Just for comparison i have done some tests with Scythe ninja heatsink as passive and highest temps i have seen so far have been 65,5c even that the ambient temp is over 5c lower than when i tested my self made heatsink.

So thinking that as in passive cooling this huge chunk gave 10-15c lower temps (highest 55c in much hotter room) than Scythe ninja.. its not bad at all.

I should make precise tests with both coolers in same day with same ambient to be exact but i have other things going on and i dont know does anybody even care if its 10 or 12c better.