Intel NG80386SX -20

Just like the 16MHz model but 4MHz faster.

This CPU has no sSpec number but does show 'C STEP'. This stands for C stepping.

In reality the 386SX20 is not much faster than a good (16MHz/20MHz) 286. However, the 386SX benefits from being able to run (32-bit) Windows 3.1 properly and to use memory managers like EMM386 which makes it a lot easier to free up conventional memory.

Also this chip is fitted on a motherboard with 16k cache. Quite unusual for a low-end 386 but it does increase performance. Another difference (depending on motherboard/chipset and memory speed) between 20MHz 286 and 20MHz 386SX's can be the memory wait-state. A system with 0 wait-state (NG80386SX -20 (OPTi82C/0WS) in the benchmarks) is a lot faster than the same system with 1WS.

CPU (chipset)	ChipTest RAM	score
NG80386SX -20 (OPTi82C/0WS)		9.50
Am386 DX40 (MX83)		8.09
i386 SX25 (WDC ISA)		6.50
NG80386SX -20 (F82C836 16k)		5.71
i386 DX25-IV (OPTi)		5.71
80286 -12-N (Suntac ST62C/0WS)		5.69
CS80C286 -20 (Hedaka/1WS)		4.50
V 30 (IBM 8530)		1.88
8086 -2 (IBM 8530)		0.92
8088 -1-P (ARC-88)		0.72
8088 D (ARC-88)		0.37
CPU (chipset)	DOSBench	score
Am5x86 -P75 (UMC PCI)		16295.00
Pentium 75 (430VX)		16147.00
Pentium Overdrive 83 (UMC PCI)		15764.00
Kingston TC5x86 /133 (UMC PCI)		15189.00
Am486 DX4/120 (UMC PCI)		15091.00
Cx5x86 100GP (UMC PCI)		15022.00
K5 PR133 (430VX)		14360.00
Cx486DX4 100GP4 (UMC PCI)		14159.00
K5 PR100 (430VX)		13836.00
Pentium 60 (Hendrixx)		13487.00
Am486 DX4/100 (UMC PCI)		12677.00
K5 PR90 (430VX)		12567.00
i486 DX4/100 (UMC PCI)		12256.00
80486 80MHz (UMC PCI)		11670.00
ST486DX2 80GS (UMC PCI)		11670.00
Cx486DX2 80GP (UMC PCI)		11670.00
5k86 P75 (430VX)		10355.00
Am486 DX2/80 (UMC PCI)		10241.00
TI486DX2 G66 (UMC PCI)		9765.00
Cx486DX2 66 (UMC PCI)		9674.00
80486 66MHz (UMC PCI)		9673.00
i486 DX2/66 (UMC PCI)		8727.00
Am486 DX2/66 (UMC PCI)		8613.00
i486 DX2/66 (UMC PCI)		8519.00
DX2ODPR 66 (UMC PCI)		8519.00
Am486 DX2/50 (UMC PCI)		6592.00
DX2ODP 50 (UMC PCI)		6590.00
ODP486SX 25 (UMC PCI)		6590.00
i486 DX2/50 (UMC PCI)		6590.00
i486 DX50 (UMC PCI)		6577.00
Cx486DX 40GP (UMC PCI)		5370.00
Cx486DRx2 33/66GP (UMC+Cx487)		5034.00
i486 DX33 (UMC PCI)		4425.00
Cx486DLC 33GP (ETEQ+387-40)		2698.00
Nx586 P90 (NxVLB)		1706.00
i386 DX25-IV (OPTi+387-40)		1451.00
Cx486DRx2 33/66GP (UMC)		706.00
i486 SX2/50 (UMC PCI)		632.00
Am386 DX33 (ETEQ+387-40)		567.00
i486 SX33 (UMC PCI)		424.00
V 20 (TurboXT+8087)		398.00
Cx486DLC 33GP (ETEQ)		357.00
V 20 (ARC-88+8087)		333.00
8088 -1-P (ARC-88+8087)		321.00
i486 SX25 (UMC PCI)		320.00
Am386 DX40 (MX83)		307.00
i486 SX20 (UMC PCI)		256.00
Am386 DX33 (ETEQ)		251.00
Am386 SX40 (ALi M1217)		200.00
Am386 SX33 (ALi M1217)		164.00
i386 DX25-IV (OPTi)		163.00
i386 SX25 (WDC ISA)		137.00
NG80386SX -20 (F82C836 16k)		136.00
NG80386SX -20 (OPTi82C/0WS)		117.00
CS80C286 -20 (Hedaka/1WS)		107.00
NG80386SX -16 (?)		92.00
80286 -12-N (Suntac ST62C/0WS)		80.00
R80286 8 (?)		43.00
CG80286 6 (IBM 512k)		32.00
V 30 (IBM 8530)		29.00
V 20 (TurboXT)		27.00
V 20 (ARC-88)		22.00
8086 -2 (IBM 8530)		18.00
8088 -1-P (ARC-88)		16.00
8088 D (ARC-88)		8.00
CPU (chipset)	Landmark 6	score
Am386 DX40 (MX83)		69.00
i386 DX25-IV (OPTi)		36.00
i386 SX25 (WDC ISA)		34.00
NG80386SX -20 (F82C836 16k)		30.00
CS80C286 -20 (Hedaka/1WS)		27.00
NG80386SX -20 (OPTi82C/0WS)		27.00
80286 -12-N (Suntac ST62C/0WS)		18.00
V 30 (IBM 8530)		7.47
8086 -2 (IBM 8530)		5.29
8088 -1-P (ARC-88)		5.09
8088 D (ARC-88)		2.44
CPU (chipset)	NSSI	score
Am386 DX40 (MX83)		11615.00
i386 DX25-IV (OPTi)		5855.00
NG80386SX -20 (F82C836 16k)		5436.00
i386 SX25 (WDC ISA)		5375.00
NG80386SX -20 (OPTi82C/0WS)		4839.00
CS80C286 -20 (Hedaka/1WS)		3860.00
80286 -12-N (Suntac ST62C/0WS)		3228.00
CPU (chipset)	PC-Tools	score
Am386 DX40 (MX83)		22.60
i386 DX25-IV (OPTi)		12.40
CS80C286 -20 (Hedaka/1WS)		10.30
i386 SX25 (WDC ISA)		10.30
NG80386SX -20 (F82C836 16k)		9.70
NG80386SX -20 (OPTi82C/0WS)		9.10
80286 -12-N (Suntac ST62C/0WS)		7.20
CPU (chipset)	Wolfenstein 3D CPU	score
Am386 DX40 (MX83)		30.00
i386 DX25-IV (OPTi)		19.00
NG80386SX -20 (F82C836 16k)		15.00
CS80C286 -20 (Hedaka/1WS)		13.00
NG80386SX -20 (OPTi82C/0WS)		13.00
80286 -12-N (Suntac ST62C/0WS)		10.00