If a card were to work with Red, it would need to advertise and deliver a sustained write speed of about 40 MB/s.
Based on the thread I thought it was too obvious to mention, but thanks for pointing it out. Tested speed in the right environment (i.e. inside the CF module on a RED One) is what we need to know, hence why I posted the question to see if anybody knew anything more about the STEC MACH4 CF card. I still think the fact that the manufacturer is LISTING speeds (55 write/ 90 read) which translates to about 600x read and 367x write is an ok start...
Oh, and I was looking at the 16GB SLC version. Don't have much hope for the MLC version...
Would prefer the RED 16GB card, of course. Just looking for backups.