GT 640 Gddr5 or GT 730 ddr3?

Jul 26, 2018
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Hi, i ([strike]am brazilian and here i[/strike]) have these 2 options in same price range: GT 640 1Gb Gddr5 from Gigabite and the GT 730 1Gb ddr3 from PNY. The PNY one is Pcie 2.0 x8 version. Which one should I buy? Pls help, thanks!

P.S.: My desktop is a Lenovo M58p sff, 280w psu. The gt 1030 Gddr5 cost the twice of gt 730 here, and my monitor use VGA port.