USB3 vs. SATA (i.e. SATA3) Disk Performance Comparison

[magellan]

This article from Flexense measured the performance of the same SSD (Samsung 850 PRO 512 GB SSD) connected via USB3 and SATA3. Surprisingly the SATA3 performance is noticeably better in the benchmarks used.

https://www.flexense.com/usb3_vs_sata_disk_performance_comparison.html

 

[EarthDog]

Can't say I'm surprised. Base usb 3.0 with a the overhead versus sata3 6gbps...

 

[magellan]

Since USB 3.0 is only capable of 5 Gib/s it only makes sense it would be slower than SATA3 at 6 Gib/s.

USB 3.1 gen. 2 would be faster than SATA3 though right?

 

[EarthDog]

USB 3.1 gen. 2 would be faster than SATA3 though right?

See your other thread. lol

 

[magellan]

I read this thread before that one so I didn't see the breakdown before I replied.

 

[Woomack]

USB can be faster than SATA in sequential bandwidth but won't be in low queue random operations. It's just not possible to make SATA SSD run via USB at more than ~550MB/s.
I'm not sure why you compare old standards while every new motherboard (or even 4-5 year old) supports USB devices at 500MB/s+, and often at 1GB/s+. If they couldn't make 500MB/s+ via USB then clearly the way they connected it was limiting the bandwidth.