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Does bus speed have to match?

I'm planning to get a AMD FX8350 which can get to 5200mt/s but i have a GIGABYTE GA-970A-D3 motherboard which has 4800mt/s... does that even matter? Will it bottleneck or is it perfectly fine?
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    It will bottleneck, but that is a minor amount. You would also need to saturate the bus to hit that ceiling. Which may happen in memory intensive applications.

    This is common amongst AM2/AM2+/AM3/AM3+ systems. While cross compatible you are limited by the memory and PCI-E bus the board supports.

    That chip isn't on the supported CPU list, though it does support the FX8300 which is also rated at 5200mt/s, so you should definitely get the latest BIOS before making the attempt.
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