Intel i486 SX2/50

An unusual processor. Most people either bought the SX33, DX33 or went for the DX2/66MHz. The DX2/66MHz usually gave the extra oomph compared to the 50MHz part and was worth the extra cash.

The SX2 doesn't have an integrated floating point unit (FPU) like any other 486SX CPU. Besides that it is exactly the same as the DX2.

To get a higher clock frequency the SX2 and DX2 use a technique called 'clock doubling'. This involves a multiplier that sets the clock frequency at twice the frequency of the front side bus (FSB). In this case a SX2/50 uses a 25MHz FSB and the CPU itself runs at twice the speed. The DX2/66 uses a 33MHz bus and weirdly enough the DX4/100 uses a 33MHz bus as well. Marketing-wise the name DX4 sounded better than DX3 but technically the DX4 is actually clock tripled like the non-existing DX3 would be.

Specifications

Core / Codename
Clockfrequency
50MHz
Front Side Bus
25MHz
Multiplier
2x
vCore
5V
L1 cache
8KB
L2 cache
None
sSpec
SX845
Chip date
9416
Stepping
?
Socket
Transistor count
0.9M?
Condition
CPU only
Engineering sample?
No

Benchmarks

CPU (chipset) dhry1od (Dhrystone) score
CPU (chipset) Doom score
CPU (chipset) DOSBench score
CPU (chipset) whetcod (Whetstone) score
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