RBX Water block

The CPU water block is the heart of any water cooling system; it has to be strong and can only work properly if all the other parts play along nicely with it. Danger Den’s RBX has nothing to do with Snoop Doggy Dogg but it did build a reputation of being one of the “bad boys” in the water cooling scene.


the finishing on this block is simply amazing, a real work of art, it looks perfect


the base is very smooth and has been machine lapped up to 1200 grit


For starters, it has 3 instead of 2 fittings which you commonly see, with the use of an Y-splitter you can hook it up quite easily. The water enters in the middle and leaves on both sides, below the center fitting you will find a nozzle which directs the water at the center of the copper block thereby increasing the overall heat transfer rate between the hot copper and the cool water.



To further enhance your experience one can order the optional Nozzle kit, which includes 5 accelerator inserts, each sporting a different pattern. There are stickers on the RBX warning you that removing them will void warranty, however, the stickers only indicate that these blocks have been lead tested at the Danger Den labs, when opening up the block to install other nozzles your warranty still covers manufacturing defects.


Don’t let the stickers scare you, it’s DD way of indicating that this block has been pressure tested by them!




The 5 different nozzles in the optional kit

The more restrictive the nozzle, the higher the performance, if the block is used with a high output pump. The nozzle #5 proved to be the best performer in Liquid3D’s tests here and we used it for our first install, after running 3 weeks the system started experiencing decreased performance, nothing earth shocking but worth checking out.

We found that the nozzle #5 clogged easily when there is small residue somewhere in the water loop. A very small amount of Teflon ended up in the water (we did not see anything fall into the water during installation). This is what the nozzle looked like:



After cleaning it out we continued on and ran our final performance tests.

Recents tests of the TDX (the RBX smaller brother), comparing the nozzle #4 and #5 show that the difference between those 2 is quite small. Since #4 will not clog up any time soon and is less restrictive it makes it suitable for a wider range of pumps while keeping performance above the level of the standard accelerator nozzle.

Let’s take a look at DD’s 12v pump ->