Really I don't know I asked one man when I'was projecting this and he told me that "it should have something on the center" This center pole has 15 mm diameter and 25 mm tall so it's about 40g of copper. Base weight is 630g. So it's a few procent of weight of whole base. But is located directly above cpu core. Probably it gives a little better temps on DI and better temp controlling on LN2 or it doesn't give anything It also hard to measure, but I have an idea. From this bar I'm going to make similar base but without center pole (same dimmensions). I should be able to compare them on loadtester (2-3 resistors which can give 100-200W heat load) I'll be remeber about that when I'll be buying DI another time.