hˈaɪɚ pɚfˈoːɹməns hˈɑːɹdwɛɹ sˈʌtʃ ɐz ɡɹˈæfɪks kˈɑːɹdz jˈuːs dˌiːˌɛmˈeɪ tʊ ˈæksɛs mˈɛmɚɹi dᵻɹˈɛktli; ɪn ɐ vˈɜːtʃuːəl ɛnvˈaɪɹənmənt ˈɔːl mˈɛmɚɹi ɐdɹˈɛsᵻz ɑːɹ ɹˌiːmˈæpt baɪ ðə vˈɜːtʃuːəl məʃˈiːn sˈɔftwɛɹ, wˌɪtʃ kˈɔːzᵻz dˌiːˌɛmˈeɪ dɪvˈaɪsᵻz tə fˈeɪl.
Higher performance hardware such as graphics cards use DMA to access memory directly; in a virtual environment all memory addresses are re-mapped by the virtual machine software, which causes DMA devices to fail.