mˈɛmɚɹi kəntɹˈoʊlɚz bˈʌs wˈɪtθs ɹˈeɪndʒ fɹʌm ˈeɪtbˈɪt ɪn ˈɜːlɪɚ sˈɪstəmz, tə fˈaɪvhˈʌndɹɪd twˈɛlvbˈɪt ɪn mˈoːɹ kˈɑːmplᵻkˌeɪɾᵻd sˈɪstəmz ænd vˈɪdɪoʊ kˈɑːɹdz tˈɪpɪkli ˈɪmplɪməntᵻd æz fˈoːɹ sˈɪksti fˈoːɹbˈɪt sˌaɪməltˈeɪniəs mˈɛmɚɹi kəntɹˈoʊlɚz ˈɑːpɚɹˌeɪɾɪŋ ɪn pˈæɹəlˌɛl, ðˌoʊ sˌʌm ɑːɹ dɪzˈaɪnd tʊ ˈɑːpɚɹˌeɪt ˈɪn "ɡˈæŋ mˈoʊd" wˌɛɹ tˈuː sˈɪksti fˈoːɹbˈɪt mˈɛmɚɹi kəntɹˈoʊlɚz kæn biː jˈuːzd tʊ ˈæksɛs ɐ wˈʌnhˈʌndɹɪd twˈɛnti ˈeɪtbˈɪt mˈɛmɚɹi dɪvˈaɪs.
Memory controllers' bus widths range from 8-bit in earlier systems, to 512-bit in more complicated systems and video cards (typically implemented as four 64-bit simultaneous memory controllers operating in parallel, though some are designed to operate in "gang mode" where two 64-bit memory controllers can be used to access a 128-bit memory device).