64GB G series UHS-II SDXC wont write to specified speeds?

[funomoly]

Hi everyone - first post!

Sorry if its in the wrong section, I couldnt find a memory card area.

Q - I have a SF-G64 SDXC card which wont write anywhere close to the 299mb/s advertised speed?

I ran a Black Magic speed test (using a Sandisk UHS-II adapter) and the maximum write speed I could get after a 5GB stress test is 185.9mb/s.

Is this normal as I paid a pretty penny for two of these G series cards and have heard the M series perform pretty much the same and for half the price!

I posted a screengrab below!

Thanks in advance!

SF-G64

[funomoly]

Hi Sorry forgot to answer that - Yeh I bought the cards after a long search on what would work on my GH5.

I already have a 64GB 95mb/s Extreme Pro sdxc card and that stopped recording video after 13minutes at 4k 8bit.

Next up was the 64GB Transcend sdxc card - same thing but cut out after 5minutes again at 4k 8bit.

Now, I'm on the Sony G 64GB which is the only card to not cut out on me in 4k 8bit (2hr40mins record time) but now I can record 4k 10bit (1hr40mins).