Caldigit dock TB pass thru slows next device down

propower

macrumors 6502a
Original poster
Jul 23, 2010
719
112
I got a Caldigit Thunderbolt dock and daisy chained a Blackmagic Multidock from it with a Samsun 840 pro 512G drive in the BM. The BM dock is a SATA II device.

I tested the BM directly connected to my imac and speeds are:
345MB/s - 380MB/s W/R

When I daisy chain off the Caldigit (with nothing else in the Caldigit) I get
250MB/s - 325MB/s W/R

Any one else finding slowdowns when daisy chaining TB devices??
 

paulrbeers

macrumors 68040
Dec 17, 2009
3,960
120
I got a Caldigit Thunderbolt dock and daisy chained a Blackmagic Multidock from it with a Samsun 840 pro 512G drive in the BM. The BM dock is a SATA II device.

I tested the BM directly connected to my imac and speeds are:
345MB/s - 380MB/s W/R

When I daisy chain off the Caldigit (with nothing else in the Caldigit) I get
250MB/s - 325MB/s W/R

Any one else finding slowdowns when daisy chaining TB devices??
You are sharing bandwidth and with the cal digit dock having video it's probably using a lot of bandwidth.
 

HenryAZ

macrumors 6502a
Jan 9, 2010
615
98
South Congress AZ
I got a Caldigit Thunderbolt dock and daisy chained a Blackmagic Multidock from it with a Samsun 840 pro 512G drive in the BM. The BM dock is a SATA II device.

I tested the BM directly connected to my imac and speeds are:
345MB/s - 380MB/s W/R

When I daisy chain off the Caldigit (with nothing else in the Caldigit) I get
250MB/s - 325MB/s W/R

Any one else finding slowdowns when daisy chaining TB devices??
I currently have this chain:
Macmini (2011) -> Caldigit dock -> Areca TB drive array -> displayport monitor

I have an 840 Pro (128 GB) in the Areca array as a pass-through drive, and it registers 385w/495r. I have not tested it without the Caldigit dock in the chain, however.
 

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