Real difference between 2 mobile CPU s

[Efour]

Intel Core i7-6500U 2.5GHz
Intel Core i5-6200U 2.3GHz
It's 70 quid more but both are still dual cores 4 threads?

 

[DragonQ]

CPU is clocked ~10% faster, GPU is clocked 5% faster, 25% more L3 cache.

 

[KompuKare]

Well, we all pretty much know that Intel mostly uses the same die for the mobile lines and that i3/i5/i7 mean little:
i3 is 2C/4T with no turbo,
i5 is 2C/4T with turbo,
i7 is 2C/4T with more turbo and a larger cache.
(There are mobile i7's with 4C/8T but those are 35W/45W etc. and to confuse things further, Intel now have mobile i5's with 4C/4T.)

As well as what DragonQ has said, the i7 gets a higher turbo so for stuff not utilising all the cores it should have better race-to-idle.
Here are the arks:
i7-6500U http://ark.intel.com/products/88194
i5-6200U http://ark.intel.com/products/88193
i5: Turbo up to 2.8GHz
i7: Turbo up to 3.1GHz
Which is inline with their base frequency.
That i5 also doesn't support Intel vPro but that's probably only relevant in business laptops.

 

[Efour]

Perfect many thanks

 

[Brazo]

I have an i5 6200u in my laptop it's dual core with no hyperthreading.

 

[Brazo]

In terms of performance it's about the same as a desktop celeron processer according to the benchmarks I've run.

 

[Axeboy]

Might be of use:
http://cpu.userbenchmark.com/Compare/Intel-Core-i7-6500U-vs-Intel-Core-i5-6200U/m36930vsm36796

 

[pingu666]

mobile parts tend to be a whole level worse in confusing naming convensions :/

 

[ATIorNvidia]

I have an i5 6200u in my laptop it's dual core with no hyperthreading.

It definitely does have hyperthreading if it's a 6200u.