Performance-wise, the Celeron certainly needed the clock speed boost to bring it up to par. The 1GHz Duron absolutely crushed the 900MHz Celeron in our last round of tests. Let's dive into the strange world of value processors and see how the performance picture looks today.
The value processor equation
Value processors are an interesting anomaly that has shown up in the market over the past few years. Back in the day, we used to just buy CPUs off the lower end of the clock-speed scale in order to save a buck. Alternatively, we'd just buy a high-end 486 instead of a Pentium, or whatever the flavors of the day were. Thanks to the emergence of sub-$1K computers and the like, Intel saw a need to differentiate their high-end products from their low-end products a little more clearly. The Celeronand thus the "value processor" segmentwas born.
Intel and AMD have employed a couple of tricks in order to keep the value processors from nibbling into the market shares of their older siblings. That's important, because the chips are based on the exact same technology as those siblingsthe Duron is a modified Athlon, and the current Celeron is a modified Pentium III. Among those tricks:
Of course, this strategy hasn't always worked well; to this day, I have two Celeron "300A" processors (rated at 300MHz) running at 504MHz in a dual-processor system. Generally, if big brother can run at a given range of clock speeds, little brother probably can, too. So we overclockers like to keep an eye on the value segment, because we sometimes find hidden treasure there.
For instance, we've already explored how the new Durons, at 1GHz and above, are based on a revised version of the Athlon, code-named Palomino. The "Palomino" Athlons aren't available on the desktop quite yet, but their Duron counterparts, code-named Morgan, are. The "Morgan" Durons have a number of enhancements that increase their clock-for-clock performance, including logic that preemptively fetches data into the L2 cache and support for Intel's SSE multimedia extensions. In our last round of tests, the 1GHz Duron ran neck-and-neck with a 1GHz Athlon that lacks these enhancements.
So all we can say with certainty is that buying a 900MHz Duron instead of a 1.1GHz Athlon is kind of like buying an 800MHz Athlon instead of a 1.1GHz Athlon. The price and performance differences may be similar, but they won't be exactly the same. In this weird world of mutant processors intentionally engineered to run slower, that's about as good as we can do.
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