You are already getting an obsolete CPU so you can’t really future proof that nor the motherboard or RAM.
Having said that, two of those XEONs (12 cores/24 threads) will give you pretty cool speeds with ShaderCompileWorker (which compiles shaders in UE4) and no i7 could beat that.
Also for code compiling, making builds often or just compiling in general, will greatly benefit from dual CPU multi-core setup.
I did not look at the T7500 spec but general bottlenecks will probably be RAM, GFX and HDD so those might be areas you want to look into.
RAM is something permanent since once you get it, you won’t be changing it. And you are probably getting whatever configuration comes with it anyway. Generally the more the better, I’d say 16GB min.
GFX I suppose you could go with GTX 980, although T7500 probably does not have PCIe gen.3 so GTX’s performance might not be greatest, but far from bad either. That could be your future proofing area.
HDD is really up to you - if you hate waiting, SSD all the way, but beware compiling all the time will wear it down faster (first hand experience here
THANKS, Ram i am getting is 12 GB ECC , currently … I will get more as soon as possbile,