I want to use the HD as primary for a Windows 7 OS and I do play a lot of recent high-end games.
Is this WD HD too slow to use as a primary HD and for playing games because of it's low RPM(5400).
It's also the WD green series which means power efficient at the cost of performance. I like to know is this too slow for my needs.

I'm now planning to replace it with a seagate barracuda 7200.12 1TB drive, is that necessary or this WD HD enough for my use?

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All went well until I plugged the drive in.

buy samsung spinpoint f3 1tb

yup that ears is slow