How much faster is a desktop i7 than a mobile i7?

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Casper Traberg-Larsen

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I am having a discussion. How much faster is, say a, 4790k than a i7-4500u? or i7-2620m?

How many "years of performance" are mobile CPU's behind? Like, WHEN approx. will a mobile i7 be faster than the desktop 4790k? :)

thanks for inputs!
 
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Undying89

Undying89

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No, not even close. i7 4500u is a dual core with HT at 3Ghz. Its even slower than desktop i3.
 
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Casper Traberg-Larsen

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Allright! But you're telling me, that there are quad core mobile i7 CPU's out there, which can beat a i5-4670 (example)?
 
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Sakkura

Sakkura

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The Core i7-4500U has 2 cores and runs at 1.8-3.0 GHz. The Core i7-4790K has 4 cores and runs at 4.0-4.4 GHz. Overclocking it to something like 4.6 GHz is realistic.

That means it has up to a 33-144% single-threaded performance advantage, or 53-156% at 4.6 GHz. The extra cores make that a 167-389% multithreaded performance advantage, or 207-412% at 4.6 GHz.
 
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Undying89

Undying89

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i7 4700QM would be around 4670k performance. Even so i7 4700qm is 2.4-3.4ghz while 4670k is 3.4-3.8ghz. More or less they will perform the same but in singlethreaded applications or even gaming desktop i5 will be somewhat faster.
 
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Sakkura

Sakkura

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In singlethreaded performance, the fastest laptop CPUs more or less match a Core i5-4670. They will have 20-30% more multithreaded performance because of hyperthreading.

But bear in mind you can get hyperthreading with a Xeon E3 for only slightly more money than a Core i5. And vastly cheaper than anything in laptops.
 
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Casper Traberg-Larsen

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Thank you both! I get i now :) One last question though. I just googled a 4810mq which has amazing performance. It beats desktop i5s pretty good and is not far behind desktop i7's. How long time until there will be a mobile CPU (maybe like 5xxxmq) which will beat a 4790k?
 
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