MP 7,1 Is it possible the 4TB Apple SSD is faster than the 1TB?

[rondocap]

In testing two different systems - the only difference between one has a 4TB Apple SSD in the 2019 Mac Pro, and the other the 1TB Apple SSD.

I thought they would be about equal, but I am consistently getting results around 100mb/s slower on the 1TB SSD, even with it not being very full at all. This is in both real world write/read to the drive, and Blackmagic/AJA benchmarks too.

Has anyone experienced any of this at all? It's not a huge difference, but certainly enough to have an impact on high bit rate footage export times like 8k 4444 XQ

 

[DFP1989]

Is it possibly due to having additional NAND chips to spread the load?

 

[glenthompson]

Is it actually a 4tb drive or is it 2 2tb drives in a raid 0 configuration? I thought I read that somewhere but may be wrong.

 

[DFP1989]

Is it actually a 4tb drive or is it 2 2tb drives in a raid 0 configuration? I thought I read that somewhere but may be wrong.

All except the base 256GB SSD are two blades linked together by the T2 chip.

 

[rondocap]

Is it actually a 4tb drive or is it 2 2tb drives in a raid 0 configuration? I thought I read that somewhere but may be wrong.

Yeah it is 2 2TB drives. The only one that is a single drive is the base 256GB one, which is slower

 

[jscipione]

Larger SSDs tends to mean more NAND chips which means more simultaneous access which results in faster transfer speeds. As others have stated the real divide here is 256GB to 1TB because 256GB is a single blade while the 1TB consists of 2x 512GB blades, the 2TB consists of 2x 1TB blades, the 4TB consists of 2x 2TB blades and the 8TB consists of 2x 4TB blades. Transfer speeds will go up but you'll get diminishing speedup returns past 256GB => 1TB upgrade.