Choppy playback after upgrading hardware

I've recently upgraded from a phenom 965 and 7gb 1333 gb ram, to an i5-2500k with 16gb 1600mhz. Otherwise everything is the same, i just reinstalled windows and premiere pro after the upgrade. After the upgrade this error, or annoyance, occured. Here's all the specifics:
-Premiere pro CS5.5.2 v/latest updates
-Windows 7 pro (fresh install v/important updates)
-h.264 in mp4-container
-no error messages
-very choppy playback after "jogging". When theres a lot of movement, the picture becomes very "stuttery" and "pixelated" in that area.
-no extra codecs or similar is installed.
- hardware:
-nvidia gtx 560 v/latest drivers
-i5 2500k @ 4,6Ghz
-16Gb 1600mhz xmp ram
-7200rpm 500gb source hdd
-5200rpm 120gb scratch disk
-Agility 120gb ssd OS and programs
I have tried using 1/4 playback, using ssd as scratch disk, installing and uninstalling extra codecs but none of it made any difference. The cpu or ram never exceeds 50% capacity when the problems occur.

But wouldnt the cpu reach 100% capacity before it starts being the bottleneck?
Only if all the other components supply data fast enough that the CPU can run flat out. If the CPU has to wait for other components to catch up, CPU load will be less than 100%.
If you race alone on a track and there are no other contestants (components) in the race, you can go flat out at 100% of the speed, but if the track is filled with many other contestants (components) from a local old-age house, your speed will drop significantly.

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On Sat, Nov 8, 2014 at 1:31 PM, Kevin Monahan <[email protected]>

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