Radeon 7950 Mac edition on MacPro 3,1 early 2008 OS X Mavericks

Reporting Radeon 7950 Mac edition in MacPro 3,1 working fine.
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Plain Mavericks, no drivers installed (Sapphire or others.)
No glitch, no flicker, no lag, no hang to report after over 40hrs.  400hrs. of use.
--- Update (May)
I do get the occasional "flicker" reported by other users, on single monitor config, odd.
It's more like a "zap" though. It really happens rarely, but I noticed it up to three times on a single day while working in FCPX.
It's very short, less than a second and I didn't notice it before with two monitors attached.
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Graphic card working well with FCPX, Motion, and Adobe CC suite (Premiere, AE, PS, AME.) 
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Radeon 7950 3GB Mac edition
MacPro 3,1 early 2008
Quad Core Intel Xeon 2.8GHz
16GB Ram
OS X Mavericks 10.9.2 (upgraded from 10.9.1 clean install.)