Intel i386 DX25-IV

The 386 was the first CPU that could do real protected mode and could run in 32 bit mode. The 286 could switch to protected mode as well but not back to real modus without resetting the processor. It's successor can switch back without a reset. This allowed the programmers to create programs that could use the protected mode.

Because the 386 was fully 32 bits it was very expensive. This lead to the creation of the 386SX (the normal 386 was called DX) which was 32 bits internally but had a 16 bits bus. Practically the same story as with the 8086 and 8088 which was 16 bit internally and had a external 16 bits and 8 bits bus respectively. Also don't confuse the SX/DX-story of the 386 with the 486. Both the 486SX and DX were fully 32 bit but the SX part lacked a maths co-processor. If you wanted a co-processor for your 386 you had to buy an additional 387 processor and install it along with your 386DX or 386SX.

This 386DX/25 is fitted on a Shuttle HOT-386A motherboard without additional cache. The motherboard runs solid and has several unusual BIOS (They call it XCMOS) settings which are better left alone. I did set the memory to 0WS and enabled Fast Gate A20. Defaults are 1WS and that setting will hurt performance quite a bit (1FPS in Doom, 3.6FPS vs. 4.6).

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)	dhry1od (Dhrystone)	score
K6 233ANR (430VX)		399.40
MII 300GP/66x3.5 (430VX)		372.45
Pentium Pro 200 (440FX)		366.00
Pentium MMX 233 (430VX)		338.53
Pentium MMX 200 (430VX)		304.05
Winchip 2 233 (ALi Aladdin 5)		301.54
6x86MX PR233 (ALi Aladdin 5)		288.63
Pentium 200 (430VX)		283.25
6x86MX PR200 (ALi Aladdin 5)		265.49
Pentium MMX 166 (430VX)		262.81
Pentium 166 (430VX)		241.87
6x86 P200+ (430VX)		238.70
Winchip C6 200 (ALi Aladdin 5)		231.72
K6 166ALR (430VX)		224.30
K5 PR166 (430VX)		224.02
Pentium 150 (430VX)		221.30
6x86 PR166 (430VX)		211.29
Pentium 133 (430VX)		204.87
6x86 P150+ (430VX)		192.73
K5 PR133 (430VX)		191.51
Pentium 120 (430VX)		186.23
K5 PR100 (430VX)		172.80
Pentium 100 (430VX)		160.89
K5 PR90 (430VX)		157.82
Pentium 90 (430VX)		145.47
5k86 P75 (430VX)		129.54
Am5x86 -P75 (UMC PCI)		127.54
Pentium 75 (430VX)		120.14
Pentium Overdrive 83 (UMC PCI)		118.42
Am486 DX4/120 (UMC PCI)		116.90
Nx586 P90 (NxVLB)		103.90
Pentium 60 (Hendrixx)		96.98
Am486 DX4/100 (UMC PCI)		96.98
Cx5x86 100GP (UMC PCI)		92.55
Kingston TC5x86 /133 (UMC PCI)		76.01
Cx486DX4 100GP4 (UMC PCI)		75.26
i486 DX4/100 (UMC PCI)		72.13
Am486 DX2/80 (UMC PCI)		70.92
i486 DX2/66 (UMC PCI)		60.95
ST486DX2 80GS (UMC PCI)		59.71
80486 80MHz (UMC PCI)		59.71
Cx486DX2 80GP (UMC PCI)		59.71
i486 DX2/66 (UMC PCI)		59.23
DX2ODPR 66 (UMC PCI)		59.23
Am486 DX2/66 (UMC PCI)		58.66
i486 DX50 (UMC PCI)		50.59
Cx486DX2 66 (UMC PCI)		50.24
TI486DX2 G66 (UMC PCI)		50.24
80486 66MHz (UMC PCI)		50.24
Am486 DX2/50 (UMC PCI)		49.16
ODP486SX 25 (UMC PCI)		49.09
i486 SX2/50 (UMC PCI)		49.09
i486 DX2/50 (UMC PCI)		49.09
DX2ODP 50 (UMC PCI)		49.09
i486 SX33 (UMC PCI)		33.48
i486 DX33 (UMC PCI)		33.17
Cx486DX 40GP (UMC PCI)		30.15
Cx486DRx2 33/66GP (UMC+Cx487)		27.85
i486 SX25 (UMC PCI)		25.12
i486 SX20 (UMC PCI)		20.10
Am386 DX40 (MX83)		17.45
Cx486DLC 33GP (ETEQ)		17.45
Cx486DLC 33GP (ETEQ+387-40)		17.45
Am386 DX33 (ETEQ+387-40)		14.55
Am386 DX33 (ETEQ)		14.55
i386 DX25-IV (OPTi)		8.54
Am386 SX40 (ALi M1217)		8.28
Am386 SX33 (ALi M1217)		6.86
i386 SX25 (WDC ISA)		6.28
CPU (chipset)	Doom	score
MII 300GP/66x3.5 (430VX)		105.94
Pentium MMX 233 (430VX)		102.32
6x86MX PR233 (ALi Aladdin 5)		98.54
K6 233ANR (430VX)		98.41
Pentium MMX 200 (430VX)		97.63
Pentium 200 (430VX)		93.71
Pentium MMX 166 (430VX)		91.64
6x86 P200+ (430VX)		90.97
K6 166ALR (430VX)		90.53
6x86MX PR200 (ALi Aladdin 5)		90.31
Pentium 166 (430VX)		88.08
K5 PR166 (430VX)		86.55
Pentium Pro 200 (440FX)		84.68
6x86 PR166 (430VX)		84.21
K5 PR133 (430VX)		80.83
Pentium 150 (430VX)		80.57
Pentium 133 (430VX)		80.23
Winchip 2 233 (ALi Aladdin 5)		78.21
6x86 P150+ (430VX)		77.08
K5 PR100 (430VX)		76.14
Pentium 120 (430VX)		73.44
K5 PR90 (430VX)		69.74
Pentium 100 (430VX)		69.16
Winchip C6 200 (ALi Aladdin 5)		68.59
Pentium 90 (430VX)		63.35
5k86 P75 (430VX)		58.35
Pentium 75 (430VX)		53.05
Am5x86 -P75 (UMC PCI)		45.24
Pentium 60 (Hendrixx)		44.72
Pentium Overdrive 83 (UMC PCI)		43.60
Kingston TC5x86 /133 (UMC PCI)		41.98
Nx586 P90 (NxVLB)		41.03
Cx5x86 100GP (UMC PCI)		40.12
i486 DX4/100 (UMC PCI)		39.62
Am486 DX4/100 (UMC PCI)		38.88
Am486 DX4/120 (UMC PCI)		38.30
Cx486DX4 100GP4 (UMC PCI)		35.75
Am486 DX2/80 (UMC PCI)		32.22
i486 DX2/66 (UMC PCI)		31.37
i486 DX2/66 (UMC PCI)		31.12
DX2ODPR 66 (UMC PCI)		31.10
Am486 DX2/66 (UMC PCI)		30.85
80486 80MHz (UMC PCI)		30.09
Cx486DX2 80GP (UMC PCI)		30.07
ST486DX2 80GS (UMC PCI)		30.07
TI486DX2 G66 (UMC PCI)		27.59
Cx486DX2 66 (UMC PCI)		27.58
80486 66MHz (UMC PCI)		27.54
i486 DX50 (UMC PCI)		26.17
ODP486SX 25 (UMC PCI)		24.59
i486 DX2/50 (UMC PCI)		24.58
DX2ODP 50 (UMC PCI)		24.58
i486 SX2/50 (UMC PCI)		24.56
Am486 DX2/50 (UMC PCI)		24.34
i486 SX33 (UMC PCI)		18.30
i486 DX33 (UMC PCI)		18.30
Cx486DX 40GP (UMC PCI)		17.86
i486 SX25 (UMC PCI)		14.06
Cx486DRx2 33/66GP (UMC+Cx487)		13.60
i486 SX20 (UMC PCI)		11.24
Am386 DX40 (MX83)		8.24
Cx486DLC 33GP (ETEQ)		7.86
Cx486DLC 33GP (ETEQ+387-40)		7.86
Am386 DX33 (ETEQ)		7.47
Am386 DX33 (ETEQ+387-40)		6.89
Am386 SX40 (ALi M1217)		4.68
i386 DX25-IV (OPTi+387-40)		4.60
i386 DX25-IV (OPTi)		4.58
Am386 SX33 (ALi M1217)		3.86
i386 SX25 (WDC ISA)		3.40
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)	Quake	score
Celeron 300A (i440BX)		67.80
Pentium II 266 (i440BX)		64.10
Celeron 300 (i440BX)		61.70
Pentium II 233 (i440BX)		57.00
Celeron 266 (i440BX)		52.30
Pentium Pro 200 (440FX)		49.80
Pentium MMX 233 (430VX)		47.70
K6 266AFR (ALi Aladdin 5)		44.60
Pentium MMX 200 (430VX)		44.30
Winchip 2 233 (ALi Aladdin 5)		41.60
Pentium 200 (430VX)		41.40
Pentium MMX 166 (430VX)		39.80
K6 233ANR (430VX)		38.20
Pentium 166 (430VX)		37.30
K6 166ALR (430VX)		34.70
MII 300GP/66x3.5 (430VX)		34.40
Pentium 150 (430VX)		33.90
Pentium 133 (430VX)		32.70
Pentium 120 (430VX)		29.80
6x86MX PR233 (ALi Aladdin 5)		29.50
6x86MX PR200 (ALi Aladdin 5)		27.40
Pentium 100 (430VX)		26.70
Winchip C6 200 (ALi Aladdin 5)		26.70
K5 PR166 (430VX)		24.40
Pentium 90 (430VX)		24.30
K5 PR133 (430VX)		22.90
6x86 P200+ (430VX)		22.90
6x86 PR166 (430VX)		21.40
K5 PR100 (430VX)		20.40
Pentium 75 (430VX)		20.00
6x86 P150+ (430VX)		19.50
K5 PR90 (430VX)		18.50
Pentium Overdrive 83 (UMC PCI)		16.20
Pentium 60 (Hendrixx)		15.90
5k86 P75 (430VX)		15.40
Am5x86 -P75 (UMC PCI)		11.80
Kingston TC5x86 /133 (UMC PCI)		11.10
Am486 DX4/120 (UMC PCI)		10.30
Cx5x86 100GP (UMC PCI)		10.00
i486 DX4/100 (UMC PCI)		9.80
Am486 DX4/100 (UMC PCI)		9.10
Am486 DX2/80 (UMC PCI)		7.90
Cx486DX4 100GP4 (UMC PCI)		7.80
i486 DX2/66 (UMC PCI)		6.90
i486 DX2/66 (UMC PCI)		6.90
DX2ODPR 66 (UMC PCI)		6.90
Am486 DX2/66 (UMC PCI)		6.80
ST486DX2 80GS (UMC PCI)		6.60
Cx486DX2 80GP (UMC PCI)		6.60
80486 80MHz (UMC PCI)		6.60
TI486DX2 G66 (UMC PCI)		5.60
Cx486DX2 66 (UMC PCI)		5.60
80486 66MHz (UMC PCI)		5.60
i486 DX2/50 (UMC PCI)		5.50
ODP486SX 25 (UMC PCI)		5.50
DX2ODP 50 (UMC PCI)		5.50
i486 DX50 (UMC PCI)		5.50
Am486 DX2/50 (UMC PCI)		5.40
i486 DX33 (UMC PCI)		3.70
Cx486DX 40GP (UMC PCI)		3.70
Cx486DRx2 33/66GP (UMC+Cx487)		2.50
Cx486DLC 33GP (ETEQ+387-40)		1.30
Am386 DX33 (ETEQ+387-40)		1.20
i386 DX25-IV (OPTi+387-40)		0.90
CPU (chipset)	whetcod (Whetstone)	score
Pentium Pro 200 (440FX)		162.00
Pentium MMX 233 (430VX)		156.34
K6 233ANR (430VX)		145.81
Pentium MMX 200 (430VX)		133.97
Pentium 200 (430VX)		132.63
Pentium MMX 166 (430VX)		111.78
Pentium 166 (430VX)		110.62
MII 300GP/66x3.5 (430VX)		109.85
Pentium 150 (430VX)		100.70
K6 166ALR (430VX)		89.44
Pentium 133 (430VX)		88.46
6x86MX PR233 (ALi Aladdin 5)		88.07
Winchip 2 233 (ALi Aladdin 5)		88.07
Pentium 120 (430VX)		80.57
6x86MX PR200 (ALi Aladdin 5)		78.54
6x86 P200+ (430VX)		67.34
Pentium 100 (430VX)		66.40
Pentium 90 (430VX)		60.51
6x86 PR166 (430VX)		59.82
Pentium Overdrive 83 (UMC PCI)		55.05
6x86 P150+ (430VX)		54.47
Pentium 75 (430VX)		49.84
Winchip C6 200 (ALi Aladdin 5)		41.11
Pentium 60 (Hendrixx)		39.89
K5 PR166 (430VX)		37.79
Cx5x86 100GP (UMC PCI)		37.60
Kingston TC5x86 /133 (UMC PCI)		33.58
Am5x86 -P75 (UMC PCI)		33.57
K5 PR133 (430VX)		32.38
K5 PR100 (430VX)		30.99
Cx486DX4 100GP4 (UMC PCI)		30.95
Am486 DX4/120 (UMC PCI)		30.22
K5 PR90 (430VX)		28.21
i486 DX4/100 (UMC PCI)		26.16
Am486 DX4/100 (UMC PCI)		25.18
ST486DX2 80GS (UMC PCI)		24.77
80486 80MHz (UMC PCI)		24.77
Cx486DX2 80GP (UMC PCI)		24.77
5k86 P75 (430VX)		23.23
80486 66MHz (UMC PCI)		20.64
Cx486DX2 66 (UMC PCI)		20.63
TI486DX2 G66 (UMC PCI)		20.63
Am486 DX2/80 (UMC PCI)		20.14
i486 DX2/66 (UMC PCI)		16.91
i486 DX2/66 (UMC PCI)		16.91
DX2ODPR 66 (UMC PCI)		16.90
Am486 DX2/66 (UMC PCI)		16.77
Cx486DX 40GP (UMC PCI)		13.13
i486 DX2/50 (UMC PCI)		12.68
ODP486SX 25 (UMC PCI)		12.68
i486 DX50 (UMC PCI)		12.68
DX2ODP 50 (UMC PCI)		12.68
Am486 DX2/50 (UMC PCI)		12.57
i486 DX33 (UMC PCI)		8.38
Cx486DRx2 33/66GP (UMC+Cx487)		6.79
Cx486DLC 33GP (ETEQ+387-40)		3.73
Am386 DX33 (ETEQ+387-40)		3.38
i386 DX25-IV (OPTi+387-40)		2.51
Nx586 P90 (NxVLB)		0.54
i486 SX2/50 (UMC PCI)		0.33
i486 SX33 (UMC PCI)		0.23
Cx486DRx2 33/66GP (UMC)		0.21
i486 SX25 (UMC PCI)		0.17
Cx486DLC 33GP (ETEQ)		0.15
Am386 DX40 (MX83)		0.14
i486 SX20 (UMC PCI)		0.14
Am386 DX33 (ETEQ)		0.12
Am386 SX40 (ALi M1217)		0.09
Am386 SX33 (ALi M1217)		0.07
i386 DX25-IV (OPTi)		0.06
i386 SX25 (WDC ISA)		0.06
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