Front Side Bus
The Duron will be running on the same bus, at the same speed of it’s
bigger brother, the AMD Athlon.  The EV6 bus runs at 100MHz, but it
transfers 2 bits per clock cycle, one on the rising, and one on the
falling edge of the clock, therefore giving it an effective
200MHz.  The Celeron will be running on the
same bus as it’s bigger brother, the Pentium iii, but at half the speed. 
Take a look at the following equations and see how much bandwidth there
is between the CPU and the rest of the system.
Duron:
100MHz * 64bits wide * 2 bits per cycle = 1.56GB/s
Celeron
66MHz * 64bits wide * 1 bit per cycle = 528MB/s
The Duron, therefore has a little over THREE TIMES the bandwidth
to the rest of the system than the Celeron.  Talk about total blow
out…

Advantage: Duron

MMX
Both processors contain MMX, which is a must for a successful
processor today.
Advantage: Draw

SIMD Instructions
Each CPU boasts it’s company’s own special 3D instructions. 
Because it is virtually impossible to test 3D instructions alone, a
winner can not be decided on performance.  And, because both
instructions can’t be decided on support, because almost all major games
now support SSE and 3D Now!, a winner can’t be decided.
Advantage: Draw

Overall, the L2 Cache isn’t a major factor. It’s the Overall Cache, and the
HUGE Front Side Bus Bandwidth the Duron Possesses. Tests from around the internet
have shown that the Duron is almost as fast as a Pentium iii at the same clock speed.
Needless to Say, it blows the socks off of the Celeron. There really is not contest
when the Celeron and the Duron are up against one another, the Duron wins, hands down.

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