Method for i used OC it....
1. I run ATITool 0.27beta4 and go to setting page you'll see BUS:3,Dev:0 = GPU1 default clock show 411/450MHz and BUS:4, Dev:0 = GPU2 default clock show 825/901MHz... so select GPU2(BUS:4, Dev:0)
2. back to main page ATITool and you'll see on profile is show Default(825/901) so click "LOAD" and after click GPUZ will show 825/901MHz on card-2 but in clock bar ATITool will show 411/450MHz you don't interested it
3. For OC card type clock number in overclock-bar as 900/950 and enter... so after enter you'll see in GPUZ will show clock same you type in card-2
4. Close ATITool and run AMD GPU clocktool, see on device - BN:3, DN:0 = GPU1 and BN:4, DN:0 = GPU2... you'll see GPU1 run on default clock(825/900) but GPU2 will run same on you setting by ATITool 900/950(891/945 real)
5. Now you can overclock all GPU by AMD GPU clocktool and gpu clock will same both speed
btw. i'm not confirm this method will success on everyoneand not sure is really clock same both GPU
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