On Tuesday 10 Nov 2015 17:47:08 Stanislav Nikolov wrote:
> Dear Gentoo users,
> I'm building a new PC. I have a budget of ~$550-$650. No GPU, no special
> case (I may use a card box), not even a hdd or ssd. So, as you can see,
> it's pretty much "get the best CPU and mobo/ram that are compatible with
> it". The problem is, which is the best one. By "best" I mean to compile
> shit fast. My laptop with 3rd gen i5 compiles firefox for 40 minutes on
> average.
> 
> The most expensive Intel CPU is the skylake i7-6700k. But is it the best?
> Is there something from AMD that will perform even better? I can't find
> any benchmarks with AMD/Intel CPUs. And how much does the mobo matter?
> Will a cheap $30 400W PSU power that thing?
> 
> Thanks

I don't (yet) own a i7-6700k, but my 6 year old laptop with (1st generation) 
i7 Q720  @1.60GHz takes slightly less than yours:

     Sat Oct  3 14:35:40 2015 >>> www-client/firefox-38.3.0
       merge time: 36 minutes and 53 seconds.

     Fri Nov  6 09:10:06 2015 >>> www-client/firefox-38.4.0
       merge time: 38 minutes and 8 seconds.


In contrast a year old AMD A10-7850K APU is significantly faster:

     Sat Oct  3 19:40:48 2015 >>> www-client/firefox-38.3.0
       merge time: 17 minutes and 42 seconds.

     Fri Nov  6 08:41:02 2015 >>> www-client/firefox-38.4.0
       merge time: 18 minutes and 18 seconds.


I would also be interested to see compile times of more modern i7s and FXs, 
but bear in mind that in single core operations Intel is these days 
significantly better than AMD.

-- 
Regards,
Mick