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JNavas
WWAN
Posts: 688
Registered: ‎08-07-2010
Location: US
Views: 764
Message 1 of 2

Realtek PCIE Card Reader POOR SPEED (T460p)

Integrated Realtek PCIE Card Reader (RTS522a) is slow both reading and writing SanDisk Extreme 64GB UHS-I/U3 SDXC Memory Card (capable of 90 MByte/s read speed):

 

Warning: Only 1024 of 60874 MByte tested.
Test finished without errors.
You can now delete the test files *.h2w or verify them again.
Writing speed: 19.6 MByte/s
Reading speed: 20.7 MByte/s
H2testw v1.4

System: ThinkPad T460p with Windows 8.1 Pro x64.

Uninstalling and reinstalling drivers did not help.

Is this just a limitation of the Realtek device, or is there a possible solution (short of using an external USB 3.0 reader)?

Thanks! 

John ~ ThinkPad T460p
[ Win8.1Pro64 | i5-6440HQ | 16GB | 1TB SSD | WQHD | 802.11ac | BT | Cam | FR ]
JNavas
WWAN
Posts: 688
Registered: ‎08-07-2010
Location: US
Views: 712
Message 2 of 2

Re: Realtek PCIE Card Reader POOR SPEED (T460p)

With a ​SanDisk Extreme Pro USB 3.0 reader​ I'm able to get Windows large file copy speeds of 30 MB/sec write, 85 MB/sec read. But a great deal more testing has shown the problem to be complex. I've now been able to get performance from the integrated Realtek reader that almost matches the SanDisk reader. And I've seen cases where performance of the SanDisk reader drops to the same low level as the integrated Realtek reader. Performance seems to be affected by whether I Eject media with Windows before removing it, with better performance after ejecting and then reinserting. I speculate that Windows may not properly negotiate high card speeds under some conditions.
John ~ ThinkPad T460p
[ Win8.1Pro64 | i5-6440HQ | 16GB | 1TB SSD | WQHD | 802.11ac | BT | Cam | FR ]

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