I've seen it run ok even on a regular laptop.
I have seen it running on -
E8300 with 3870 x 2
E8400 with 3870X2 x 2
E8400 with GTS250
E7500 with GT240
Pretty much anything bought in the last 3 years will run it. The only thing you might need to change is get a custom scope that does not have the black surround as it is rendered as a shadow and can kill performance.
The most important things in the early stages are:
Autocannons (anything with a 100+ RPM) are the devil and you should avoid them at all costs. If you must use one, please shoot my Hotchkiss lots, it tickles, I once took 78 hits in a Hotchkiss with almost no damage.
Besides shooting tanks in the sides/back when you have to shoot them front on you shoot at the lower plate between the tracks. Each tank will also have different weak points (check the WoT forums) to shoot at but be aware some tanks, like the IS-4, the weak spots are relatively weak not damage every time weak.