["This for Extra Slim (XS-D) v2.5 board provides 128MB of SDR SDRAM memory for cores requiring a large (>512KB) of memory including the Neo Geo core. Although the DE10-Nano has built in DDR3 RA for M, it has a high latency and is not suitable for the timings required of retro EDO DRAM. So if a core requires precise memory timings, then the onboard DDR3 cannot be used.Every one of my boards uses the high quality Alliance memory paired 。You can be confident knowing each 128MB SDRAM for Extra Slim (XS-D) v2.5 board has been tested for over an hour at 140 MHz . I have also tested each with the Neo Geo console core, Acorn Archimedes (Archie) core, for Game Boy Advance core, core and in Neo Geo games which require a 128MB module to for play this ensures no issues are present.\n\nFeature：\n~Suitable For Terasic DE10-Nano FPGA Board\n~128MB SDRAM Capacity\n~ Of The Neo Geo ROM Library Playable\n~Alliance Memory AS4C32M16SB-7TIN Chips\n~MiSTer IO Board Compatible\n~Fully Assembled & Tested\n\nPackage include:\n- 1 x for Extra Slim (XS-D) v2.5 SDRAM Board"]