Overclock / underclock tool for AMD Radeon HD graphic cards on MS Windows. Lets you change core clock, memory clock and voltage on multiple cards from the command line.

Features

• Change core clock from very low values up to BIOS limit = CCC limit (e.g. stock Sapphire HD5850 Xtreme: 159-900Mhz*). Benefit: Increased Hashrate. It is not possible to overclock or overvolt higher than with catalyst control center!
• Change memory clock from very low value up to BIOS limit (e.g. stock Sapphire HD5850 Xtreme: 159-1250Mhz*). Benefit: Lower power dissipation, thus lower temperatures in turn allowing significantly higher core clock.*
• Reduce core voltage*. Benefit: Lower power dissipation.
• Will preserve your warranty unlike modifying the BIOS which may void it.
• Works with multiple cards.
• Fan control.
• PowerTune support
• Data logging
• JSON output
• Temperature limit and idle watching.

* The 6xxx and 7xxx cards may be limited tightly - read the infos and FAQ in the forum thread before buying!

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Update patches
(have to be applied in order)
If you did not clean out your cookies the link above should let you download the latest version, too.

Update patch from v0.9.1b to v0.9.2b: clocktweak_update_v0.9.1b-v0.9.2b.exe

Update patch from v0.9.0b to v0.9.1b: clocktweak_update_v0.9.0b-v0.9.1b.exe

Update patch from v0.8.0b to v0.9.0b: clocktweak_update_v0.8.0b-v0.9.0b.exe
Latest example batch file: example_revB.bat

Update patch from v0.7.4b to v0.8.0b: clocktweak_update_v0.7.4b-v0.8.0b.exe

Update patch from v0.7.3b to v0.7.4b: clocktweak_update_v0.7.3b-v0.7.4b.exe

Update patch from v0.7b to v0.7.3b: clocktweak_update_to_v0.7.3b.exe


Revision History
v0.9.2b (2011-08-29)
Small change concerning undervolting.

v0.9.1b (2011-07-27)
Slightly different clock setting approach, should work better for 6xxx cards.
Added hidden voltlevel option - see the readme.
Minor fixes.

v0.9.0b (2011-07-05)
Lots of new features. Some small fixes.
- Added PowerTune support.
- Data logging.
- JSON output.
- Temperature and idle limit watching.
- Hidden options to change core and mem clock levels 0 and 1 - see the readme.

v0.8.0b (2011-06-20)
Added fan speed control and an option to suppress headers for logging.

v0.7.4b (2011-06-02)
more aggressive memory downclocking

v0.7.3b (2011-05-30)
added support for multi gpu cards like HD 5970 and HD 6990

v0.7b (2011-05-26)
initial release

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