Please help... visual tearing problem

I have three monitors at home that all have screen refresh rate at 60Hz.
I know that usually when FPS surpasses or is higher than the screen refresh rate, then visual tearing occurs.
However, I found a very mysterious thing... when I was testing, my FPS was lower than 60, the same tearing occurred! The only way to solve this tearing is to use vertical sync.

My question is, usually when FPS is lower than the screen refresh rate, there shouldn't be visual tearing, but how come I still see tearing on my screen???

PS. I can't find the sub-category for monitor display... so I'll just put it in Graphics Cards... sorry.
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  1. When I enabled Vsync, I felt it's too smooth and somehow slow... I'm not used to it at all. Anyway, I just want to know how come my FPS is lower than screen refresh rate but tearing still occurs?

    System specification as follows:

    Windows 7
    CPU: Intel Core i5 2400
    Motherboard: ASRock Z68 Pro3 Gen3
    GPU: Asus AMD 7850
    Power Supply: GS600
    Hard Drive: Seagate SATA3 500GB

    Thank you very much!
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