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04-03-2015, 05:51 AM   #1
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Flu Card Write/Read speed on a K3

Hi,

I had some time to spare last night so I decided to run a series of read/write speed tests on my motley collection of SD cards, the results are below. I was very disappointed with the reported performance of the Pentax Flu (16GB) Card, to be honest I only use the Flu Card when I want to tether as I find it a wee bit slow for normal use and this explains why.

The numbers at the end are the write/read speeds in megabytes per second that I obtained when testing each SD card with a program called H2testw. (The PC was an Intel i5 4570 CPU, 16GB RAM, 128GB SSD, USB3, Integral USB3 card reader). The numbers in brackets are the manufacturer claimed w/r speed.

Integral 16GB Ultima ProX (60/95) (black) 55/72
Samsung 32GB (orange) 16.2/57
Pentax Flu 16GB 17.8/21
Samsung 64GB (black) 35.5/63.3
Samsung 32GB (black) 35.2/60.3
Flashair 16GB 11.8/17.2
Integral 8GB Ultima ProX (90/95) 66.7/71.2
Integral 16GB Ultima ProX (60/95) (red) 52.5/70.9
Integral 32GB Ultima ProX (80/90) 66/71.2
Integral 8GB Class10 Basic 11.5/37.7

I might treat my self to a Sandisk card to add that to the comparison.

Nick




Last edited by Nickrs; 04-03-2015 at 10:22 AM. Reason: remove blank space
04-03-2015, 09:31 AM   #2
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When I first got the K3, I set it up for RAW+JPEG mode as usual, and put in a single 30 MB/s card in slot 1. That combination was waaaaaay too slow.

I switched some cards around, and now it is set up to write RAW to a Sandisk 45 MB/s card in slot 1, and low or medium resolution JPEGs to the Flu card in slot 2. The way I figure, there is no sense to transmit high-resolution images over wifi anyway. The overall speed is much better and I don't spend any more time looking at an hour glass icon. I haven't actually tried tethering with the Flu card yet, I just wanted to get the workflow sorted out first. If I start tethering, and transmitting images, then I will probably drop it down to the lowest resolution JPEG setting, which is fine for web use (the likely use case).

Anyhow, my feeling is, the K3 works fine with the Flu card in slot 2 for lower res JPEGs, but is way too slow as your only card, especially if you shoot RAW+JPEG. To be fair, the card doesn't claim to support the UHS-1 bus to begin with.
04-03-2015, 10:39 AM   #3
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Part of the reason I did the test was to find out in which of my SD cards was the fastest so I could use it for RAW files, currently I'm using the Integral32GB Ultima ProX (80/90) 66/71.2 for DNGs in slot 1 and the Integral 16GB Ultima ProX (60/95) (black) 55/72 in slot 2 for high quality JPGs. It's a good tip not to use the Flu Card for RAW files.
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