Dell M820 owner manual Dimm

Processor 3	channel 0: memory sockets C1, C5, and C9
	channel 1: memory sockets C2, C6, and C10
	channel 2: memory sockets C3, C7, and C11
	channel 3: memory sockets C4, C8, and C12
Processor 4	channel 0: memory sockets D1, D5, and D9
	channel 1: memory sockets D2, D6, and D10
	channel 2: memory sockets D3, D7, and D11
	channel 3: memory sockets D4, D8, and D12

The following table shows the memory populations and operating frequencies for the supported configurations.

Processor	DIMM	DIMMs	Operating Frequency (in MT/s)		Maximum DIMM
Type	Type	Populated/			Rank/Channel
		Channel
			1.5 V	1.35 V
Intel Xeon	RDIMM	1	1600, 1333, 1066,	1333, 1066, and	Dual rank
Processor E5–			and 800	800
4600			1333, 1066, and	1066 and 800	Quad rank
			800
		2	1600, 1333, 1066,	1333, 1066, and	Dual rank
			and 800	800
			1066 and 800	1066 and 800	Quad rank
		3	1333, 1066, and	1066 and 800	Dual rank
			800
	LRDIMM	1	1333 and 1066	1333 and 1066	Quad rank
		2	1333 and 1066	1333 and 1066	Quad rank
		3	1066	1066	Quad rank
Intel Xeon	RDIMM	1	1866, 1600, 1333,	1600, 1333, 1066,	Dual rank
Processor E5–			1066, and 800	and 800
4600 v2			1333, 1066, and	1066 and 800	Quad rank
			800
		2	1866, 1600, 1333,	1600, 1333, 1066,	Dual rank
			1066, and 800	and 800
			1066 and 800	1066 and 800	Quad rank
		3	1333, 1066, and	1066 and 800	Dual rank
			800
	LRDIMM	1	1866 , 1600,	1600, 1333, and	Quad rank
			1333, and 1066	1066

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