Dell R720XD owner manual Removing Memory Modules

System	DIMM Size (in	Number of	DIMM Rank,	DIMM Slot Population
Capacity (in	GB)	DIMMs	Organization, and
GB)			Frequency
160	8	20	2R, x4, 1333 MT/s	A1, A2, A3, A4, A5, A6, A7, A8, A9,
				A11
				B1, B2, B3, B4, B5, B6, B7, B8, B9,
				B11
	16 and 8	12	2R, x4, 1333 MT/s,	A1, A2, A3, A4, A5, A6,
			2R, x4, 1600 MT/s	B1, B2, B3, B4, B5, B6
				NOTE: 16 GB DIMMs must be
				installed in slots numbered A1,
				A2, A3, A4, B1, B2, B3, and B4
				and 8 GB DIMMs must be
				installed in slots A5, A6, B5,
				and B6.
192	8	24	2R, x4, 1333 MT/s	A1, A2, A3, A4, A5, A6, A7, A8, A9,
				A10, A11, A12
				B1, B2, B3, B4, B5, B6, B7, B8, B9,
				B10, B11, B12
	16	12	2R, x4, 1333 MT/s,	A1, A2, A3, A4, A5, A6
			2R, x4, 1600 MT/s	B1, B2, B3, B4, B5, B6
256	16	16	2R, x4, 1333 MT/s,	A1, A2, A3, A4, A5, A6, A7, A8
			2R, x4, 1600 MT/s,	B1, B2, B3, B4, B5, B6, B7, B8
384	16	24	2R, x4, 1333 MT/s	A1, A2, A3, A4, A5, A6, A7, A8, A9,
				A10, A11, A12
				B1, B2, B3, B4, B5, B6, B7, B8, B9,
				B10, B11, B12
	32	12	4R, x4, 1333 MT/s	A1, A2, A3, A4, A5, A6
				B1, B2, B3, B4, B5, B6
512	32	16	4R, x4, 1066 MT/s	A1, A2, A3, A4, A5, A6, A7, A8
			4R, x4, 1333 MT/s	B1, B2, B3, B4, B5, B6, B7, B8
768	32	24	LRDIMM, x4, 1333 MT/s	A1, A2, A3, A4, A5, A6, A7, A8, A9,
				A10, A11, A12
				B1, B2, B3, B4, B5, B6, B7, B8, B9,
				B10, B11, B12
1536	64	24	LRDIMM, x4, 1333 MT/s	A1, A2, A3, A4, A5, A6, A7, A8, A9,
				A10, A11, A12

B1, B2, B3, B4, B5, B6, B7, B8, B9,

B10, B11, B12

Removing Memory Modules

WARNING: The memory modules are hot to the touch for some time after the system has been powered down. Allow time for the memory modules to cool before handling them. Handle the memory modules by the card edges and avoid touching the components or metallic contacts on the memory module.

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