5d mkiii buffer size relating to memory cards

Sorry if this has been asked before, but what are you getting for a buffer amount of pictures when using both cf and sd cards. I noticed while recording raw to cf and jpg to sd all best quality I am getting a buffer of 6 shots. If both on jpg it goes to 36. I am using a 32 gig 266x cf and 32 gig sd with a write speed of up to 35mb/sec. Also would going to a 600x cf card actually make a difference or is it for marketing?

Thanks

i just use the CF card as i get better performance from the buffer without an sd card in. i just imagine that it just isn't there

What are you getting for a number of shots in the buffer.

Transcend 600x cf card

Iso 100, 1/8000, f4 = 25 frames

Iso 12,800, 1/400, f4 = 16 frames

I don't use sd cards.

jase1125 wrote in post #14323097
Transcend 600x cf card

Iso 100, 1/8000, f4 = 25 frames

Iso 12,800, 1/400, f4 = 16 frames

I don't use sd cards.

So is there really a difference between a 266x vs 600x speed that is really noticeable?

skater911 wrote in post #14323125
So is there really a difference between a 266x vs 600x speed that is really noticeable?

Yes

And the tech between SD cards and CF cards are different.. CF cards are smarter, and move data in parallel ( like the old printers did )- multiple bits at a time. SD cards are a serial technology- they move bits one after the other. So, a CF card is the better performer due to its parallel nature.

I noticed a but of a slow down when using SD cards as well.

sorry if this sounds like a silly question. when writing to both cards (so SD as backup).. is the images size exactly the same on both the CF and the SD? ie: if i had both an SD and CF in there of the same capactiy, say 8GB.. would they fill up at the same rate?

i'm considering purchasing the 5d mkiii.

treat wrote in post #15033810
sorry if this sounds like a silly question. when writing to both cards (so SD as backup).. is the images size exactly the same on both the CF and the SD? ie: if i had both an SD and CF in there of the same capactiy, say 8GB.. would they fill up at the same rate?

i'm considering purchasing the 5d mkiii.

Yes the same size, but writing RAW to the SD card at the same time as a back up to the CF card slows down the CF card write speed to the slower SD card speed, so it pays to have the fastest writing SD card

treat, if you would write the same type of image to both cards, then you would not expect significant differences in the image or file size. In other words, a RAW image written to the CF card will be the same as the RAW image to the SD card. Most people however write the RAW to the CF card and JPEG to the SD card. Then of course the file sizes are different because of the differing formats.

Got it . Thanks guys.

I just picked up my new 5D last night - after posting the question. Been so busy, I had time to charge the battery last night and that was it. Not even sure i'll get to play once I get home tonight.

My intention is to write to SD card the same RAW file for backup. So given the original post - knowing the SD card has limited write speed, what's the fastest SD card write speeds I should be looking to purchase for use in the 5D?