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Lambda-Tek, the UK retailer, is currently taking pre-orders on six Coffee Lake CPUs which are expected to hit the market in the coming weeks. The CPUs in question are the Core i7-8700K, the Core i7-8700, the Core i5-8600K, the Core i5-8400, the Core i3-8350K, and the Core i3-8100. Each segment will get an upgrade over the previous generation in core counts: the Core i7 parts will run in a 6C/12T configuration, the Core i5 parts will be 6C/6T, and the Core i3 parts will be 4C/4T (similar to the old Core i5). The flip side of this is that, if data from the retailer is correct, each element of the stack will cost quite a bit more than their direct predecessors.

For example, the store charges nearly £354 for the Core i7-8700K, which converted to USD (and without tax) equals to around $400. This will be a substantial uptick in cost over the $340 that the Core i7-7700K retails for today. $400 may be too high for Intel’s top mainstream CPU, as Intel sells its six-core Core i7-7800X for $375. The HEDT requires a more expensive X299 motherboard and an appropriate DRAM kit, but might have an overall build cost similar to the $400 part.
SOURCE: – AnandTech

Some Basic Prices

Cores Base Freq. Turbo Price
i7-8700K 6C/12T 3.8GHz 4.7GHz (1 core)
4.6GHz (2 cores)
4.4GHz (3,4 cores)
4.3GHz (5,6 cores)
i7-8700 6C/12T 3.2GHz 4.6GHz (1 core)
4.5GHz (2 cores)
4.3GHz (3+ cores)
i5-8600K 6C/6T 3.6GHz 4.3GHz (1 core)
4.2GHz (2,3,4 cores)
4.1Hz (5,6 cores)
i5-8400 6C/6T 2.8GHz 4.0GHz (1 core)
3.9GHz (2, 3, 4 cores)
3.8GHz (5, 6 cores)
i3-8350K 4C/4 4.0GHz $197
i3-8100 4C/4 3.6GHz $130

Price info gleaned from AnandTech.
Frequency info gleaned from CPU-World – which they admit is preliminary.
K processors are overclockable.