Intel Core i5-6600K 3.9GHz (Skylake) Socket LGA1151 Processor - Retail
Asus Maximus VIII Gene Intel Z170 (Socket 1151) DDR4 Micro ATX Motherboard
TeamGroup Elite 16GB (4x4GB) DDR4 PC4-19200C16 2400MHz Quad Channel Kit - Black
Total : £473.57
Intel 5820K 3.30GHz (Haswell-E) Socket LGA2011-V3 Processor - Retail
Gigabyte X99-SLI Intel X99 (Socket 2011) DDR4 ATX Motherboard Gigabyte X99-SLI Intel X99
TeamGroup Elite 16GB (4x4GB) DDR4 PC4-19200C16 2400MHz Quad Channel Kit - Black
Total : £537.56
64 quid more for 6 core and 12 threads why anyone if buying new now,and wanting new DDR4 would not go 5820k is beyond me.
As picked up by many, you decided to put an expensive feature full Z170 motherboard vs a lowest end X99 board just to try boost your point.
The most equivalent board is the £113.99 Gigabyte GA-Z170XP-SLI vs Gigabyte X99-SLI
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Intel Core i5-6600K 3.9GHz (Skylake) Socket LGA1151 Processor - Retail
Gigabyte GA-Z170XP-SLI Intel Z170 (Socket 1151) DDR4 ATX Motherboard
TeamGroup Elite 16GB (4x4GB) DDR4 PC4-19200C16 2400MHz Quad Channel Kit - Black
Total : £417.56
VS
Intel 5820K 3.30GHz (Haswell-E) Socket LGA2011-V3 Processor - Retail
Gigabyte X99-SLI Intel X99 (Socket 2011) DDR4 ATX Motherboard
TeamGroup Elite 16GB (4x4GB) DDR4 PC4-19200C16 2400MHz Quad Channel Kit - Black
Total : £537.56
And that is OcUK pricing, shop around and you can get the i5 kit for £20-30 less.
£120-140 quid more for 6 core and 12 threads, some may say worth it some may not. As MSTRBKR said, why spend that £120 if you don't need it.
£537.56 is a good price for the 5820K, but it is only made possible with the recent big price cuts at OcUK (and fair play to them)
Sandy to a 4790k and an cheap z97 and keeping your DDR 3 would make sense.
I don't get this resale stuff tbh... You buy the fastest your budget allows.
My path is cheaper and stonks a 6600k for less
you tried selling DDR2? completely worthless now

, You talk about reusing DDR3 a lot, but DDR4 can be used for future builds, its not just the case of resell value, but also reuse value.
of cause the 4790K will stonk a 6600K, but cheaper?
I have already made the case about the the Asus Z170-P and the Asus Z97-P. Practically the same board with a £14 premium for LGA1151.
4790K £260 (on offer right now), vs a 6600K for £186 (cheapest possible).