gpu and mb for i5 6500

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In that price range, you might be able to get a Radeon RX460. Otherwise, a GTX 750Ti or GTX 950 are good choices.

Motherboard choice doesn't matter much. Pick one with the slots you want. As long as it's from a good brand (Asus, ASRock, MSI, Gigabyte), more expensive boards will not have any impact on performance or stability, they'll just have more connections and ports on them.
In that price range, you might be able to get a Radeon RX460. Otherwise, a GTX 750Ti or GTX 950 are good choices.

Motherboard choice doesn't matter much. Pick one with the slots you want. As long as it's from a good brand (Asus, ASRock, MSI, Gigabyte), more expensive boards will not have any impact on performance or stability, they'll just have more connections and ports on them.
 
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