Sidebar Sidebar
Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.

Mac Studio Ultra front port speed slowdown

bitnaut

bitnaut

macrumors member
Original poster
May 10, 2014
44
35
I have the base Mac Studio Ultra with 20 CPU, 48 core GPU, and 64GB ram and have been quite happy with its performance. As of yesterday, however, transferring my photos from a Sony MRW-G2 dual SD/CFExpress Type A card reader has dropped from a wonderful 250-300MB/s to 30MB/s.

The only driver thing I installed lately was the Sony Camera Driver which was needed to upgrade my Sony A1's firmware. Thinking this may have been the problem, I uninstalled this driver today, shutdown, rebooted, and re-tried my photo transfer...still 30MB/s.

So I plugged the Sony card reader into the rear TB ports and, voila! 250-300MB/s transfer speed once more!

As a further experiment, I have a TB3 NVME enclosure that gets 1500MB/s Write and 2600MB/s Read on the rear TB ports. I switched it to the front TB port and Mac Studio/macOS no longer recognizes the drive. It's almost like the front ports are no longer considered TB ports.

WTH?

I've tried resetting the NVRAM and still to no avail. How do I get my front port speeds back? Is this an Apple Genius problem?
 
i get the same speeds on my ultra both front and back.
sounds like you have a hardware problem.

bring it in to apple for a repair/exchange while you're in the warranty period.
 
Update: Brought my Mac Studio Ultra to Apple Genius. They tested and confirmed that the front ports were not operating at same speed as rear ones so they’re putting in a new motherboard. Hopefully I get it back soon. 😑

Final update: Apple was unable to fix my machine so they just gave me a new one. :cool:
 
Last edited:
  • Like
  • Love
Reactions: T'hain Esh Kelch, cpnotebook80 and lcubed
Just got my Xmas gift - apple gift cards put towards the m1 ultra. I did try this and with my Acasis TB3 ssd and both back and front ports are fast speeds. The only issue so far is the hdmi to my monitor (benq sw271) the resolution kinda went down over night. Just reset the hdmi cable and was back to regular rez.
 
bitnaut said:
I have the base Mac Studio Ultra with 20 CPU, 48 core GPU, and 64GB ram and have been quite happy with its performance. As of yesterday, however, transferring my photos from a Sony MRW-G2 dual SD/CFExpress Type A card reader has dropped from a wonderful 250-300MB/s to 30MB/s.

The only driver thing I installed lately was the Sony Camera Driver which was needed to upgrade my Sony A1's firmware. Thinking this may have been the problem, I uninstalled this driver today, shutdown, rebooted, and re-tried my photo transfer...still 30MB/s.

So I plugged the Sony card reader into the rear TB ports and, voila! 250-300MB/s transfer speed once more!

As a further experiment, I have a TB3 NVME enclosure that gets 1500MB/s Write and 2600MB/s Read on the rear TB ports. I switched it to the front TB port and Mac Studio/macOS no longer recognizes the drive. It's almost like the front ports are no longer considered TB ports.

WTH?

I've tried resetting the NVRAM and still to no avail. How do I get my front port speeds back? Is this an Apple Genius problem?
Click to expand...
just curious. how did you test your speeds?
 
I tested with Blackmagic Design’s Disk Speed Test and attaching a USB-C/3.1 enclosure with NVME SSD inside.
 
You must log in or register to reply here.
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.
Top Bottom
Back