I received my RD6018 power supply as a complete kit incl. the Riden (NVVV) S800-65 (12.3A) SMPS internal power supply (PCB dated midst of June 2020) + dedicated case a few days ago as sold by Banggood (kit) for the RD6018. The kit contained this "standard-"SMPS
https://de.banggood.com/RIDEN-RD6018-RD6018W-S-800-65V-Switching-Power-Supply-AC-or-DC-Power-Transformer-Has-Sufficient-Power-90-132VAC-or-180-264VAC-to-DC65V-p-1750643.html?cur_warehouse=CN&rmmds=detail-top-buytogether-autoAfter delivery I opened up my SMPS for doing that (Youtube) documented "hack" (video part 3) to have it run at almost "full power" for longer periods of time without stated problems (destructing itself). NOTE: This "hack" consists of replacing the one installed MUR3060PT with two of the same kind in parallel, because the Avalanche dual diode's junction temperatures got supposedly very high (> 150°C (?) derating above 120°C, actually to high) during his tests (review) and finally had been killed by this (died) after about an hour. He tested this with another (second) part of same type but got the identical result. Because of this he then substituted two of those dual diodes for the one supplied, because the PCB and the corresponding heat sink had already the needed provisions for this (2 in parallel, actually max. 4 in parallel) without any further problems as stated. Although there are 4 mountings positions available, he chose just 2 because of the capacitance of the fast switching diodes (150 pF ? each part) might become a problem at the given switching frequency (Youtube video "Riden RD6012 Part3" by Jerry Walker).
I found the solder quality on my Riden SMPS to be rather poor, one leg of a resistor hadn't even been soldered to the PCB (must have been overlooked during assembly), which I fixed too. I therefore doubt that all units (100%) have been tested according to this. My newer SMPS version has slightly less power (12.4 => 12.3A) and seems to be a slightly modified version of the original 70V (now 65V) one. The capacitors used are - supposedly - from a Huawei company (Chang, standard LP series) and are specified for 2.000h (at 85°C) and mixed 85°C and 105°C. I doubt if they are current types, because I couldn't find the exact type during my search in the Chang product portfolio (
http://www.huaweiec.cn/Uploads/LP.pdf). The SMPS unit as a whole at least is of rather "questionable" (mediocre) quality concerning the parts choice and quality (especially the brand choice, temperature specs and expected lifetime of electrolytes used) as the "weak link" plus the cabling enclosed with the original S800 casing.
Most Chinese SMPS are quite noisy too, although mine seems to cut off the fan at low power / standby now as stated already elsewhere, older versions of this power supply don't seem to do this. Hottest part seem to be the heatsink with the "ultra fast" switching diodes close to the front of the unit, but the existing temperature sensor doesn't seem to be close enough to these elements although ist had been bent into that direction already. The air flow of the built-in fan seems to be somewhat hampered by the design of the air outlet(s), which I modified too.
Unfortunately there are only a few high voltage + high amperage SMPS units on the market, which fit the casing. To my knowledge these are (almost ?) all of Chinese origin. Dave Jones, if I remember correctly, got another (Meanwell) SMPS, because the one he ordered was cancelled. Unfortunately the Meanwell SMPS does "only" 48V for his 1000Watt unit.