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Possible HDD micro stutter issue

Hi all. I'm hoping somebody with a bit more technical understanding than myself can help me clarify the issue.

I have recently upgraded my ram and HDD in my PC. I used to have 6GB of PNY DDR3 ram and a crappy 320gb HDD connected via SATA 1 cable. This HDD was the only original component in the PC since I first bought it, as everything has been improved upon over time.

I now have 16GB Kingston HyperX DDR3 1600MHz ram and a WD 1TB 3.5" SATA III 6Gb/s Caviar Black 7200rpm 64mb cache HDD.

Since upgrading I have been encountering micro stutters - literally only about one second long. Everything freezes and the sound stutters, sometimes making a "zzzztttt" sound. Then it just catches up. Sometimes games have been minimizing to desktop when it happens, but not always.

I have tried quite a few fixes such as upgrading all drivers, reverting to old drivers, checking temps, changing ram voltage. But it seems like this may be related to the new HDD.

I have put the old 320gb HDD back in and although it is noticeably slower compared to the new one, I haven't had any micro stutters yet after an hour of testing on various games with other programs running in the background.

Specs:

Geforce 660ti
i5 2500k 3.30ghz
16GB Kingston HyperX Genesis DDR3 1600MHz
ASRock P67 Pro3 SE Mobo
WD 1TB 3.5" SATA III 6Gb/s Caviar Black 7200rpm 64mb cache HDD
Windows 7 Home Premium

It has to either be the ram or the hdd that's causing the problem, as I didn't have this issue before I upgraded them.

Does anybody know why the new HDD would be causing this to happen? It seems like a vast improvement in terms of speed and yet it's seemingly causing these stutters.

Any suggestions or help would be gratefully received.

Thanks.

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