tbwnm wrote: ↑Thu Nov 23, 2023 12:04 pm
Speed test results (I ran the Black Magic Test for 15 minutes).
Thanks for running that. I was planning to write about the Acasis TUB405 today and your tests are a big help.
Yes, return the Envoy Pro FX. Your test should not have been that slow. The only explanations I can think of are a defective unit, defective cable (or one that didn't actually support TB3/USB4) since your test showed clearly that it was running over 2 Lanes instead of 4.
I, too, went with the Acasis TUB405 but not the Pro with the built-in fan. Please let us know if that fan adds any noticeable noise. If mine runs too warm, I'll kick it back to Amazon for an exchange—I've till Jan 31 to do so.
https://www.acasis.com/products/acasis- ... 9026804965
I wanted something that supported an 8TB blade – these tend to run HOT and not everything can handle that. Some enclosures tell you not to run the 970 EVO inside for the same reason. The Acasis TUB405/405Pro are supposed to be newly designed and bla, bla, bla so I'm taking the chance. Of the many USB 4 enclosures out there, I recommend avoiding all that give you a list of what drives not to install.
In addition to 8TB support, I also wanted a 4 Lane empty enclosure. The only empty TB3 enclosures I can find are the SABRENT Solid Aluminum Enclosure (EC-T3NS) and the OWC Envoy Express (that I bought and am planning to return) — both are only 2 Lanes, however. I'm not sure that 2800 brings that much more to a Sample drive but if using an external as a Project drive because you didn't buy enough internal storage, then yes, you want the full 4 Lane 2800 speed, IMO.
Lanes. I'll use round numbers since minor speed differences don't mean a thing. These are for one fast blade in a single blade TB3/USB 4 enclosure. These are the max speeds over the pipe (a TB3/4/USB 4 cable), not internally in a PCI bus. A USB 3.2 Gen 2x2 or slower cable will not give you these speeds nor will it support TRIM on a Mac.
1 Lane max 1000 GB/s — USB 3.2 Gen 2 (was USB 3.1)
2 Lanes max 1500 — TB2/3/4/USB 4 on a Mac; USB 3.2 Gen 2x2 (was 3.2) on a PC. Apple doesn't support USB 3.2 Gen 2x2
4 Lanes max 2800 - TB3/4/USB 4
In Multi-blade enclosures, each blade uses only a single Lane if quad-blade or 2 Lanes if twin-blade in a 4 Lane box — doesn't matter how many are installed. Marketing departments often lie about performance and claim 4000 (1000x4) when, in reality the max speed is 1000 as each will show up as separate drives (JBOD) unless… One must use RAID 0 to achieve speeds approaching those of a single blade enclosure.
HCMarkus wrote: ↑Thu Oct 26, 2023 7:57 am
Do not use RAID for VI Sample storage. The speed increase you see with RAID is for larger writes and reads; great for video transfer, but the many tiny reads VIs pull are actually
slowed by RAID.
My research suggests RAID is fine for backup redundancy, but is otherwise unadvised in audio applications.
I agree and partly disagree. Nothing wrong with RAID 0 for sample drives
if the enclosure supports RAID 0 in its firmware (they exist but are very expensive and none are available from OWC) and is properly backed up, preferably by multiple Time Machine backups that back up the entire system hourly. Macs with two NAND modules are configure RAID 0 according to Apple and the speeds show this. It's not necessary for Sample drives, however. RAID 1 is the same data on mirrored drives and should only be used for backup/restore since data access is slower.
I agree 100% that no one should using SoftRaid type solutions to create a RAID array—everyone I've spoken to who's tried that with Apple Silicon has had problems,
"But I don't want the 4 drives showing up as JBOD…" Sorry, that's the reliable solution — 1000 GB/s is pretty fast for a Sample drive and twice that of a SATA III SSD.
Back to the Acasis TUB405. These are USB 4, not TB3. So, while the components are not certified by Intel, it is a 4 Lane enclosure as the speed tests show. Also, it does not meet all of the TB specs and restrictions. What this means is that it's backward compatible to USB 3.2 Gen 1 (was USB 3.0) as advertised while TB3 is not. Just for kicks, I tried it with a USB Printer cable that supports USB 2.0/1.1 480Kbps) only and connected it to my 2012 MacBook Pro — and it works! I did not expect this and would certainly use a USB 3 (5000 GB/s) cable, the speed limit of that port, if I ever wanted to use that drive on that old MBP. Take a look:

- Acasis TUB405 on 2012 MBP.jpg (1023.15 KiB) Viewed 26971 times
Another advantage that applies to both TB3 and USB 4 is that TRIM is automatically enabled. It must be unblocked on 2.5" SATA III SSDs (500–550 GB/s) and then only possible in eSATA or Thunderbolt enclosures/docks.
As for the actual blades, There are slow (Crucial P2, Intel P1 rated 2000) and fast (everything rated 3100) NVMe 3 x4 m.2 blades. In a 4 Lane, single blade external housing, the fast will achieve 2800 speeds over TB3/USB 4 but the slow will not. The newer 4 x4 and 4 x6 blades will run no faster in an external—as the speed test showed—but they are backward compatible. Those super-fast speeds are for compatible PC motherboards. I'm not recommending against them, however, as TB5/USB 4.2 is on the horizon and that is expected to support a much faster, 6 Lane pipe. Apple uses 4 x6 NAND in the Studios with about 4600 speed in the single blade and 8000 in the twin blade versions.
Before anyone asks, if TB4 enclosures exist, I've not seen any. TB4 allows up to 5 TB3 devices to be attached to a single port on a Mac (4 on a PC) while the TB3 spec only allows up to two. It brings nothing else to the table on a Mac except higher charging voltages. TB4 enclosures are possible but they would have to also function as hubs and cannot be bus powered. Although daisy-chain is supported, bus power is not beyond the first device in the chain. The higher charging Voltage is why TB4 cables exist, however.