmp]$ nvclock -n 650

Requested core clock:           650.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      500.000 MHz



[artem@localhost tmp]$ nvclock -n 600

Requested core clock:           600.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      600.000 MHz



[artem@localhost tmp]$ nvclock -n 650

Requested core clock:           650.000 MHz



Adjusted Coolbits 2D/3D clocks on a nVidia Geforce 8800GT

Memory clock:   950.000 MHz

GPU clock:      650.000 MHz

Aaron, zander, please reopen the internal ticket for this issue.