Commissioning
I’ve already mentioned that I don’t really trust the glued-on VRM coolers and use additional rubber rings, even if Ziitek thinks something like that should hold with their pads. With aluminum I would probably have fewer concerns, but copper weighs and pulls, depending on the installation direction, then quite neat. I currently prefer my additional rubber mount, although of course it is always about the user factor. If you knew what kind of maliciously executed hardware arrives in the RMA departments – you would lose faith in humanity.
Thermal glue is absolutely safe, but exactly such users like to tear the MOSFETs from the board, because they have never heard of isopropanol and soaking. By the way, this also applies to the RAM modules with the older single coolers. No, then rather thermal tape and my additional fixation.
Measurements and an aha effect
I run the card standing up in an open setup. The room temperature is higher again this time on purpose for this very reason, and I have set the air conditioning to 24 °C instead of the usual 22 or even 20 °C. Winter feeling and richly decadent. This brings me closer to the situation in the well ventilated enclosure and my gas bill is once again heading towards orbit…. I wasted almost 4 hours and used 6 grams of thermal paste just to measure the optimal pad thickness for the prototype. In addition to electricity, of course, which comes from a combined heat and power plant here and is virtually a by-product. But unfortunately it is still expensive, because it is not my power plant.
We can also see on the picture above the cables of the two measuring resistors, whose supplied values I can also log. I intentionally only test the worst case for GPU and RAM with Furmark in burn-in mode and post-processing. Gaming is then once again significantly lower and everything goes towards room temperature in idle. The two eLoops from Blacknoise run at 1500 rpm, but 1000 rpm would also have been enough, and even only 800 rpm for gaming, although the RAM then clearly exceeds the 80 degree mark and the MOSFETs then scratch at the 90 °C. You don’t have to have that, because this is also about efficiency. Cooler VRM also means less power dissipation and more electrical power for the GPU. That’s already a few boost steps difference in the end!
So you can choose between 1500 and 1000 RPM for safe operation. The board never gets warmer than 66 to 69 °C even at the hottest spots, which is an excellent value. The noise development of the two eLoops is completely within tolerable limits at around 33 dB(A) at 1500 rpm. Of course, you can also consult the results of our fan tests and pick a fan that generates less static pressure, but a lot of airflow in the width at low sound pressure levels. There are quite a few candidates. I took the noise blockers because they are always lying around here in the lab and because they are white. This always stands out better in the half-light, but it also works better.
Summary and conclusion
I may already spoil that the basic concept also fits Ada and the RTX 4xxx. Since I know the Thermal Design Guide, I can reveal at least this much, that the holes are the same and only the voltage converters are a bit closer. But that would be a different story. As for RDNA3, the RX 7900’s mounting holes are absolutely inappropriate because the distance between the holes is way too big. It remains to be seen whether Raijintek will deliver a suitable, much wider bracket. It would be nice.
In terms of cooling, Raijintek’s really lightweight Morpheus proves once again that it’s not about the pure cooling surface, but primarily about the fastest and most efficient dissipation of waste heat. Here, a smart heat pipe system ensures that you can usually achieve better results despite less mass. The rest is taken care of by small but important details that make quite a difference in total. Not only can you buy it, you should buy it. At least if the price of the German end customer market, which is still to be determined, is not higher than that of a good water cooling system. And even they have increased in price utopian. Unfortunately.
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