Help choosing between i7-6800K vs i7-6850K

[chaparral]

Am looking at upgrading from my i7-4770 to one the x99 setups which am hoping to do before the free window 10 upgrade is over (29 july)

Can anyone tell me if the only difference between the i7-6800K and i7-6850K is a 200mhz clock speed ?
(surely it not worth paying an extra £160 for just an extra 200mhz on the i7-6850K )

i7-6800K
https://www.overclockers.co.uk/inte...rocessor-retail-bx80671i76800k-cp-611-in.html

Features:
- 3.4 GHz Base Frequency
- 3.8 GHz Max Turboi Frequency
- 6 Cores
- 12 Threads
- 15 MB Cache
- 140W TDP
- DDR4 2400/2133 controller

i7-6850K

i7-6850K
https://www.overclockers.co.uk/inte...rocessor-retail-bx80671i76850k-cp-613-in.html

Features:
- 3.6 GHz Base Frequency
- 4 GHz Max Turboi Frequency
- 6 Cores
- 12 Threads
- 15 MB Cache
- 140W TDP
- DDR4 2400/2133 controller

 

[chaparral]

The 6850k has 40 pci lanes and the 6800k has 28 pci lanes, 2 gpus config the 6800k 3 gpu's the 6850k would be better..

Am never going be running a three GPU setup in TRI-SLI (not even sure if NVidia new 10 series still support tri-SLI)

But does 28 vs 40 lanes effect two way SLI at all or anything else like M2 SSD's or memory speeds ?

 

[chaparral]

Thanks mickyflinn