Thread: i7-2677M vs. i5-4250U
12-10-2013, 11:55 PM #1i7-2677M vs. i5-4250U
I've been trying to decide between these two refurbished MBA's:
Refurbished 11.6-inch MacBook Air 1.8GHz dual-core Intel Core i7 - Apple Store (U.S.)
Refurbished 11.6-inch MacBook Air 1.3GHz dual-core Intel Core i5 - Apple Store (U.S.)
and somebody told me that the 4th gen i5 1.3 Ghz would outperform the 2nd gen i7 1.8Ghz. I compared them on Intel's website, and though I know the i5 is the newer CPU, I still don't quite understand how it could be better than an i7 with hyperthreading and so much better specs. Can somebody explain this to me?Have no fear. Wman is here!...or something...
12-11-2013, 05:43 AM #2
- Member Since
- Oct 01, 2007
- 27" iMac i7 (2011) 10.10, iPhone6, iPad Air 2, AppleTV2
You have been advised correctly in that the latest i5 will outperform the older i7
Notebookcheck.net has good cpu comparisons based on benchmarks. You can also click through to see performance in certain applications
Mobile Processors - Benchmarklist - NotebookCheck.net Tech
Here's your i5
Intel Core i5 4250U Notebook Processor - NotebookCheck.net Tech
Here's your i7
Intel Core i7 2677M Notebook Processor - NotebookCheck.net TechExternal hard disk acquisition addict - but admitting the problem is the first step to a robust backup
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12-11-2013, 06:23 AM #3
- Member Since
- Nov 26, 2012
- Agusan del Norte, Philippines
- L2012 Mini, i7 2.6Ghz, 8GB RAM, 256GB SSD + 1TB HDD(fusion), BenQ 32" 2.5k QHD Display
Interesting results. I would expected them to be equal at best. Have to keep this in mind the next Mac Mini upgrade roles around.
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12-11-2013, 08:20 AM #4
- logic board architecture is improved (speedier)
- faster graphics hardware
- faster ram
All contribute to how well (overall) an individual computer model will perform.
As far as the comparison of cpu's themselves. With every generation of cpu...each generation is improved. So it really shouldn't be that surprising that a 4th generation i5 cpu can outperform a 2nd gen. i7 cpu.
The performance difference between an i5 and an i7 of the exact same generation (same number of cores and same clockspeed) may not be that dramatic. For discussion's sake...maybe we're talking a difference of only 10-15%.
So it really isn't that difficult for an i5 cpu that is 2 generations newer...to be able to out perform an older i7 cpu.
Some additional info. The main differences between i5 and i7 cpus are:
- i7 cpu's generally have higher clock speeds (ghz)
- i7 cpu's generally have more cores (4 cores vs. 2 cores). You generally don't see many quad-core i5 cpu's (at least not in the Apple World).
- i7 cpu's generally have a greater cache
- i7 used to exclusively have "hyper-threading"
i5 vs i7 - Difference and Comparison | Diffen
But with multiple generations...newer i5's have faster clock speeds, newer i5's have hyper-threading, newer i5's have larger caches, etc. So basically...newer i5's can be better than older i7's.
Combine this with better logic board architecture, faster ram, etc....and it's really not that difficult for a newer computer with a newer generation i5...to beat the performance of a computer with an older generation i7.
12-12-2013, 04:53 PM #5
pigoo3 is your name a reference to Pigoons from Marget Atwood's Oryx and CRake?Have no fear. Wman is here!...or something...
12-12-2013, 06:28 PM #6
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