Intel i486 DX50

Both the Am486DX40 and Cx486DX40 were tricky on early motherboards because of their high bus speed. Think again and look at this 50MHz part that requires a 50MHz front side bus. 50MHz sounds like it will fly but unfortunately it doesn't.

My UMC PCI motherboard automatically sets the PCI bus on 25MHz (1/2 of the FSB) when running a 50MHz FSB. This is because the PCI slots are rated to run at 33MHz and the next step would be 37,5MHz (1/3 of the FSB). This affects performance of the cards that are installed, especially the graphics card. With a 25MHz PCI bus Doom 1.9S will score 24.91 FPS. The same benchmark with 37,5MHz PCI bus gets 26.17 FPS. All the benchmarks run by this CPU shown below are done with a 37,5MHz PCI bus.

Notice that the DX50 isn't much faster than the DX2/50, even though it runs at twice the bus speed (50MHz over 25MHz)! Only Doom seems to run a bit better but that's because the graphics card can be accessed faster over the 37,5MHz PCI bus.

Specifications

Core / Codename
Clockfrequency
50MHz
Front Side Bus
50MHz
Multiplier
1x
vCore
5V
L1 cache
8KB
L2 cache
None
sSpec
SX710
Chip date
9250
Stepping
?
Socket
Transistor count
1.2M
Condition
CPU only
Engineering sample?
No

Benchmarks

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
DX20ODPR 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
DX20ODPR 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
Pentium 100 (430VX)
21577.00
Pentium 90 (430VX)
19734.00
K5 PR166 (430VX)
16460.00
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
ST486DX2 80GS (UMC PCI)
11670.00
80486 80MHz (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
DX20ODPR 66 (UMC PCI)
8519.00
i486 DX2/66 (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 (?+8087)
333.00
8088 -1-P (?+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 (?)
22.00
8086 -2 (IBM 8530)
18.00
8088 -1-P (?)
16.00
8088 D (?)
8.00
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
DX20ODPR 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
DX20ODPR 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
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