Notification Center slow, red flash, general slowness and screen flickering

Hi!
I'm experiencing strange bugs since several days on my MacPro.
When opening the Notification Center, the background of the center flashes red, and it opens very jerky and slowly. Sometimes it just closes again.
In general the computer is slowed down, when watching flash video for example, and screen flickering and tearing occurs when scrolling trough folders or webpages.
Has anyone experienced this before? I'm kind of suspecting the graphics card for the screen tearing, but the dehaviour of the notification center surprises me.
Best,
Paul
Specs
Hardware Overview:
Model Name:          Mac Pro
Model Identifier:          MacPro3,1
Processor Name:          Quad-Core Intel Xeon
Processor Speed:          2,8 GHz
Number of Processors:          2
Total Number of Cores:          8
L2 Cache (per Processor):          12 MB
Memory:          20 GB
ATI Radeon HD 2600 XT:
Chipset Model:          ATI Radeon HD 2600
Type:          GPU
Bus:          PCIe
Slot:          Slot-1
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          ATI (0x1002)
Device ID:          0x9588
Revision ID:          0x0000
ROM Revision:          113-B1480A-252
EFI Driver Version:          01.00.252
ATI Radeon HD 2600 XT:
Chipset Model:          ATI Radeon HD 2600
Type:          GPU
Bus:          PCIe
Slot:          Slot-2
PCIe Lane Width:          x16
VRAM (Total):          256 MB
Vendor:          ATI (0x1002)
Device ID:          0x9588
Revision ID:          0x0000
ROM Revision:          113-B1480A-252
EFI Driver Version:          01.00.252

No matter what else about your system: dump the 2600s
Throw in a Samsung 840 SSD system boot drive
Move your user data to its own drive(s)
Keep your current system for backups.
Do that and should be fine. A Safe Boot or two, booting off an emergency Mac boot drive or clone of your system to run maintenance and repairs - especially if you have not. And backup sets, clone of every volume, and Time Machine set(s).

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No I didn't. The first time i explained the problem thoroughly and thought that they just couldn't miss such a visual error. I was wrong. The second time the technician wasn't there so i showed the above clip to the salesstaff and explained everything onceagain. Later the technician called me and we talked for 10min.
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Notification Center slow, red flash, general slowness and screen flickering

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