Dynatron A39 - A Good Heatsink For Threadripper/EPYC 4U Systems

I've been running the Dynatron A39 heatsink within a Rosewill 4U enclosure for a server based on the ASRockRack ROME2D16-2T Milan-compatible motherboard with AMD EPYC 75F3 processor.

The AMD EPYC 75F3 is a 32-core / 64-thread processor that at the top-end of their frequency optimized SKUs in the Milan family has a 2.95GHz base clock with 4.0GHz boost clock while having a 280 Watt TDP. With having a 280 Watt TDP like the EPYC 7763, it works great for testing this Dynatron A39 heatsink and ensuring it can meet its top-end claims.

For the performance figures in this article, the Dynatron A39 was tested against the Dynatron A38 and Noctua NH-U9 TR4-SP3 dual-fan heatsinks for reference on this AMD EPYC 75F3 server running Ubuntu Linux.

Over the course of 9 hours, a wide variety of system benchmarks were carried out for stressing the system while the Phoronix Test Suite was monitoring the CPU core temperature every one second.

Long story short, the Dynatron A39 heatsink was working out very well for cooling the 280 Watt AMD EPYC 75F3 Milan processor... Over the course of the nine hour stress test, the Dynatron A39 led to a measurably lower CPU core temperature than the smaller Dynatron A38 or the Noctua NH-U9 TR4-SP3 dual-fan heatsink.

The Dynatron A39 fan noise is similar to that of the smaller 60nm fan on the Dynatron A38 while both are noisier than the Noctua heatsink even in a dual-fan configuration, but still if you are using the A39 in a SOHO server or even Threadripper workstation with PWM the fan noise is manageable.

Pricing on the Dynatron A39 was around $50 USD, which is a fair price and similar to other retail EPYC/Threadripper heatsinks. If in need of a 3U/4U active heatsink for a high performance EPYC or Threadripper server/workstation, I'm happy with the Dynatron A39 since picking it up about a month ago.