slot z97 ✓ 2 out 4 memory slots are not working on a Gigabyte Z97 board

slot z97 Expansion Slots · 2 x PCIe x1 ; Expansion Slots · 2 x PCI ; Storage, Intel Z97 chipset : ; Storage · 1 x SATA Express port, compatible with 2 x SATA Gbs ports slot z97 Intel Z97 rev 00 BIOS American Megatrends Inc 2601 Slot #1 Module SK Hynix 4096 MB - PN: HMT451U6AFR8A-PB

slot z97CPU Supports 4th and 5th Generation Intel® Core™ Processors, and Intel® Pentium® and Celeron® Processors for Socket LGA1150 · Chipset Intel® Z97 Express

slot z97 ASUS SABERTOOTH Z97 MARK 1 MOTHERBOARD UNBOXING! (GETTING VR READY