Intel i486 SX25

View previous objectAm486 SX2/66 | i486 SX2/50View next object

A 25MHz 80486 SX processor. Not very fast but it's not the slowest 486 ever made. This one runs 5MHz faster which is noticeably in applications. The SX25 could be overclocked to 33MHz quite often without any hassle. 8MHz may not sound much but will greatly improve the speed of the system. Especially as the front-side-bus (FSB) goes up to 33MHz as well. In case the system is equipped with a Vesa Local Bus (VLB) graphics card the VLB bus goes up to 33MHz as well. In my opinion this is quite an ideal situation for a PC as the processor can ship it's data to the rest of the system as fast as possible because everything runs at the same speed.

The 486 had several improvements over the 386DX. Except for the SX versions it featured an internal co-processor. Both the SX and DX versions had internal cache, branch prediction and a five-stage pipeline. The internal cache (8KB) functions as a buffer for small data. Because the cache is inside the processor it can be accessed with higher speeds compared to the normal RAM. With branch prediction the processor will think in advance and get everything ready for the coming instructions. Pipelining is something that every modern CPU uses. See it as extinguishing a fire: without pipelining you have to fill a bucket of water, walk to the fire and dispose the water. With pipelining one fill the bucket, gives the bucket to the person standing next to him, he gives it to the person next to him and he gives it to the one that throws the water on the fire. This method of working will speed up the processor.

Specifications

Core / Codename
80486
Clockfrequency
25MHz
Front Side Bus
25MHz
Multiplier
1x
vCore
5V
L1 cache
8KB
L2 cache
None
sSpec
SX798
Chip date
9416
Stepping
?
Socket
PGA168
Transistor count
0.9M
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
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) 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
Post a comment or question as Anonymous user
Want your own account? Create one, it's free to register!
Insert reply
Your validation code is: 1337
Related
i486 SX33 (PGA168)
i486 SX33 (PGA168)
i486 SX25 (PGA168)
i486 SX25 (PQFP196)
i486 SX33 (PGA168)
i486SX