2.2 Performance

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The following table lists DDR3, DDR4, and LPDDR3 speeds.

Table 2-1. DDR Performance
Memory Type	I/O Type	Speed (-1)	Speed (STD)
DDR3	HSIO	1333	1067
DDR3	GPIO	1067	800
DDR4	HSIO	1600	1333
LPDDR3	HSIO	1333	800

Important: For DDR timing closure, use the SmartTime reports from Libero SoC.

The following table lists DDR3, DDR4, and LPDDR3 throughput.

Table 2-2. Throughput
Memory	Fabric Interface Frequency (MHz)	Fabric Interface  Data Width	DDR  Memory Data Width	Theoretical Throughput	Actual Throughput		Actual Throughput (%)
Memory	Fabric Interface Frequency (MHz)	Fabric Interface  Data Width	DDR  Memory Data Width	Max Throughput (MB/s)	Write (MB/s)	Read (MB/s)	Write (%)	Read (%)
DDR3	166.66	256	32	5344	4945.19	4987.06	92.5%	93.3%
DDR3 (AXI4)	166.66	256	32	5344	5338.89	4866.08	99.9%	91.2%
DDR4 (NI¹)	200	256	32	6400	5916.5	5866.9	92.4%	91.6%
DDR4 (AXI4)	200	256	32	6400	6395.9	5558.12	99.9%	86.84%
LPDDR3 (NI¹)	166.66	256	32	5344	5034.4	4917.6	94.2%	92%
LPDDR3 (AXI4)	166.66	256	32	5344	5340.59	4681.22	99.9%	87.5%

Note:

NI refers to native interface.
To get high DDR4 throughput, set tCCD_L to 4 on the Memory Timing tab of the PF_DDR4 Configurator.

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