From: GP <[EMAIL PROTECTED]>
Ini artikel tentang Duron >< Celeron dari
http://www.pcmech.com/article.htm?duron-vs-celeron2
Ini tidak bicara tentang efek overclocking dari Celeron/Duron.
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AMD takes yet again another slash at Intel's market share with it's newest
line of Processors to feature the K75 core. The AMD Duron will directly
compete with the Intel Celeron in the Value PC market, while the
Thunderbird will replace the current Athlon, and compete with the Pentium
iii Coppermine Processors. The Duron is basically one of the New AMD Athlon
Processors with the Thunderbird core, but with less L2 Cache, a lot less L2
Cache. Meanwhile, the Celeron II is basically a Pentium II, with SSE and
128KB of onboard L2 Cache. Don't think the Celeron II is basically a
Pentium iii with half the cache. That's just not true.
Being the Duron will directly compete with the Celeron, let's take a look
at the spec of each ship:
AMD Duron Intel
Celeron
Processing Core K75, Same as Athlon P6, Same as Pentium Pro,
Pentium
II,
and Pentium iii
L1 Cache 128KB (64/64) 32KB (16/16)
L2 Cache 64KB full speed on chip 128KB full speed on
chip
Front Side Bus 100Mhz DDR (200MHz) E6 66Mhz GTL+
MMX Yes Yes
SIMD Instr. Type 3D Now! SSE
Processing Core
Each processor shares the same type of processing core with it's bigger and
higher performing brothers. The Duron, which has the same abilities as the
Athlon, has 3 Fully pipelined Floating Point units. That means all 3
Floating Point Units can do the same things, at the same time, or they can
do different things. The important thing is that the Duron's FPU units all
work at the same time. On the other hand, the Celeron's three floating
point units can work at the same time as long as they are doing different
things. Once two or more of the pipelines want to use the same instruction
on data, the pipelines then work one at a time. So, if two units want to do
the same thing, one must stop and wait for the other to finish, then it can
begin again. A stopped pipeline means less number crunching, which means
lower FPS in those demanding 3D Games
Advantage: Duron
L1 Cache
The Duron sports 128KB of L1 Cache, split into 64KB Data and 64KB
Instruction segments while the Celeron only sports 32KB, a mere fourth of
the Duron. Advantage: Duron
L2 Cache
The Celeron processor has, ever since the 300A, had 128KB of L2 Cache
running on the die, meaning, at the speed of the CPU itself. AMD recently
moved the L2 Cache of all processors on the core. The only problem is the
Duron only has 64KB of L2 cache. Thankfully, the L2 cache is exclusive.
This means that the L1 Cache is not copied directly to the L2 cache, as it
is with the Celeron. If it were, we'd end up being 64KB in the hole, if
that's possible. Currently, all Intel processors have inclusive L2 caches,
meaning there is a mirror image of the L1 cache, inside the L2 cache,
decreasing the available amount of L2 cache that is usable in all systems.
With AMD's exclusive L2 Cache, it's almost like having 192KB of onboard
Cache (L1 + L2). But, even with the 32KB subtracted from the L2 cache for
the L1 mirror in the Celeron, it still has more L2 cache than the Duron.
Speed of the L2 Cache is another story. The latency, or the number of clock
cycles it takes for the CPU to find what it needs in the L2 cache, is a
measurement of speed in memory, such as Cache. The Latency of the Duron's
L2 Cache is "0", while the Latency of the Celeron's L2 is "2". That means
it takes two clock cycles for the Celeron to find stuff in the L2, while
the Duron will find what it needs on the first clock cycle. But, even
though the Duron's L2 is faster, the Celeron still has more, two times
more. A problem is encountered when taking TOTAL CACHE into mind. The Duron
has 192KB, while the Celeron sadly has only 128KB of usable cache.
Advantage in L2:Celeron
Advantage in Total Cache: Duron
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.
--
Garind P
=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=
"oc ur mobo not urself or anybody else"
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