Based on http://www.digikey.com/en/product-highlight/a/altera/cyclone-v-fpga-family , it says "Hard-memory controllers supporting 400 MHz DDR3 SDRAM with optional error correction code (ECC) support". Let say if I use DDR3 with 1866MHz speed grade. What frequency will it actually run at? What is the relationship between memory controller and DDR3 speed grade?
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