Yeah, with 2 added cores, i5 8600k would really give R5 1600/1600X a run for their money. Intel has quoted that 8600k would perform more than 50percent better than 7600k in multi-threaded performance and i believe that would be the case.
And people cant deny the fact that the 8600k would perform great in games due to the IPC advantage over AMD processors.
We know that Intel has a winner on their hand, the only thing left for Intel to do is, price the processor right. If they price the processor anywhere between 220-230 dollars, AMD would start feeling the heat and may think they are in trouble once again. If they price the processor in the range of $250. That would defeat the whole purpose of launching a 6core processor (people would again think that money hungry Intel is again charging more for the extra performance) and people would prefer paying $20 more to get R7 1700 (the price of this processor falls to this level every now and then).
Edit : i5 8600k wouldnt come with HSF, so people would anyways have to shell out $20 or more for a decent enough air cooler and R7 1700 comes with a decent HSF, so i dont see a reason why anybody would go with 8600k which would definately not be able to match R7 1700 in multi-threaded performance
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Its a wait and watch game now.