dissable vertical sync, how?

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Level 1

2 points

dissable vertical sync, how?

Hi

Does anyone know if you can disable vertical sync for the new Mac Pro graphics cards on OS X (I have the cheapo 7300)?

For pro graphics this has a big impact on perfromance on PC cards, the Nvidia control panel has an option to turn it on or off or have it application controlled (you'll get a very different score in say Cinebench with it off).

So how do you do that in OS X (a terminal command?) the cards and drivers are practically the same as PC versions AFAIK??

G5 DP 1.8 (+Mac Pro) Mac OS X (10.4.7)

Posted on Aug 21, 2006 3:27 AM

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Answer 1

Top-ranking reply

Arnoud Helmantel

Level 1

45 points

Aug 21, 2006 2:03 PM in response to simon_D

You could try this:

- download the Developer Tools for OSX (why wasn't this included with the Pro?)
- install it
- go to /Developer/Applications/Performance Tools
- open Quartz Debug
- go to Tools -> Show Beam Sync Tools
- select Disable Beam Synchronization

After this any application that starts up should have a little more breathing space...

You need to force-quit the QD app (or minimize it for the rest of the login session). Quitting it will re-enable the feature.

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Answer 2

3dluvr

Level 1

50 points

Aug 23, 2006 11:44 AM in response to simon_D

type: sudo defaults write /Library/Preferences/com.apple.windowserver Compositor -dict deferredUpdates 0
replace 0 with 1 to re-enable

...or try this tool: http://crazypigeon.com/QuartzSimple.dmg

..or check this page: http://www.macosxhints.com/article.php?story=20050622224239730

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Answer 3

simon_D Author

Level 1

2 points

Aug 22, 2006 3:04 AM in response to Arnoud Helmantel

Thanks, I'll try this - sounds like what I need!

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Answer 4

simon_D Author

Level 1

2 points

Sep 1, 2006 3:08 AM in response to 3dluvr

thanks for the info, that's useful.

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