Next week, I'll finally be buying a new processor to replace my now out-dated i5 2320 3GHZ one. There are two options available to me:

 

Intel® Core™ i7-5960X Processor Extreme Edition 
(20M Cache, up to 3.50 GHz)

 

Intel® Core™ i7-4790K Processor 
(8M Cache, up to 4.40 GHz)

 

While the first one is a lot slower, it can be OC to 4.4GHZ on a cooler. So, that'd mean they'd be 8 cores, each working at 4.4GZ, as opposed to just 4 cores as with the 4790K. Would FSX make use of all of those 8 cores, and will it cause stuttering/tearing? Will X-plane also make use of those 8 cores? If both CPU run at the same speed, then surely the 5960X is best, right? Dumb question, but I hear people say that FSX has problems with more than 4 cores and X-plane has issues with hyperthreading.

 

My GPU will be a Titan X

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So, that'd mean they'd be 8 cores, each working at 4.4GZ, as opposed to just 4 cores as with the 4790K.

The i7-4790K has hyperthreading = 8 logical cores + 8MB cacher + socket 1150

The i7-5960X has hyperthreading = 8 logical cores + 20MB cache + socket 2011 v3

FSX can only use physical cores, some people overclock with hyperthreading disabled for an FSX session. I'm sure newer flightsims will take advantage of logical cores. Your choice will depend upon whether the features of the 2011 v3 socket motherboards are important to you, although 20MB of cache is also interesting!