Pegasus R3

  • Last Post 20 February 2018
Mark Giuliani posted this 06 January 2017

I currently have a Pegasus R6 using the original thudnerbolt 1 connection.  I am thinking about upgrading my MBP to take advantage of Thunderbolt 3 and purchasing a new Pegasus3 R6 or R8.  Some questions I have regarding the technology are related to throughput.  I understand that the original thunderbolt was 5Gb/second and the Thunderbolt 3 is 40Gb/s but what will I really see using Final Cut Pro.  The Pegusus family seems to be limited by the speed of SATA which is 6Mb/second.  Currently my MBP can achieve almost 1000MB/second read write performance on the internal drive according to the BlackMagic Utilty but the issue falls to storage space.  My Pegusus sees around 250/Mbyte per second.  What will a newer Pegaus R3 achieve in reality when it comes to R/W performance when SATA seems to be the bottleneck.  Are there advantages to using SSDs rather than conventional rotating drives? Are there plans to incorporate M.2 PCI drives  inside the Pegasus class devices?  I plan on using the device as a RAID 5 device.

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Venkatachalam Settu posted this 07 January 2017

Hi Mark,

Thank you for choosing Promise Technologies, Inc. for your storage needs. The Pegasus3 uses Tunderbolt3 Link with data bandwidth up to 2,750MB/sec.

Please find the Pegasus3 Performance details.

Thank you.

Albert Julve posted this 19 February 2018

Hi. I only get 1.150mb/s read and 1.300mb/s write in pegasus3 r8 32tb raid0 set up uising thunderbolt3 in iMac 5K 2017... stripe 1mb. Am I doing something wrong? All drivers and firmwares are updated.



Pradeep Chidambaranath posted this 20 February 2018

Hi Albert,

Kindly go to to register the product and create a support ticket with complete subsystem report and the Black Magic speed test results for further assistance.

Go to the below link to download the latest version of the utility.

Follow the below step to save the subsystem report for further investigation.

- Open Promise Utility.
- Click subsystem information icon on the top of the window.
- Click the lock symbol in the left bottom corner of the screen to unlock the utility.
- Click on save service report button to save the subsystem report.

Go to the below link to access the KB link to get the step by step instruction on how to upload the files to the support case.

Pradeep C