PCI Express x16 vs x4 , Any difference in gpu performance ? HD

Pcie 4x slot vs pcie 16x slot (version 3.0) Will it impact gpu performance when inserted in low bandwidth x4 slot ? 12 games benchmarked. Test system details: pciex16 vs pciex4 Intel i5 8400 3.8GHz all core turbo cock speed Msi Z370 A-Pro motherboard supported - pci express 3.0 x16 & x4 asus strix rx 580 8gb OC edition gpu hyper x predator 3200 mhz 2x8 gb , 3200 mhz duall Channel 2tb , 500 gb 7200 rpm ssd - samsung 960 evo, samsung 850 evo Dell u2515h (tested at 1920 * 1080 resolution) Windows 10 build - latest update Latest drivers used for AMD GPU/chipset while testing. vmreviews vmreview80@gmail.com