# 10 bit DAC's **URL:** \ **Category:** Uncategorized\ **Created:** [August 30, 2005, 8:30pm UTC](https://psychtoolbox.discourse.group/t/10-bit-dac-39-s/1543 "2005-08-30T20:30:36Z")\ **Posts on this page:** 1\ **Page:** 1
**Author:** ![Allen\_Ingling](https://avatars.discourse-cdn.com/v4/letter/a/a183cd/32.png) [@Allen\_Ingling](https://psychtoolbox.discourse.group/u/Allen_Ingling)\ **Post date:** [August 30, 2005, 8:30pm UTC](https://psychtoolbox.discourse.group/t/10-bit-dac-39-s/1543/1 "2005-08-30T20:30:36Z")
I recently tried to get 10-bit color display accuracy using an ATI 7000 video card and OS 10.2 on a Mac G5. I set the values in the gamma table ranging from 0.0 to 1.0 in 1024 linear steps while measuring the screen output with a photometer and the results did not show 10 bit accuracy(more like 8 bit accuracy). I then switched to a NVidia GeForce FX5200 video card. The results were different but still not 10-bit accuracy. Has anyone actually had measurable 10 bit accuracy with a video card that has 10 bit DAC's?