kaku;30488044 said:
Very interesting. I'm struggling to understand the model differentiation though: surely there's more difference than a 200MHz core bump between the 1700X and the 1800X? £80 price difference seems like a very large gap.
From the other camp, the 6800K to 6850K jump is 200MHz for over £100, so it's not unheard of... Well that and the extra PCI-E lanes if you actually need them.
The only competitive 8-core CPU around at the moment is the Broadwell-E 6900K for about £1000, so even if the lowest R7 is 10% or so slower IPC-wise and has around 3-3.2GHz base, if it's priced below ~£700 it's still going to be potentially quite competitive.
You also have the option of the Xeon E5-2630 V3 (8C/16T, 2.4GHz/3.2GHz, 85W) for about £600 but it's slower and non overclockable; or its E5-2630 v4 bretheren (10C/20T, 2.2GHz/3.1GHz, 85W) also for about £600, but while you gain another 2C you lose even more speed.
It's still very much speculation, we have to just wait a bit more and see what AMD actually comes up with. If the SR7 Black comes out at ~3.6GHz base and about £300 it'll be sheer madness, even £450 would be outstanding provided they haven't dropped the ball with any peculiar performance losses. It'd make me kick myself for getting a 6800K so close to launch...
There are at least another couple of admittedly not major potential disadvantages for AM4: "only" dual-channel DDR4, and the inferior number of PCIe lanes even in the X370 boards (8 PCIe lanes for the chipset, and max 24 PCIe lanes for the CPU - 16 for graphics, 4 for NVMe, and 4 to communicate with the chipset). In real life however I doubt that either of these will be an issue for the vast majority of users.