Some 15 years ago before appearance of heatpipe coolers Zalman was at top in heatsinks, but then others left them in the dust in performance per noise.
And they never recovered from that, continuing designing their heatsinks primarily for fancy looks instead of functionality.
So no wonder if sales "tanked".
I mean their "ultime fanless cooler" for its huge bulk looses even to Intel's chronically undersized stock heatsink: https://www.hardwaresecrets.com/zalman-fx100-cpu-cooler-review/7/
Now that's achievement in bad design itself!
FX70 at least tones down lot on that hype using conventional design.
That very loose fin spacing should work well for full passive use.
Attaching was just designed as after thought: https://youtu.be/hLPWCf98nxw?t=35s
Not going to be easy to turn those screws for good mounting pressure.
And if you want to attach fan there's likely going to be memory clearance issues, while fanned performance isn't that great for quite huge size: https://www.gamezoom.net/artikel/Zalman_FX70_Test_Review_Exklusiv_-30714-2
Some Thermalright Machos would likely do better and be free from memory clearance issues.
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