[CentOS] sata drives and controlers

I intend to replace fading SCSI drive by a SATA one. 
The motherboard is PCI and no SATA controller on board.
So I need a SATA/PCI  controller.

Is there something wrong to do this kind of switch?
Some told me that I won't be able to boot that drive.
Loosing part of the SATA interface speed is not a decisive factor on this machine
Is there are  some prefered Linux SATA controller?

Need experienced feedbacks.

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Michel Donais
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