MP 6,1 External ssd on a 6,1

[pierre1610]

I’ve been using a usb 3 caddy and a bx500 crucial 1tb drive. Recently it’s really got slow, sometimes dropping to 5MB/s which is entirely useless. I want to replace it with 2tb. What are my options? Usb3 doesn’t support trim so I’m wondering if that’s why it’s so slow.

Obviously I’m limited to tb2 or usb3, I want 2tb, ideally at least 500MB/s

What I don’t understand is why drives are always so much slower when external, even systems running 2x m.2 in one enclosure in tb3 are way lower than a single m.2 drive on an internal PCIe ssd. I don’t understand why when tb3 is 40Gb/s

 

[MikkelAD]

I’ve been using a usb 3 caddy and a bx500 crucial 1tb drive. Recently it’s really got slow, sometimes dropping to 5MB/s which is entirely useless. I want to replace it with 2tb. What are my options? Usb3 doesn’t support trim so I’m wondering if that’s why it’s so slow.

Obviously I’m limited to tb2 or usb3, I want 2tb, ideally at least 500MB/s

What I don’t understand is why drives are always so much slower when external, even systems running 2x m.2 in one enclosure in tb3 are way lower than a single m.2 drive on an internal PCIe ssd. I don’t understand why when tb3 is 40Gb/s

Take a look around I this thread

Mac Pro (Late 2013) | Dual NVMe RAID-0 startup possible?

I have a Mac Pro (Late 2013) [MacPro6,1] with Intel E5-2697v2 2.7GHz 12-Core CPU, 1TB Apple SSD, D500x2, and 128GB of RAM. To speed up this Mac, I am wondering if it is possible to do the following: (1) Find a dual NVMe enclosure with Thunderbolt 3 interface. (2) Install two identical 1TB NVMe...

forums.macrumors.com

 

[DFP1989]

A big part of your problem is you're using a cheap drive with no DRAM cache. Reviews of that drive are pretty poor.

The way I understand it, 40Gbps is the theoretical top speed of Thunderbolt 3, once you take into account overheads and other latencies it's likely to be less.

A decent NVMe drive in a Thunderbolt 3 enclosure will work well, though you'll need to pick up the Apple Thunderbolt 2 to 3 adaptor.

 

[DRDR]

And it will need its own power supply. I would recommend getting an external PCIe TB3 enclosure and to put an NVMe drive inside.