Do I need a motherboard with SATA 3gb/s or 6gb/s?

Hi, I am looking to build a PC. I would like to use it to play some games such as Call of Duty, Flight Simulator X, Minecraft.. and use it as a computer in generally for word processing, music etc.
I would like to use the AMD Bulldozer Quad Core 4100 or an i5-2500k as a CPU and get a nVidia 550 Ti for a GPU. But I do not know what to get for a motherboard yet. I was looking at this one:
it looks like it would work but the SATA is 3gb/s so I looked for a 6GB/s one and I found this:

Would I see a difference?

And can you overclock with these motherboards?

And which CPU out of those 2 would be best for me?
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More about motherboard sata
  1. Not much difference in speed with an ssd; with a conventional hardrive, you won't even notice it. If you're stretched on your budget, get a low end z77 board for overclocking, or z75 if you don't. Both come with sata 6 gb/s support on all the boards. You won't have to pay extra for it.
  2. Welcome to Tom's Forum! :)

    First you need to decide on Intel or AMD and next if using any Sandy Bridge (K) you'll need an LGA 1155 with either P67, Z68 or Z77 chipets to Overclock (OC) the CPU.

    Both the ASRock H61M/U3S3 & Gigabyte GA-H61M-S2PV use the H61 chipset and will not allow the CPU to OC.

    Next, if you're adding an SSD or ever will then I would recommend a SATA3 (6Gb/s) ports. GPU - 550 Ti is fine for CoD, and the games you listed -- BF3 you'll have to choose Details or lower resolution.
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