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Quick background: I'm looking for a new laptop - my old one which had a Core i7 (and died after a year) didn't overwhelm me with its speed, so I figure I shouldn't get anything worse than an i7 in this one. I then noticed that there were many different "versions" of the Core i7 (e.g. 4700MQ, 3517U, etc.) - I had no idea, and really thought there was just one Core i3, one Core i5, and one Core i7.

I found cpubenchmark.net which has a comprehensive list of many processors. They assign a "Passmark CPU Mark" to each of them. For example, the 3517U's value is 3738, while the 4700MQ's value is 7982. My question: what's the real difference between these two? Is this rating linear (e.g. is the 4700MQ more than twice as fast as the 3517U?)? If I have two otherwise identical machines, how much of a difference will I notice between the two processors?

Hennes
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Jer
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    well I guess a big difference, but for real life it's quite likely a bigger or at least massive difference, comes from using an SSD hard drive. windows load times on a slow atom processor is bloody fast with an ssd and even internet seems much faster. – barlop Oct 02 '13 at 15:17
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    This will be impossible to answer definitively. Much depends on the exact application and also the other components. For example, will the GPU be the issue even with the fastest current processor? Will disk I/O be the issue, etc? – Dave M Oct 02 '13 at 15:18
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    I'll second @DaveM's comment - processor alone isn't the only factor that can influence how fast your system feels (and often isn't the main factor). Without knowing your use case, it's hard to say what kind of configuration would work well for you. That being said, [the Passmark scores are on an absolute scale](http://www.passmark.com/forum/showthread.php?1629-Comparing-CPU-Mark-scores), so yes, about double the performance in your example. Note the comments in the link there that scores may not reflect real world performance. – ernie Oct 02 '13 at 15:23
  • All the differences can be looked up on Intel's website. The design differences between 3517U and the 4700MQ would take about 300 words to describe ( all of which is on Intel's website ). – Ramhound Oct 02 '13 at 15:25
  • @Ramhound: (if that's yours) I don't think that deserves a -1. The question sow previous researches, and the answer is far from obivous for someone that is not into computer hardware. – mveroone Oct 02 '13 at 15:29
  • @Ramhound - thanks, I didn't realize you can do that. Their comparison tool is definitely helpful. But knowing that one has 4 cores vs. 2, etc. doesn't really answer my question about what real-life difference there will be. – Jer Oct 02 '13 at 15:30
  • @Jer - You are not even comparing the same generation of chip. You cannot really compare an Ivybridge to Haswell. A 4 core Haswell chip is clearly going to be faster then a 2 core Ivybridge. The 4700MQ is ~26% faster, has more cache, and has 2x as many threads. You asked what the real differences are, all of those, are significant differences that are outline on the specifications for the products. – Ramhound Oct 02 '13 at 15:43
  • @Ramhound - I'm sorry if my question wasn't clear - I'm really just interested on what the differences I'd notice as a user of the computer will be. I do understand that the 4700MQ will be faster, but I don't know how much (not in clock speed, but in real-life sense - and yes I realize this is not easily quantifiable). Essentially, if we took two machines that are otherwise identical except for the two processors and gave them to my grandmother to use, what would she say the difference is? Would it be twice as fast to open iTunes on one of them? Would streaming video be jumpy on one? etc. – Jer Oct 02 '13 at 16:21
  • @Jer - What other then clock and cache (memory) would effect the processing speed of a computer? The Haswell product your asking about is at least 2x faster. There is more then just processing speed that makes a system appear to be slow. You don't really describe why you thought it was slow. If you were using all your system memory that would explain why the system seemed slow, had nothing to do with the processor, but everything to do with the supporting hardware. i7 products of any generation of Intel CPUs are going to be the "fastest" overall. – Ramhound Oct 02 '13 at 16:25
  • i7 products of any generation of Intel CPUs are going to be the "fastest" overall and have the most features ( hyper-threading, additional cache, ect ). – Ramhound Oct 02 '13 at 16:30
  • Possible duplicate of: [Why are newer generations of processors faster at the same clock speed?](http://superuser.com/questions/543702/why-are-newer-generations-of-processors-faster-at-the-same-clock-speed) – Breakthrough Oct 03 '13 at 12:22

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Most of the times, the criteras are :

  • Clock speed
  • Multiplicator unlocking
  • L2/3 cache size
  • number of cores
  • Hyperthreading(2 execution lines per core)

(TDP depends of most of those criteras)

By variying all those, constructors build a very wide range of processors in each generation. But as stated in other comments, that is not always the most impacting factor in a computer "speed feeling" which heavily depends on the OS and software used.

Note that some of those models are the exact same chips on which the clock speed depends on how well they succeeded in the QA tests. Melting 22nm tracks can be sometimes a bit less well-made on the same production chain, giving a slower processor for the same heat generated.

An i5 is often way enough, and a SSD will impact greatly the feeling of a smooth computer.

mveroone
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