So, how fast of cards do we need?

Will the Lexar Professional 400x work?

Lexar 32GB Professional 400x Compact Flash LCF32GCTBNA4002 B&H

This is what i've been using with my 5d for years.

I'm getting 4 of these. First of all, I only shoot SanDisk. And with redundant recording, 64 and 128gb cards are now an option. With 4x 64GB that's 340 minutes of redundant recording.

SanDisk 64GB Extreme Pro CompactFlash Card SDCFXP-064G-A91 B&H

Bellow is a chart with supported cards.
But I guess any UDMA CF card with more then 45MB/Sec should work.

I'm going to use

1x Transcend CompactFlash Ultimate Card 600x, 32GB
4x SanDisk Extreme Compact Flash, 400x, 60MB/s, 32GB

I think it is best to refer directly to Canon's EOS C300 FAQ.

Canon DLC: Cinema EOS Frequently Asked Questions (http://learn.usa.canon.com/resources/misc/cinemaEOS_faq.shtml)

Clearly, the Sandisk CF cards are the only ones that have been thoroughly tested and support overcranking.

Cheers,

This thread hasn't been updated in a while and I was just second guessing myself so I thought I'd craft a post here about it.

This is my main question:
Does this work for all frame rates on the C300: SanDisk 64 GB Extreme MFR # SDCFXS-064G-A46?

Not recommended for all frame rates on C300:
Delkin Devices 64GB CompactFlash Memory Card 700x UDMA: about $75
MFR # DDCF700-64GB
64GB Data Storage Capacity 700x Speed Rating
Read Speed: 105MB/s
Write Speed: 67MB/s
UDMA 6 Compliant Made in the U.S.A. Lifetime Warranty

Recommended for all frame rates on C300:
Delkin Devices 64GB CompactFlash 1000x UDMA Memory Card: about $99
MFR # DDCFCOMBAT1000-64GB
64GB Data Storage Capacity 1000x Speed Rating
Read Speed: 150MB/s
Write Speed: 80MB/s
UDMA 7 Compliant Supports Rapid-Fire RAW Shooting

Recommended for all frame rates on C300, but pricey, there is an offload speed benefit to these cards though…
SanDisk 64GB Extreme Pro CompactFlash Memory Card (160MB/s): about $150
SDCFXPS-064G-A46
64GB Storage Capacity Optimized for 4K Video Recording
Up to 160MB/s Read Speed
Up to 150MB/s Write Speed

Does this work for all frame rates on the C300?
SanDisk 64 GB Extreme CompactFlash Memory Card: about $90
MFR # SDCFXS-064G-A46
64GB Storage Capacity
Read Speed up to 120 MB/s
Write Speed up to 85 MB/s
UDMA 7 Compliant

Additional options (Toshiba / Transcend)

Toshiba EXCERIA Flash memory card - 64 GB CompactFlash
MFR# PFC064U-1EXS
1000X / 120MB/s write

Transcend 1000 X look good at 32GB and above, that 16GB is slower.
MFR # TS64GCF1000
Read 160 MB/s, Write 120 MB/s (32~128GB);
Read 160 MB/s, Write 70 MB/s (16GB)