50D writimg speed ~20 MB/s

[Jayorich]

Hey Guys,

i'm new to the forum but i've been using Magic Lantern for a while now. At first on my 600D and now on my recently bought 50D. When i first recorded a RAW video on my 50D
i've noticed, that it runs very fast out of buffer and the video stoped after about 10 seconds. I then checked my settings but everything seemed ok (1280x720, 24 frames/sec).
I'm using a SanDisk Extreme 60 MB/s UDMA 32 GB CF Card. A little bit confused i ran a benchmark test on my CF Card on Magic Lantern and was shocked. I only can get up to 19 MB/s. I tried another card = same result. So what am i doing wrong 
I also re-installed Magic Lantern and tried older and newer versions, but no success.

[Midphase]

Looks like the CF card you're using is rated at 400X.

You might need to buy a faster card, like 800X or faster.

Forget about the "read" speed, the write speed can be substantially slower.

Also, you want to make sure Global Draw is OFF.

[Walter Schulz]

Objection, your honor!
I use the same card on 7D and write rates are nearly three times higher.
If you have a decent USB 3.0 cardreader you should run something CrystalDiskMark and/or ATTO. If your card fails again you have a faked card.

Ciao
Walter