Review on 💻 Sedna PCIe Dual 2.5 Inch SATA III SSD Adapter (Extended Single Side Version) - Built-in Power Circuit, Mac Compatible (SSD/HDD Not Included) by John Larsen

Due to the fact that the information on the various strings was placed in the Revain publication, it did not appear before I made the purchase. HUGE VS: PCIe Gen 2 x1 (again on different lines) Meaning: It advertises support for 2x SATA 6Gb/s drives, but what you actually get is MUCH LOWER! Context: you're always going to have overhead, so your BEST 6Gb/s SATA SSD will be around 550MB/s out of 600MB/s theoretically. Maxim, so you think that x2 with this card? NO! For some reason, instead of Gen3 x1 or using Gen2 2x, it's a PCIe Gen 2 x1 connection, theoretically capped at 5Gbps or 500MB/s. Now add the overhead and you get 400MB/s MAXIMUM AT ONE or even LESS, split between the two. Test setup: 2x 256GB Samsung 840 Pro SSD, individual speed direct to SATA is about 480-500MB/s READ and 430-460MB/s WRITE, good! Now if you have both plugged in and installed the latest mid 2020 drivers (older versions have also been tested) you will get a MAXIMUM speed of 400MB/s on ONE of the drives, if you try to use BOTH at the same time one of them will drop to 125 MB/s with. and another 250 MB/s (tested multiple times, with different drivers and different SSDs, that's a literal imbalance situation) or about 375 MB/s, so it drops even lower during testing, even BELOW TESTED 400 MB/s with one disc. The culprit is the chosen controller, the ASM1061, a PCIe Gen2 x1 channel, a 2010 chip that Sedna still makes today. and use in several of their other products. Bottom line: if you want to use this with an SSD or SSD, DON'T STAY AWAY, RUN FURTHER should be fine for a regular HDD, as generally even on 2020 HDDs you won't go above 250MB/s before the cache is exhausted .