You'd be spending a giant bucket of money, for little or no noticeable difference.
so i was asking for advices!
i play GTA V (usually i need about a year to finish a game, so it s going to last a lot)
and a little black ops 3 and Battlefield
Do you find yourself having performance problems in GTA V? Do you think an extra 15% framerate will really make the game that much more enjoyable? Can you not just turn down the AA settings slightly and get on with your life?
What video card do you have?
5 GHz of Sandy Bridge IPC is rather average now. Not to mention it consumes significantly more power than a modern Intel CPU. An upgrade to a highly OC'd 6700k and DDR4 3200+ MHz at tight timings will obliterate the 3970x, even at 5 GHz. If you need more than 4 cores, I would look at Broadwell E. Even if it tops out at 4.2 GHz, the far faster RAM would make it pull ahead.
X79 is rather dated in general. Upgrading to X99 with the new Titan X would be a massive upgrade.
What RAM speed and timings do
obliterate
By what, 10-20%? That's not exactly mind blowingly more performance considering the several hundred dollar cost for the upgrade.
No one would deny that a 6700k or 6950x or whatever would be faster, but I just dont see how you can warrant the ~$500+ to upgrade to either one when I highly doubt he is CPU bound in ANY of the games he currently plays.
If he was playing something specific that just NEEDED more CPU power, then maybe an argument could be made. But from what I can tell he just wants to upgrade for the sake of upgrading more than upgrade because it will give him any tangible benefits.
Where are you getting 10-20% from?
OP likes to test games. Skylake with fast and tight ram will OBLITERATE old Sandy Bridge E due to slow RAM and old chipset.
Let's say OP gets a 4.6-4.8 GHz i7-6700k. Even with gimped 2133 DDR4 with loose timings will easily get 25-30% gain in single threaded performance; the important factor in games.
Now add DDR4 4000 with tight timings and add another 10-20% in single threaded bound games. Look at how minimum fps is raised in single threaded bound games with fast DDR4:
http://www.techspot.com/article/1171-ddr4-4000-mhz-performance/page3.html
Skylake is a no brainer, especially when looking to add the new Titan X.
The word OBLITERATE. You keep using that word, I don't think it means, what you think it means.
easily get 25-30% gain in single threaded performance
In the CPU world, 20-30% gain is huge. That is a night and day difference in some titles; especially when talking about buying the Pascal Titan X!
From everything I read, the 6700k is the chip to go to for strickly gaming.
A 3930k @ 4.9GHz gets roughly 160-170 CB single core in Cinebench R15 and a multicore score around 1300-1400 CB. The 6700k at stock gets ~165 CB single core and ~920 CB multicore.
Once OC'd the 6700k gets ~190 CB single core and ~1050 CB multicore.
I'm not trying to argue the 6700k WOULDNT be an upgrade, but you can hardly justify $500+ for that kind of performance gain (minimal). It's a farsight from your 25-30% claim. In Cinebench R15 anyway, single core performance only goes up ~18%. Which falls in line with my 10-20%.
What single-threaded score does Broadwell-E get at around 4.2ghz?