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Amazon.com: ASRock B450M PRO4 AM4 AMD Promontory B450 SATA 6Gb/s USB 3.1 HDMI Micro ATX AMD Motherboard : Electronics
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CMS 32GB (2X16GB) DDR4 19200 2400MHZ Non ECC DIMM Memory Ram Upgrade Compatible with Asrock® Motherboard B365M Pro4, B450 Pro4, B450M Steel Legend, B450M-HDV, H370M Pro4 - C114 at Amazon.com
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There are two PCI-E 16x slots on ASRock B450M Pro4 motherboard. Which one is PCI-E 16x 3.0 and which one is PCI-E 16x 2.0 slot? - Quora
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Amazon.com: Asrock B450 PRO4 R2.0 AM4 AMD Promontory B450 SATA 6Gbps ATX AMD Motherboard : Electronics
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