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Message: <blockquote data-quote="drothgery" data-source="post: 2077698" data-attributes="member: 360">There are three different Celerons available right now (well, four, but two are quite similar). There's the Northwood-based Celeron (no suffix), which is an awful chip, because it's got too little cache for the Pentium 4 architecture, but these are dropping out of circulation fairly quickly because Celeron D chips (see below) are cheaper for Intel to make.  There's the Prescott-based Celeron D, which is a halfway decent budget chip, because a Pentium 4 with 256K cache isn't all that cache-starved. And then there's the Celeron M, which is, in fact, a Pentium M with half the cache, and plugs into the same motherboard as a Pentium M. Here's Intel's spec sheet: <a href="http://www.intel.com/products/notebook/processors/celeron_m/" target="_blank">http://www.intel.com/products/notebook/processors/celeron_m/</a>Err.. the P4 wins when memory bandwidth or SIMD instructions make a big difference (MMX, SSE, SSE2). The P-M's better at x87 floating point, but anything that really needs floating point should be optimized to use SSE2 instead of x87.Also, with an 800 MHz FSB and dual-channel DDR400 (or DDR2-533) the P4 has far better memory bandwidth than all but the newest Pentium M notebooks. The P-M has a 400 MHz FSB or 533 MHz FSB (only in new designs with the Sonoma chipset). The just-launched-this month Sonoma chipset has dual-channel DDR2-533 support, but the previous, and still much more widely-used Carmel chipset only supports single-channel DDR 333. The Pentium M has more cache than all P4s except for the just-launched P4 6xx series and the hyper-expensive P4 Extreme Edition, and has a very slick cache design, which helps mask the lack of memory bandwidth, but it's not entirely successful.</blockquote>

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