Is there ANY actual performance difference between the two types of CF cards below when using with Nikon D3s/D3x bodies (at max. resolution and with all functions, including continuous shooting, video, etc.)? 64GB CompactFlash Memory Card Extreme Pro 600x UDMA http://www.bhphotovideo.com/c/product/646880-REG/SanDisk_SDCFXP_064G_A91_64GB_Extreme_Pro_CompactFlash.html 64GB CompactFlash Memory Card Extreme 400x UDMA http://www.bhphotovideo.com/c/product/843240-REG/SanDisk_SDCFX_064G_A61_64GB_CompactFlash_Memory_Card.html An other questions: is the Extreme Pro more reliable, durable, better made than the Extreme? Or the difference is just in the data transfer rate? Thank you!