Memory Recommendations

FPGA Memory Recommendations Using the ISE® Design Suite 14

Proper utilization of these tables requires understanding of the following:

The percentage of Slice/LUT utilization directly impacts the memory requirements. The numbers below assume devices with 75% LUT utilization.
1. For example, an XC4VLX100 which utilizes 50% of the LUTs will require 2 GB of RAM on a 32-bit Windows or Linux machine.
The number and complexity of timing constraints directly impact the memory requirements.

Spartan-3 Memory Recommendations in MB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC3S50	160	190	225	280	160	190	250	310
XC3S200	190	240	280	350	190	240	310	390
XC3S400	230	310	350	450	230	310	380	500
XC3S1000	350	490	510	710	350	490	570	790
XC3S1500	500	730	740	1060	500	730	820	1180
XC3S2000	700	1040	1030	1520	700	1040	1140	1680
XC3S4000	900	1340	1300	1960	900	1340	1460	2180
XC3S5000	1060	1590	1550	2320	1060	1590	1720	2580

Spartan-3E Memory Recommendations in MB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC3S100E	180	210	260	310	180	210	290	340
XC3S250E	220	270	320	400	220	270	360	440
XC3S500E	280	360	400	520	280	360	450	580
XC3S1200E	380	520	560	750	380	520	620	840
XC3S1600E	540	760	790	1110	540	760	880	1230

Spartan-3A Memory Recommendations in MB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC3S50A	200	220	290	330	200	220	320	360
XC3S200A	220	260	330	390	220	260	360	430
XC3S400A	270	330	400	490	270	330	440	540
XC3S700A	330	420	490	610	330	420	540	680
XC3S1400A	480	630	700	920	480	630	770	1020

Spartan-3A DSP Memory Recommendations in MB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC3SD1800A	680	680	990	1400	680	950	1100	1550
XC3SD3400A	880	1270	1290	1860	880	1270	1430	2060

Spartan-6 LX Memory Recommendations in MB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC6SLX4	200	300	500	600	200	300	500	600
XC6SLX16	300	500	600	900	300	500	600	900
XC6SLX45	500	900	1000	1500	500	900	1000	1500
XC6SLX150	1300	2300⁽²⁾	2200	3700	1300	2300⁽²⁾	2200	3700

Spartan-6 LXT Memory Recommendations in MB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC6SLX45T	500	900	1000	1500	500	900	1000	1500
XC6SLX150T	1300	2300⁽²⁾	2200	3700	1300	2300⁽²⁾	2200	3700

Virtex-4 LX Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC4VLX15	.4	.5	.6	.7	.4	.5	.6	.8
XC4VLX25	.5	.7	.8	1.1	.5	.7	.9	1.2
XC4VLX40	.7	1.1	1.1	1.6	.7	1.1	1.2	1.8
XC4VLX60	1.0	1.5	1.5	2.3	1.0	1.5	1.7	2.5
XC4VLX80	1.3	2.0	1.9	2.9	1.3	2.0	2.1	3.2
XC4VLX100	1.7	2.6⁽²⁾	2.5	3.9	1.7	2.6	2.8	4.3
XC4VLX160	N/A⁽¹⁾	N/A⁽¹⁾	3.4	5.2	N/A⁽¹⁾	N/A⁽¹⁾	3.8	5.8
XC4VLX200	N/A⁽¹⁾	N/A⁽¹⁾	4.4	6.8	N/A⁽¹⁾	N/A⁽¹⁾	4.9	7.5

Virtex-4 SX Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC4VSX25	.5	.7	.8	1.1	.5	.7	.9	1.2
XC4VSX35	.7	1.1	1.1	1.6	.7	1.1	1.2	1.8
XC4VSX55	1.0	1.5	1.5	2.25	1.0	1.5	1.7	2.5

Virtex-4 FX Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC4VFX12	.4	.5	.6	.7	.4	.5	.6	.8
XC4VFX20	.5	.7	.8	1.1	.5	.7	.9	1.2
XC4VFX40	.7	1.1	1.1	1.6	.7	1.1	1.2	1.8
XC4VFX60	1.0	1.5	1.5	2.2	1.0	1.5	1.6	2.4
XC4VFX100	1.7	2.6⁽²⁾	2.5	3.9	1.7	2.6	2.8	4.3
XC4VFX140	N/A⁽¹⁾	N/A⁽¹⁾	4.4	6.4	N/A⁽¹⁾	N/A⁽¹⁾	4.8	7.1

Virtex-5 LX Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC5VLX30	.6	.7	1.1	1.4	.6	.7	1.1	1.4
XC5VLX50	.7	.9	1.3	1.7	.7	.9	1.3	1.7
XC5VLX85	1.0	1.4	1.8	2.4	1.0	1.4	1.8	2.4
XC5VLX110	1.2	1.7	2.1	2.9	1.2	1.7	2.1	2.1
XC5VLX155	1.6	2.3⁽²⁾	2.7	3.8	1.6	2.3	2.7	3.8
XC5VLX220	N/A⁽¹⁾	N/A⁽¹⁾	3.5	5.1	N/A⁽¹⁾	N/A⁽¹⁾	3.5	5.1
XC5VLX330	N/A⁽¹⁾	N/A⁽¹⁾	4.8	7.3	N/A⁽¹⁾	N/A⁽¹⁾	4.8	7.3

Virtex-5 LXT Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC5VLX20T	.5	.6	1.0	1.1	.5	.6	1.0	1.1
XC5VLX30T	.6	.7	1.1	1.4	.6	.7	1.1	1.4
XC5VLX50T	.7	.9	1.3	1.7	.7	.9	1.3	1.7
XC5VLX85T	1.0	1.4	1.8	2.4	1.0	1.4	1.8	2.4
XC5VLX110T	1.2	1.7	2.1	2.9	1.2	1.7	2.1	2.9
XC5VLX155T	1.6	2.3⁽²⁾	2.7	3.8	1.6	2.3	2.7	3.8
XC5VLX220T	N/A⁽¹⁾	N/A⁽¹⁾	3.5	5.1	N/A⁽¹⁾	N/A⁽¹⁾	3.5	5.1
XC5VLX330T	N/A⁽¹⁾	N/A⁽¹⁾	4.8	7.3	N/A⁽¹⁾	N/A⁽¹⁾	4.8	7.3

Virtex-5 SXT Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC5VSX35T	.6	.8	1.2	1.4	.6	.8	1.2	1.4
XC5VSX50T	.8	1.0	1.4	1.8	.8	1.0	1.4	1.8
XC5VSX95T	1.1	1.5	1.9	2.6	1.1	1.5	1.9	2.6
XC5VSX240T	N/A⁽¹⁾	N/A⁽¹⁾	3.7	5.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	5.5

Virtex-5 TXT Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC5VTX150T	1.5	2.2⁽²⁾	2.6	3.7	1.5	2.2	2.6	3.7
XC5VTX240T	N/A⁽¹⁾	N/A⁽¹⁾	3.7	5.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	5.5

Virtex-5 FXT Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC5VFX30T	.6	.8	1.2	1.4	.6	.8	1.2	1.4
XC5VFX70T	.9	1.3	1.6	2.2	.9	1.3	1.6	2.2
XC5VFX100T	1.2	1.6	2.0	2.8	1.2	1.6	2.0	2.8
XC5VFX130T	1.4	2.0	2.4	3.4	1.4	2.0	2.4	3.4
XC5VFX200T	1.9	2.8⁽²⁾	3.2	4.7	1.9	2.8	3.2	4.7

Virtex-6/-6L LXT Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC6VLX75T	.9	1.5	1.6	2.5	.9	1.5	1.6	2.5
XC6VLX130T	1.3	2.2⁽²⁾	2.3	3.8	1.3	2.2	2.3	3.8
XC6VLX195T	N/A⁽¹⁾	N/A⁽¹⁾	3.1	5.5	N/A⁽¹⁾	N/A⁽¹⁾	3.1	5.5
XC6VLX240T	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5
XC6VLX365T	N/A⁽¹⁾	N/A⁽¹⁾	5.2	9.4	N/A⁽¹⁾	N/A⁽¹⁾	5.2	9.4
XC6VLX550T	N/A⁽¹⁾	N/A⁽¹⁾	7.5	13.7	N/A⁽¹⁾	N/A⁽¹⁾	7.5	13.7
XC6VLX760	N/A⁽¹⁾	N/A⁽¹⁾	10.1	18.7	N/A⁽¹⁾	N/A⁽¹⁾	10.1	18.7

Virtex-6 SXT Memory Recommendations in GB
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC6VSX315T	N/A⁽¹⁾	N/A⁽¹⁾	4.6	8.2	N/A⁽¹⁾	N/A⁽¹⁾	4.6	8.2
XC6VSX475T	N/A⁽¹⁾	N/A⁽¹⁾	6.6	12.0	N/A⁽¹⁾	N/A⁽¹⁾	6.6	12.0

Virtex-7/-7L T Memory Recommendations in GB for ISE
	Windows 64-bit		Linux 64-bit
Device	Typical	Peak	Typical	Peak
XC7V585T	9	14	9	14
XC7V1500T	18	24	18	24
XC7V2000T	24	32	24	32
XC7VX330T	6	9	6	9
XC7VX415T	7	11	7	11
XC7VX485T	7.5	12	7.5	12
XC7VX550T	8	12	8	12
XC7VX690T	10	15	10	15
XC7VX980T	14	18	14	18
XC7VX1140T	16	20	16	20
XC7VH290T	5	8	5	8
XC7VH580T	9	14	9	14
XC7VH870T	12	16	12	16

Kintex-7/-7L T Memory Recommendations in GB for ISE
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC7K70T	0.9	1.5	1.6	2.5	0.9	1.5	1.6	2.5
XC7K160T	1.8	2.9⁽²⁾	2.9	3.8	1.8	2.9⁽²⁾	2.9	3.8
XC7K325T	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5
XC7K355T	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5
XC7K410T	N/A⁽¹⁾	N/A⁽¹⁾	7	11	N/A⁽¹⁾	N/A⁽¹⁾	7	11
XC7K420T	N/A⁽¹⁾	N/A⁽¹⁾	7	11	N/A⁽¹⁾	N/A⁽¹⁾	7	11
XC7K480T	N/A⁽¹⁾	N/A⁽¹⁾	7.5	12	N/A⁽¹⁾	N/A⁽¹⁾	7.5	12

Artix-7/-7L T Memory Recommendations in GB for ISE
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC7A100T	1	1.5	1.6	2.5	1	1.5	1.6	2.5
XC7A200T	N/A⁽¹⁾	N/A⁽¹⁾	3.2	5	N/A⁽¹⁾	N/A⁽¹⁾	3.2	5
XC7A350T	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5

Zynq-7000 T Memory Recommendations in GB for ISE
	Windows				Linux
	32-Bit		64-Bit		32-Bit		64-Bit
Device	Typical	Peak	Typical	Peak	Typical	Peak	Typical	Peak
XC7Z010	0.8	1.4	1.5	2.4	0.8	1.4	1.5	2.4
XC7Z020	1.2	1.7	1.9	2.8	1.2	1.7	1.9	2.8
XC7Z030	1.7	2.8	2.7	4	1.7	2.8	2.7	4
XC7Z045	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5	N/A⁽¹⁾	N/A⁽¹⁾	3.7	6.5

Notes:

32-bit machines are not suitable for these devices.
Configuration of a Windows 32-bit machine to utilize 3 GB of memory can be found in Answer Record 14932.