Unfortunately, that SanDisk Extreme Pro 128GB UHS-I 200MB/s is gonna be a total letdown for your R7. It uses proprietary tech to reach those speeds which the Canon body doesnt support, so itll basically revert to slow UHS-I speeds. I've had issues with buffer hang using that exact card during fast bursts. Its just not as good as expected for a high-res sensor like yours... If you want to stay under $45, look at the ProGrade Digital SDXC UHS-II V60 Gold 128GB. Its much more consistent with its write cycles and wont choke as easily. Another option is the Sony SF-E Series UHS-II V60 128GB. Both are true UHS-II and way more reliable than the budget Lexar lines which have questionable QC. TL;DR: Avoid UHS-I cards for the R7. Grab the ProGrade V60 for stable burst performance within your budget.

> I just dont want my buffer to hang... Just saw this and had to chime in! For that R7 speed, you definitely want a V60 card. Check out the ProGrade Digital SDXC UHS-II V60 Gold 64GB. It is fantastic for the price and usually under $40! It handles those fast track bursts like a champ. ProGrade is super reliable too, so you wont have to worry about failures mid-race. Good luck at the track meet!

In my experience with the R7, you really need UHS-II cards to avoid buffer lag during track meets. I've tried many over the years and found that UHS-I cards just wont cut it for fast bursts.

• Lexar Professional 1667x SDXC UHS-II V60 fits your budget and offers consistent write speeds.
• Kingston Canvas React Plus SDXC UHS-II V90 is superior but often exceeds 45 dollars. I'd go with the Lexar. Its reliable and fast enough for those sprints.