ACASIS 80Gbps M.2 NVMe SSD Enclosure, with Cooling Fan, Compatible with Thunderbolt5/USB4 V2.0, Back Compatible with Thunderbolt4/3/USB4 V1.0, USB3.2/3.1/3.0, Support SSD B+M M-Key (TB501 Pro)

So Im using this on a Mac Studio M3 Ultra, the base one with 28/60 cpu/gpu cores and thunderbolt 5 120Gbps. The internal 1TB drive hits around 6000-6500 MB/s in real world use and it was an extra $400 for only 1TB more. So I bought this and a 4TB Samsung 990 Evo Plus ($250). With this I get around the same speeds, a tiny bit less, than the internal NVMe for a little over $500 for 4TB instead of +1TB for $400.Haven't noticed any issues with it getting too hot or being noisy. Just make sure to put the thermal pad on it that comes with this and it was easy to install the NVMe since it doesn't require any tools. Highly recommend but I wish someone made an enclosure with the full 120Gbps speed instead of just 80Gbps but it basically maxes out PCIE 4 x4 NVMes so that works for me.

Speed test Apple iMac 2019 Thunderbolt 3 Sequoia 15.3.2 -- Compare new ACASIS 80Gbps TB501 Pro vs 40Gbps TBU405 PRO read write IO -- I have three TBU405 PRO I purchased new on Amazon and love the speed and reliability I get off them through TB3 -- I bought the latest TBU405 PRO and ran AJA System test -- I used the same newer WD BLACK SN850X 2TB SSD NVMe 2 in both enclosures.See my photos:the older 40Gbps TBU405 PRO gave me the familiar 2593Mbs write and 2736MBs readthe new 80Gbps TB501 PRO gave me dismal 900Mbs write and 900MBs readConclusion:Unless you have Thunderbolt 5 hardware on a Mac computer -- stick with the TBU405 PRO -- I saw some vague reference to this Thunderbolt 3-4 disclaimer in the ACASIS product description but it wasn't conclusive -- hope this real world test answers the question for you -- TB3 (and probably TB4) run at 10 Gbps speeds on the Apple Macintosh Computer 2019 iMac I tested (just like the ACASIS TB501 Pro product description says).In other words:the new 80Gbps TB501 Pro is a Thunderbolt 5 ONLY enclosure if you expect full TB5 speeds and reliability -- it only delivers 10 Gbps speeds on TB3 and TB4 hardware.My three TBU405 PRO enclosures all get the crazy good speeds in my screenshot -- except for Samsung which is slower in the external enclosure, but the Samsung 970 EVO PLUS M2 SSD gets the crazy good speeds installed internally -- the WD BLUE and WD BLACK NVMe drives give me the best sustained speeds I've tested on macOS in these TBU405 PROs -- not sure how reliable the Western Digital SSD are in the long run, I do have the most confidence in the Samsung, but I only use them internally now as Samsung tech support say their NVMe PCIe M.2 SSD are for internal use only.Blackmagic Disk Speed Test app gave similar results

This product looks slick and is very easy to install, but that is where the good things end. The first issue was the SSD that I installed was running incredibly hot. Underload it was getting up to 78°C. That is with both of the included thermal pads installed. It would stay a tiny bit cooler if I manually turned on the fan, but it was still about 75°C, which is about 10° over what is supposed to be the recommended operating temperature.I contacted support via email not through the Amazon app, and the first person told me I should purchase some more thermal pads and try those, and when I said that I shouldn't have to be buying extra stuff for this to work properly a second person essentially told me the same thing. I decided to return the item and someone from the Amazon part of the support team contacted me and tried to get me to keep the item and get a parcel refund and they would send me some additional thermal pads. The issue is that the thermal pads are not gonna help the automatic fan from turning on and even so it was running way hotter than one would expect.. I ended up getting the U-Green 80 GB enclosure and it is world's better so far. Under load I have transferred over 1.2 TB of data with the max temperature reaching 58°C.

Excellent external drive - quiet fan, solid build, tool-less design, etc. comes with a short TB5 cable (perfect length for me). Using a WD Black SN850X 4TB and seeing average read/write speeds of 5800 pretty much matching Apple internal memory of 512 MB on Mac Studio M4 Max base model. Only nit I have is the thermal pads supplied (1mm and .5mm) need to be sandwiched together and both used - I just bought some 1.5mm Arctic Thermal pads and used that - didn’t like sandwiching two pads together and having that connection between the two pads in addition to the top of the ssd. Anyway, highly recommend if you can find this on sale and can’t wait for TB5 enclosure prices to come down.