what is differnce between "dual core" and " core 2 duo" processors?
825320
A dual core processor is a CPU with two separate cores on the same die, each with its own cache. It's the equivalent of getting two microprocessors in one.\nDual core technology refers to two individual microprocessors on a single die cast chip. This is essentially two computer processing units (CPUs) in one. The advantage of a dual core chip is that tasks can be carried out in parallel streams, decreasing processing time. This is referred to as thread-level parallelism (TLP). \nTLP is also possible on motherboards that can accommodate two separate CPU dies. When TLP is accomplished in a single CPU through dual core technology, it is called chip-level multiprocessing (CLM). \nIn dual core CPUs, each microprocessor generally has its own on-board cache, known as Level 1 (L1) cache. L1 cache significantly improves system performance, because it is much faster to access on-chip cache than to use random access memory (RAM). L1 cache is accessed at microprocessor speeds.\nThe Intel® Core™2 Duo desktop processor delivers revolutionary dual-core performance and breakthrough processor energy efficiency.\nBased on the revolutionary Intel® Core™ Microarchitecture, the Intel Core 2 Duo processor has been developed for an increasingly multimedia-centered, high-definition world, and is designed to do more in less time.\nIntel Core 2 Duo processors operate at lower frequencies while producing higher performance compared to today’s higher frequency processors, thus enabling quieter and smaller desktop PCs
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Intel® Core™ Duo processor T2600\n65 nm 2MB L2 2.16 GHz 667 MHz 31W
313624
As far as I understand on a processor with HT the operating system would recognize it as two processors. (Ofcourse there are other design options, but this is the simplest choice and keeps the OS independent of the way the threads are scheduled).
802198
The simplest answer is Intel Core 2 Duo is definitely faster than Intel Core Duo.  In other words, Core Duo is the first version of Intels dual core processors(2 processors in one) and Core 2 Duo is the second version.  \n\nThe longer answer is that within the last few years, everyone has realized that core speed (such as the 3.4Ghz or 1.86Ghz you mentioned) are not the only thing that determine speed.  Think of it like this, imagine that there were two autos you were thinking of buying.  One is a huge truck with a big engine, maybe a 6 Liter engine.  The other is a small sports car with only a 3 Liter engine.  Even though the truck has the bigger engine, the sports car will actually be faster.  So if speed is what you are after (which is really the main reason to buy a processor) then you will buy the sports car.  \n\nBottom line, buy the Core 2 Duo.
866001
God these answers are crazy, Wrong, Wrong, Wrong, Wrong!  in basic words the centrino duo is basically two processors.  The intel core duo is two processors in one (basically)  go here for a better definition, im good with computers not words.\n\n http://computer.howstuffworks.com/microprocessor.htm
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Go for the dual core.  It is faster and more stable if you are like me who like to run many things in parallel.
203139
Software that is written to take advantage of a dual-core processor will allow both cores to work together to complete a task. You won't get true 6 GHz performance, but it will be significantly quicker than if you were running a single core 3 GHz processor. One complaint about the Pentium D chips is the two core use the Front Side Bus to talk to each other, therefore, the processor speed is limited when the two cores are working together. I'm running a Pentium D 830, and aside for an increase in my electric bill, I'm happy with it's performance.
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If you add another gig of memory in core 2 - it will pass duo very nicely :).
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3400+ 939 is 2.2 GHz and 512 KB L2 cache. 4400+ is two x 2.2 GHz processors each with 1024 KB L2. Most applications are currently single thread and will not be any faster unless they use the extra L2 cache space. It will be faster on running more than one application at the same time or, for at least some of the time, when the application uses multiple-threads.  Depending on the data used, the latter can also produce much slower speeds using 2 CPUs. See RandMP in:\n\n http://freespace.virgin.net/roy.longbottom/dualcore.htm\n\nAt least my 2.2 GHz dual core runs cool, but this has 512 KB L2 caches. See: \n\nhttp://freespace.virgin.net/roy.longbottom/burnin64.htm
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There is a big difference depending on what you do.  I just upgraded 100 systems at our work place to AMD 4 Ghz dual cores and we have not crashed one yet.\n\nDual cores are great if you are doing numerous things at the same time.  One department where I work edits video and sound.  Before they had trouble having both programs doing stuff at the same time, now one core will be working with the video and the other with the sound.  The dual cores are good at load balancing between the two cores, almost like having two processors in one system.
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the 1.83Ghz Core 2 Duo is of the series T5x00 and has the same cache size (2MB) as the Core Duos (only the T7x00 series has a 4MB cache).\nthe Core 2 Duo is better in any case though it has the lower clock frequency. this is due to the improved architecture.\nas for the screen size i would go for the larger one.
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The new Intel Duo-something. I have an AMD processor in this one though and it seems to be pretty fast.
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I'm not an expert. but Dual core processers are fairly new: AMD ATLON 64 X2, and also the PENTIUM D from INTEL. They are 2 processing cores on 1 cpu chip.
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THE INTEL DUO CORE IS MUCH MORE BETTER THAN INTEL PENTUM M \n\nIT RUNS AT 667MHZ  FSB AND M RUNS AT MAX 400MHZ
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What is dual core and why should you care? More important, should you buy a dual-core machine?\n \nAt its simplest, dual core translates into "really fast." What computer manufacturers have done to ramp up processing speed before is build PCs with two separate chips, each on its own circuit board. A dual-core computer has two independent processors on the same chip.\n \nThe advantage to dual core is that one chip takes less power than two, so the cooling requirements are lower and the battery life - on a laptop - is longer. For chip makers, and perhaps eventually for consumers, it is also cheaper.\n \nBut the performance - the speed in executing software commands - isn't quite double, as the name implies. Intel says its dual-core laptop chip is about 68 percent faster than the single-core equivalent. Some manufacturers are reportedly saying the real-world boost is only about 30 percent.\n \nYour mileage may vary, as they say, but don't expect miracles. You wouldn't notice a difference using a word processing program or simple presentation or spreadsheet software on a dual-core PC. But if you have all three going at once - so-called multitasking - or are frequently using more intensive applications like video-editing or pixel-crunching computer games, that's when your hardware will feel peppier, experts say.\n \nOf course, along with the hardware comes software. Most of today's software applications are not optimized for all of dual-core processing's benefits. Look for "multithreaded" programs - there are already about 200 out there, including Adobe Photoshop; Windows XP itself is multithreaded.\n \nYou say you're not a gamer or a graphic artist? Well, consider that more and more of Internet- and PC-based entertainment is video-driven. As home moviemaking, DVD creation and other digital combinations of sound, text and images become more convenient and less costly, you may soon be kvetching about your slowpoke single-core computer.
942324
Problem with core processors is very little applications take advantage of the multi cores. Yes, it is faster then the regular core duo. I don't remember the speeds check out http://tomshardware.com for reviews perhaps they did one on this.
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The Intel Duo Core T2600 is 2.2 Ghz, T2300 is 1.67GHz.\n\nThe speed difference can be seen when using an intensive CPU program. \n\nHowever, the price difference is way more than the speed difference. The T2600 is currently WAY OVERPRICED.