GH4 GH4 using Lexar 128GB 133x
- Thread starter blando3
- Start date
Bruce Foreman
Veteran
I flat won't take chances. QC on Lexar, Transcend, and the lower priced bargain brands may have improved but I won't risk it.
So I use nothing but SanDisk purchased from B&H. Never lost a file or had one corrupted.
So I use nothing but SanDisk purchased from B&H. Never lost a file or had one corrupted.
Probably 24p MOV. These were pretty high end cards a few years ago, purchased from B&H.
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mdifilm
Well-known member
As long as the card can write over 45Mb/s then you should be fine. Remember the specs for the GH4 is 200mbps write speed for 1080 and 100mbps for 4k, and 100mbps is actually 25Mb/s. It gets confusing at times since Mb/s and mbps are different... I've been using 2 Transend UH1 Class 10 that writes 600x without any issue for a few months now, even had done a 2.5 hrs straight shoot (the battery died on me first)
joe1946
Veteran
Is 133x a typo ? B&H shows a Lexar 128GB 600x SDXC card.
http://www.bhphotovideo.com/c/produ...128crbna600_128gb_sdxc_uhs_1_memory_card.html
BTW the fastest are the 1866x Sandisk UHS-II cards.
http://www.bhphotovideo.com/c/searc...0MB/s+(1866x)&ci=1097&N=4037060554+3953047286
The Lexar 133x cards were sold a few years back, but are no longer available new (Lexar currently sells 600x cards). Some info on these older cards can be found here: http://www.lexar.com/products/lexar-professional-133x-sdhc-card
Officially the 133x designation refers to the read speed, where 1x is 150 KB/s, which means that 133x works out to about 20 MB/s. As indicated on Lexar's website, sustained write speeds tend to be lower than the read speeds. It is a Class 10 card which should guarantee at least 10 MB/s write speed, so probably the sustained write speed is somewhere between 10-20 MB/s. A little more about the speed ratings can be found here:
http://www.lexar.com/files/product/datasheet/White_Paper_SD_Class_xRating_updatedUHS_Final_0.pdf
The 133x cards are probably faster enough for some of the lower bitrate recording options, but are almost certainly not fast enough for the highest 200 Mbps recording rate.
Mb is short for megabit, and MB is short for megabyte. Since there are 8 bits in a byte, a megabit is 1/8th of a megabyte. So 200 Mbps (sometimes written 200 Mb/s) is 25 MB/s and 100 Mbps would work out to 12.5 MB/s.
It's possible the 133x cards would be fast enough for the 100 Mbps mode (assuming the write speeds are greater than 12.5 MB/s) but I probably wouldn't chance it. Keep in mind that since most video is variable bitrate, at times the data may need to be written slightly faster or slower than the target bitrate. So you usually want at least a little margin.
The Lexar 600x cards have a 45 MB/s write speed, so in principle they should be fast enough, although their write speeds are not as fast as the SanDisk Extreme Pro cards which hit about 70 MB/s (course they don't cost as much as the SanDisk cards either). The original SanDisk Extreme Pro cards are mentioned in this review (the Extreme Pro UHS-II cards are even faster):
http://www.storagereview.com/lexar_professional_600x_sdxc_uhsi_review
Officially the 133x designation refers to the read speed, where 1x is 150 KB/s, which means that 133x works out to about 20 MB/s. As indicated on Lexar's website, sustained write speeds tend to be lower than the read speeds. It is a Class 10 card which should guarantee at least 10 MB/s write speed, so probably the sustained write speed is somewhere between 10-20 MB/s. A little more about the speed ratings can be found here:
http://www.lexar.com/files/product/datasheet/White_Paper_SD_Class_xRating_updatedUHS_Final_0.pdf
The 133x cards are probably faster enough for some of the lower bitrate recording options, but are almost certainly not fast enough for the highest 200 Mbps recording rate.
Mb is short for megabit, and MB is short for megabyte. Since there are 8 bits in a byte, a megabit is 1/8th of a megabyte. So 200 Mbps (sometimes written 200 Mb/s) is 25 MB/s and 100 Mbps would work out to 12.5 MB/s.
It's possible the 133x cards would be fast enough for the 100 Mbps mode (assuming the write speeds are greater than 12.5 MB/s) but I probably wouldn't chance it. Keep in mind that since most video is variable bitrate, at times the data may need to be written slightly faster or slower than the target bitrate. So you usually want at least a little margin.
The Lexar 600x cards have a 45 MB/s write speed, so in principle they should be fast enough, although their write speeds are not as fast as the SanDisk Extreme Pro cards which hit about 70 MB/s (course they don't cost as much as the SanDisk cards either). The original SanDisk Extreme Pro cards are mentioned in this review (the Extreme Pro UHS-II cards are even faster):
http://www.storagereview.com/lexar_professional_600x_sdxc_uhsi_review
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