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.
But the question that remains is how many FLOPS one thread of 2600k and how many FLOP one core of 4670k can calculate... (with cycles etc. formula)
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 email@example.com.
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.