Dual s1366 cpu upgrade question x5680 vs x5687

[masterdeejay]

I have an old dual s1366 workstation. Lenovo D20.

Currently it has two X5675 cpu-s.
The s1366 cpus are very cheap on ebay/ali... etc so i can upgrade for a little price.
I used this machine for work (VM machines, servers...), but now its is only for gaming.

What is the best upgrade option for gaming?:
two X5687 - 8 cores but higher clockspeed, cheap under 2x20 USD
two X5680 - 12 cores lower clockspeed, little faster than current x5675 - i have only one now, but i need another for the second socket. 1x35 USD
X5690 is better but costs too much (2x50 usd on aliexpress and it have a chance to have customs tax (in Hungary that is +27%))
i can sell the two x5675 localy for a good price, so the az upgade cost me almost nothing.

I have a 1070Ti, and a lot of ram (6x16gb), two ssd's... so i think for gaming the cpu limits the fps. Overclocking is not possible on this workstation.
Am only playing a few games, minecraft, 7dtd, men of war, skyrim, and sometimes star citizen
I really like this old machine, and i dont want to buy a new ryzen or something only if this dies.

Thanks!

 

[masterdeejay]

I sold the machine but i keept the ram sticks and the video card, SSD-s.
I want a same 12 core machine and i dont want to spend a lot, so i keept the memory. I wanted something newer that works with ddr3 memory, the only thing that i found was the chinese brand 2011v3 boards.
I have now a Jingsha x99 modded Huhanazni x99-TF bios for memory overclock (120 USD ebay)
CPU is an ES E5-2673v3 all core turbo set to max 3.1Ghz via microcode hack (100 USD ebay)
Ram is from the old machine, overclocked to 1833mhz 1.5v 13-13-13-36 CR1. (the 1066 modules have the same chips K4B4G0446D as the 1833 so it is not a big overclock as it seems) 17 USD / stick local seller (was 2 years ago), i use only 4 sticks for overclocking, im selling the other two sticks. (4x16gb is fine for now) Running stable memtest86 2 hours now, i leave it for 4-6 hours. (ram temperature is a little high 70-80C when testing, 50-60C normal gaming) Not booting on 2133mhz, i dont want to give extra voltage them.
CPU cooler is an used Alpenföhn Brocken 3, very big thing (local seller 21 Usd)
Case is an old Chieftek ATX + original Win7 Pro key sticker from trash
PSU is new (opened box) Super Flower 750w platium (65 USD)
(cpuqueen was tested on stock ram speed, but it is almost the same points with overclocked ram)