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Having spent some time now with various different LP coolers, it's interesting to see where they stand in relation to each other specifically when tested on Ryzen in the HT5 and Lone L5:
- L9x65: supreme clearance compatibility, poor overall performance, poor noise performance due to A9x14, improves noise but not performance when fitted with 120mm adapter.
- L12S: good performance, good noise from A12x15, very poor VRM and RAM clearance. Underslung fan not so great for drawing in outside air from inside a case.
- L12 Ghost S1: decent performance slightly below L12S, average noise from either NF-B9 or NF-A9, mediocre VRM clearance. Hard to mount, spring-loaded screws don't want to "catch".
- Big Shuriken 3: good performance, good noise with A12x15, average VRM clearance. Basically has only 1 possible orientation, not centered over socket in either axis.
- AXP120-x67: good performance, good noise with A12x15, average VRM clearance.
Haven't tried yet:
- Black Ridge: interesting config but doubtful that cooling would be competitive with AXP120-x67 or BS3. Introduces completely unnecessary RAM clearance issues.
- L9a: allows use of Noctua FD-1 kit and possibly a NF-A9, but is objectively one of the worst coolers and sorely lacking in heatsink area and mass.
- IS-67-XT: comparable to AXP120-x67 and BS3, but nowhere to be found.
- Wraith Prism: yuck
Whatever ST heat density challenges are usually posed by Ryzen 3000-7000 are magnified on these LP coolers. Hottest temps are often achieved while running simple tasks (e.g. Windows update) on 1 or 2 cores, not all-core loads. On more capable towers or even larger downdraft coolers (ie. C14S), ST temps are usually not that high until per-core power draw reaches the 15-20W range. On the APUs this usually caps out at about 8-10W, but still enough to push some of the weaker coolers on this list to 80C Tdie and beyond.
Pretty sure you already know that but LP coolers are essentially classed by height and in quite small steps. Cases tend to have clearance of 40mm, 50mm, 70mm and then beyond that.
- L9x65 is 51mm. 66mm with the 92x14mm fan.
- L12S is 70mm. 120x15mm fan (under the heatsink).
- L12S Ghost S1 is 66mm. 92x25mm fan (under the heatsink).
- Big Shuriken 3 is 53mm. 69mm with 120x17mm fan.
- AXP120-x67 is 52mm. 67mm with 120x15mm fan.
- Black Ridge is 47mm. 92x15mm fan (under the heatsink).
- L9a is 23mm. 37mm with 92x14mm fan.
- IS-67-XT is 62mm. 67mm with 120x15mm fan.
- You probably meant Wraith Stealth, it is 54mm.
Performance follows the height and fan size. Everything you have tried is 70mm class. Black Ridge is 15-20mm lower. L9a is another 10mm lower than that (Intel counterpart L9i is or at least used to be even smaller).
Fan size matters (more than thickness). 120mm fan, even a LP one will outperform a 92mm fan, given that there is heatsink space to cool. For L12 Ghost S1 a 120x14mm fan should generally outperform the included 92x25mm one. For Black Ridge 120x14 fan will absolutely outperform the included 92x15mm one.
While I have tried L9x65, L12S and Big Shuriken, most of the time the cases have been narrower than that.
- Wraith Stealth does a good enough job in cooling but the noise is quite bad for what it does.
- L9a did a comparatively amazing job, same performance as Wraith Stealth but much smaller and much quieter.
- Then went to Cryorig C7 and later C7 Cu (basically for shits and giggles). Basically the same size as L9a and same-ish performance with same fan (included one obviously much worse than Noctua's). Cu did shave a few degrees off the temperature but was not exactly worth it.
- Tried quite a few other coolers but these did not leave a lasting impression.
- Now for the last 4-5 years have a A4 SFX, so Black Ridge was the obvious choice being built for that case. Switched the small fan for 120x14mm with all the mounting headaches and finding VLP memory but it was worth it. At the same time, even this does not really perform all too well in grand scheme of things. To keep the noise low - fan at max ~1250rpm my 5800X3D is running limited to 76W.