Forgot Password
Pentax Camera Forums Home

Show Printable Version Search this Thread
04-03-2015, 05:51 AM   #1
Site Supporter
Site Supporter
Nickrs's Avatar

Join Date: Oct 2013
Location: "The Green Desert"
Photos: Albums
Posts: 174
Flu Card Write/Read speed on a K3


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.


Last edited by Nickrs; 04-03-2015 at 10:22 AM. Reason: remove blank space
04-03-2015, 09:31 AM   #2
Site Supporter
Site Supporter

Join Date: Mar 2012
Location: Perrineville, NJ
Posts: 1,372
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
Site Supporter
Site Supporter
Nickrs's Avatar

Join Date: Oct 2013
Location: "The Green Desert"
Photos: Albums
Posts: 174
Original Poster
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.

  • Submit Thread to Facebook Facebook
  • Submit Thread to Twitter Twitter
  • Submit Thread to Digg Digg
Tags - Make this thread easier to find by adding keywords to it!
32gb, card, dslr, flu, flu card write/read, k-3, k3, pentax k-3, samsung, sd, sd card, usb3
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Similar Threads
Thread Thread Starter Forum Replies Last Post
SD card speed on a K3 kshapero Pentax K-3 11 01-17-2015 10:14 PM
K3 + Grip + Flu Card - $827.00 rgknief60 Pentax Price Watch 2 11-29-2014 11:41 PM
K3 and Flu-card - image transfer boxcam78 Pentax K-3 4 07-07-2014 01:33 PM
K3 Battery Grip & Flu Card Wheatfield Pentax K-3 6 12-14-2013 12:58 AM
k10d read/write speed? silent_eyes Pentax Camera and Field Accessories 3 09-20-2008 04:03 PM

All times are GMT -7. The time now is 11:21 PM. | See also:, part of our network of photo forums!
  • Red (Default)
  • Green
  • Gray
  • Dark
  • Dark Yellow
  • Dark Blue
  • Old Red
  • Old Green
  • Old Gray
  • Dial-Up Style
Hello! It's great to see you back on the forum! Have you considered joining the community?
Creating a FREE ACCOUNT takes under a minute, removes ads, and lets you post! [Dismiss]