Danger Den RBX Waterblock Review



Danger Den is one of the most respected names in water cooling and I normally jump on any new product from them as soon as it comes out for testing. While the Danger Den RBX has been on the market for some time now, I somehow never managed to test it until recently. I had already worked my way through most of the information that was available online for this water block so I thought I had a good idea as to how it would perform in my usual water cooling loop — as it turned out, that was a mistaken assumption but I’ll save that for the results. On to the goods…

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The RBX comes nicely packaged in a compact white box which seems to be the case with all of the blocks from Danger Den nowadays. The box label has a small picture of the water block and other relevant information such as the type of top (the RBX is available with either a poly top or a brass top) and the size of the fittings. Inside the box, one will find the block itself and a small Ziploc bag with the required mounting hardware including 4 threaded rods, 4 springs, nylon washers and nuts.

More specifically, the RBX is normally packaged as follows:

• Complete Block Assembled with Top and O-ring
• #1 Accelerator Plate
• High Flow 1/2″ or 3/8″ OD Fittings
• Mounting Hardware
• AMD anti-crush pads
• Machine Lapped and polished beyond 1200 grit
• Pressure tested before shipment to 85psi


• Additional Nozzle Package include #2, 3, 4, 5, and one blank
• A socket wrench to remove the top’s bolts
• Brass Top

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Once I removed the block from the packaging, the size of the RBX caught me a little off guard. While I had already looked at many images of the block and read the specifications long before receiving it. The size of it is still really surprising, as the RBX is much smaller than most blocks. From a quick look at the design, it is obvious that like most jet impingement style blocks, the cooling is focused entirely upon the small area of the block that rests directly over the processor’s core once the block is properly mounted. The last picture above shows the RBX (on the right) next to a more traditionally sized and shaped water block (the Demonic Cooling XTC).

As mentioned in the specs listed above, the base of the RBX is machine-lapped and polished beyond 1200 grit by Danger Den. The RBX I received had a very smooth base and there were no visible machine marks or other obvious signs of base finish defects that would hinder cooling performance.

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The accelerator nozzles on the RBX are a very interesting concept. They allow the end user to adjust the water flow through the block to best suit the rest of the cooling system. The accelerator nozzle kit contains four precut nozzles and one blank for your own design. The #1 nozzle is the only one included with the block but the nozzle kit is fairly inexpensive considering the adjustability and performance tweaking it allows.

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Underneath the top plate and the accelerator nozzle plate, there is a copper base that is nothing short of being the end result of some very nice CNC machine work. There are a series of “wave channels” and “heat voids” that direct water flow through the block and then out the exit barbs which are mounted on either side of the inlet barb.

That pretty much covers how the RBX comes out of the box so, let’s change it up a little.