How important is clock speed in two cards that seem identical otherwise?

MVGNosrol

Prominent
Apr 28, 2017
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I'm thinking of buying a Gigabyte AORUS Radeon RX 570 or a Gigabyte Radeon RX 570. The two seem pretty much identical other than the clock speed and i'm wondering how much of an impact the 40mHz difference would make if they are otherwise the same.

GIGABYTE Radeon RX 570 DirectX 12 GV-RX570GAMING-4GD 4GB 256-Bit GDDR5 PCI Express 3.0 x16 ATX Video Card
https://www.newegg.ca/Product/Product.aspx?Item=N82E16814125966

GIGABYTE AORUS Radeon RX 570 DirectX 12 GV-RX570AORUS-4GD 4GB 256-Bit GDDR5 PCI Express 3.0 x16 ATX Video Card
https://www.newegg.ca/Product/Product.aspx?Item=N82E16814125965

https://www.newegg.ca/Product/Productcompare.aspx?CompareItemList=%2D1%7C14%2D125%2D965%5E14%2D125%2D965%2C14%2D125%2D966%5E14%2D125%2D966

Any help would be appreciated. Thanks.