Some people posted that sometimes the slow benchmark results of around 750 and 2 lanes instead of 4 come up because: I did some research and it seems like there's no way of getting the iMac to use 4 lanes, right? I checked the lanes, 2 lanes instead of the transcend's offered 4lanes. When I saw the transcend ssd Benchmarks I was pretty much ****ed up because I was expecting much higher R/W scores. seriously guys, benchmarks where not even close to 100 for reading/writing xD xD xD Is an iMac SATA HD really that slow normally? I also checked the SATA 1TB built in benchmarks and. I ran several benchmark tools and all of them came up with 700 to 750 for both, reading and writing.

I bought a cheap NVMe PCIe M.2 NGFF SSD 2013 2014 Adapter on eBay for connecting the transcend to the PCIe slot on the logicboard. Yesterday I added a NVMe 1.3 PCIe SSD transcend 220s (DRAM cache version) to the built in 1TB SATA HD.

I recently upgraded the ram from 2x4GB to 2x8GB, iMac is working perfectly since then (maybe for 4 weeks + almost 24/7 turned on). I got me a late 2013 iMac 21.5 a couple of months ago pre owned from eBay.

Apple imac 27 late 2013