Flickering with 5970

Hello and welcome to the forums  
If by flickering you mean some lines appearing in 2D mode,then yes i have the same problems too(sometimes),its said that Cat 10.4 will completely take care of this problem and for now,you can raise the 2D clock to 400/900(default is 157/300) and for me it worked,here is how:
1_Open CCC and choose Overdrive tab,unlock the settings(by clicking on the " Gold Key" icon)
2_Go top options,profile and choose profile manager.
3_In the composition tab,choose "The following settings" and in the "ATI Radeon HD 5900 series"make sure only ATI overdrive is checked.
Then enter a profile name,then save and close it(Do not activate).
4_Go to C:\Users\Your UserName\AppData\Local\ATI\ACE\Profiles (Its hidden so make sure you unlock hidden files and folders)
5_Open the profile with wordpad and do this edits:
<Feature name="CoreClockTarget_0">
<Property name="Want_0" value="40000" /> (default is 15700)

<Feature name="MemoryClockTarget_0">
<Property name="Want_0" value="90000" /> (default is 30000)

and for the second card:

<Feature name="CoreClockTarget_1">
<Property name="Want_0" value="40000" />

<Feature name="MemoryClockTarget_1">
<Property name="Want_0" value="90000" />

Save the changes and close.

6_Open CCC,in options tab go to profiles,profile manager and choose the profile that you saved before and then click on Activate and close.

thank you

No problem  
Did it solve the issue ?