MP 6,1 NVME SSD - Speed Issues

[DotSlashShell]

Hi,
I have a 6,1 that came with an apple 512Gb SSD. I changed it out for a Samsung 970 Evo and this adaptor
Amazon.com: Sintech NGFF M.2 nVME SSD Adapter Card for Upgrade 2013-2015 Year Macs(Not Fit Early 2013 MacBook Pro): Computers & Accessories

I'm running Big sur and I'm writing at 400 MB/s and reading at 1200 MB/s.

Any ideas why its so slow writing? PCIE Link width says X4 5.0 GT/s

thoughts?

 

[panjandrum]

Because in the real-world, as with so much else, SSD write speeds are effectively just lies. I mean, they may be "technically accurate" for extremely brief periods of time, but those are not sustained write speeds due to garbage collection etc. My understanding is that SSDs may READ fairly close to their advertised speeds (assuming your interface and the computer itself is fast enough to handle those rates), but you'll never see one actually maintain the advertised write speeds over a sustained period of time, so it's basically a lie. Oh, excuse me, it's 'adversing jargon' (i.e. a lie). Still a lot better than HDDs though!

Enterprise Hard Drives and SSDs | Seagate US

www.seagate.com

 

[DotSlashShell]

I understand - but it seems like the NVME ssd is no faster than the Mac SSD.

 

[DotSlashShell]

UPDATE: I changed my ram out (Upgraded capacity) and for some reason both the Apple SSD and the 970 EVO NVME both are reading/writing at 1,300 each.

Bizar...