[link|https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.7-21-inch-aluminum-late-2013-specs.html|EMC 2638 21.5” iMac 2.7 GHz Core i5 (2.7 GHz Core i5 (I5-4570R)] only offers the intergraded graphics engine (Intel Iris Pro 5200)
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[link|https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-21-inch-aluminum-late-2013-specs.html|EMC 2742 21.5” iMac 2.9 GHz Core i5 (I5-4570S)] offers a dedicated GPU chip (GeForce GT 750M) as well as the intergraded graphics engine (Intel HD Graphics 4600)
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[link|https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-21-inch-aluminum-late-2013-specs.html|EMC 2742 21.5” iMac 2.9 GHz Core i5 (I5-4570S)] offers a dedicated GPU chip (AMD GeForce GT 750M) as well as the intergraded graphics engine (Intel HD Graphics 4600)
[https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.7-21-inch-aluminum-late-2013-specs.html|EMC 2638 21.5” iMac 2.7 GHz Core i5 (2.7 GHz Core i5 (I5-4570R)] only offers the intergraded graphics engine (Intel Iris Pro 5200)
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[link|https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.7-21-inch-aluminum-late-2013-specs.html|EMC 2638 21.5” iMac 2.7 GHz Core i5 (2.7 GHz Core i5 (I5-4570R)] only offers the intergraded graphics engine (Intel Iris Pro 5200)
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[https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-21-inch-aluminum-late-2013-specs.html|EMC 2742 21.5” iMac 2.9 GHz Core i5 (I5-4570S)] offers a dedicated GPU chip (GeForce GT 750M) as well as the intergraded graphics engine (Intel Iris Pro 5200)
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[link|https://everymac.com/systems/apple/imac/specs/imac-core-i5-2.9-21-inch-aluminum-late-2013-specs.html|EMC 2742 21.5” iMac 2.9 GHz Core i5 (I5-4570S)] offers a dedicated GPU chip (GeForce GT 750M) as well as the intergraded graphics engine (Intel HD Graphics 4600)