How fast is your RPi sdhc card

[#1]

Raspberry pi SDHC Card Tests
http://elinux.org/RPi_SD_cards
My speeds are as follows running at 900mhz with a 512k  Rspberry pi using an Optima 8gb Class 10 pro
sync; time dd if=/dev/zero of=~/test.tmp bs=500K count=1024; time sync
524288000 bytes (524 MB) copied, 24.9181 s, 21.0 MB/s

real    0m24.936s
user    0m0.000s
sys    0m7.920s

real    0m4.018s
user    0m0.010s
sys    0m0.120s
dd if=~/test.tmp of=/dev/null bs=500K count=1024
1024+0 records in
1024+0 records out
524288000 bytes (524 MB) copied, 24.2981 s, 21.6 M
rm ~/test.tmp
uname -a
Linux raspberrypi 3.6.11+ #474 PREEMPT Thu Jun 13 17:14:42 BST 2013 armv6l GNU/Linux
This is the one i'm using http://reviews.sainsburys.co.uk/2678-en_gb/123007860/reviews.htm?sort=rating

[#2]

Also a stress test should you require one.
http://elinux.org/index.php?title=RPiconfig&section=14%7CSD

 #!/bin/bash #Simple stress test for system. If it survives this, it's probably stable. #Free software, GPL2+ echo "Testing overclock stability..." #Max out the CPU in the background (one core). Heats it up, loads the power-supply. nice yes >/dev/null & #Read the entire SD card 10x. Tests RAM and I/O for i in `seq 1 10`; do echo reading: $i; sudo dd if=/dev/mmcblk0 of=/dev/null bs=4M; done #Writes 512 MB test file, 10x. for i in `seq 1 10`; do echo writing: $i; dd if=/dev/zero of=deleteme.dat bs=1M count=512; sync; done #Clean up killall yes rm deleteme.dat #Print summary. Anything nasty will appear in dmesg. echo -n "CPU freq: " ; cat /sys/devices/system/cpu/cpu0/cpufreq/scaling_cur_freq echo -n "CPU temp: " ; cat /sys/class/thermal/thermal_zone0/temp dmesg | tail echo "Not crashed yet, probably stable."