SD Overclocking - DIGIC 5 only

[Danne]

89Mb/s. That is very high numbers. You're lowering sampling affected recording times a lot?

[Jip-Hop]

I conducted the max data rate benchmark (green, orange, red) as suggested by gabriielangel.

Like gabriielangel I used a variable ND filter. However I chose to do the benchmarks in the 5.2K 1x3 preset with 2.35:1 aspect ratio. All tests were done in 14 bits.

I used the magiclantern-crop_mood.2024Feb19_Custom.EOSM202 by danne for my tests.

The results for the Lexar Silver Plus mSDXC UHS-I 1TB R205/W150 are as follows (using 240MHz / SDR50).

1) Max Red Speed: 93.49 MB/s
2) Max Orange Speed: 91.43 MB/s
3) Max Green Speed ("Continuous"): 81.75 MB/s

These results are a bit lower then the ones gabriielangel posted for the Lexar Silver Plus mSDXC UHS-I 256GB when testing 2.8k/14bits.

With these max speeds as baseline I tested a few settings to see if they impact the max data rate. I did not find these settings to impact recording times:

- Sound Recording (On/Off or lowering sampling rate)
- Shutter fine tuning (to achieve 180 degree shutter)
- Powersave in LiveView -> Dim display -> after 5sec

I was surprised regarding sound not having an impact... When disabling sound I was not able to improve on the previously established red/orange/green baseline. Disabling sound did not allow me to increase exposure and still meet the requirements to meet the red/orange/green benchmark.

My test with shutter fine tuning enabled (and compensating for the difference in exposure) would match the baseline. Same exposure value as measured by the histogram before and after enabling shutter fine tuning would satisfy the red/orange/green requirements.

[Jip-Hop]

A quick test trying to find the green data rate when testing the above card with 2.8k/14bits results in about 78.87 MB/s which seems to imply the 1TB version of this card is slightly slower than the 256GB version.

[Jip-Hop]

Sandisk Extreme Pro SDXC 95MB/s V30 UHS-I U3 256GB

Benchmarked in the 5.2K 1x3 preset with 2.35:1 aspect ratio. Red and orange at 14 bit and dropped to 10 bit for green.

1) Max Red Speed: 85.17 MB/s
2) Max Orange Speed: 82.73 MB/s
3) Max Green Speed ("Continuous"): 72.45 MB/s

Which means my new Lexar 1TB card is about 8.78 MB/s faster than this one.

[gabriielangel]

Thanks for taking the time Jip-Hop.
I tested SanDisk Extreme Pro SDXC UHS-I Memory Card 95 MB/s 128GB here
And got results similar to yours. A 8.78 MB/s difference is still a huge deal!
So I guess it is better to get a few smaller sized cards rather than a single 1TB.
I have recorded about 2TB worth of footage with the Lexar Silver Plus 256GB. No corrupted frames or issues so far.

[Jip-Hop]

The results for the Lexar Silver Plus mSDXC UHS-I 512GB R205/W150 are as follows (using 240MHz / SDR50).

1) Max Red Speed: 93.45 MB/s
2) Max Orange Speed: skipped benchmark
3) Max Green Speed ("Continuous"): 81.41 MB/s

These results are on par with the 1TB version of this card.