Koolance CPU-380

As we unbox we see instructions, various backplates, TIM and the tools required to install:

The block itself is fairly heavy, mainly because of the hefty nickel plated mounting plate
that goes around the block. This is fairly typical for Koolance and a similar weight was used
on the CPU-370:

Koolance have a nice sticker that protects the base which is of higher quality than most of
their competition:

The base is a perfect mirror and the plating is of excellent quality:

From the reflection we can pinpoint some non-linearities in the base which are presumably
related to a jetplate:

The other nice touch is that Koolance have updated their nut design. Instead of a circular thumb nut like the 370 block, the nut now has slightly rounded off wrench flats so that you can use a torque wrench to install if desired. Although Koolance recommended 0.6kgm*cm (0.04lb*ft) to me, it’s not included in the instructions. As I follow the principle of installing blocks for test like an end user would then I did not measure the torque and instead followed my nose as usual. Indigo Xtreme will be used at a later date to take out any mounting error effects.

I only look at the internals after testing. So any marks/staining is most likely because the
block is now used and not necessarily related to manufacturing quality. 4 Torx head screws
hold the 3 main parts of the block together and are removed using the proved allen key:

After removing the mounting plate the “core” of the block remains:

This comes apart easily showing the acetal top with 2 o-rings and the base with jetplate:

A close up of the acetal top, some manufacturers like a 2nd o-ring for the jet-plate and some
don’t. I haven’t particularly noticed a performance difference as a result though:

A close up of the jetplate which looks like most others:

The base has some staining around the o-ring location:

The machined channels in the base are much deeper and wider than on the previous CPU-370
block. The CPU-370 favored very many small and long channels.

The channel area measures about 28mm wide:

By about 30mm wide:

It would seem that the total channel area of the CPU-380 (45 channels in an area of 28x30mm)
is less than the CPU-370 (53 channels in an area of 28mmx35mm) but because of the depth of the
channel cut that the surface area may still be higher.