Any game uses all the processor performance, then both processors are from different processor’s generation, and the Intel® Core™ i7-2600K Processor has e different technology called Hyper-Threading here you can get more info about this: http://www.intel.com/content/www/us/en/architecture-and-technology/hyper-threading/hyper-threading-technology.html
On this link you can find the comparison of both processors.
Here is the information I could find to you, hope this helps; Composite Theoretical Performance (CTP)
On this link you can find the Adjusted Peak Performance APP, Intel® Core™ i5-4670K Processor is not listed there, so I recommend you to send e-mail inquiries for this unlisted processor to firstname.lastname@example.org.
Export Compliance Metrics for Intel® Core™ i5 Processors
Here are the metrics for the Intel® Core™ i7-2600K Processor
CTP in MTOPS = Millions of Theoretical Operations Per Second
APP = Adjusted Peak Performance, calculated using a government supplied formula.
WT = Weighted Teraflops. The APP calculation is expressed in Weighted Teraflops
In computing, FLOPS (or flops or flop/s) is an acronym meaning Floating-point Operations Per Second.
The FLOPS is a measure of a computer's performance, especially in fields of scientific calculations that make heavy use of floating point calculations, similar to the older, simpler, instructions per second.
Gigaflops = 109
Teraflops = 1012
The 1-way, 2-way, 4-way columns are calculated APP #’s for theoretical 1-processor, 2-processor and 4-processor systems.