SanDisk Extreme PRO Cfexpress Card Type B, 512GB, Up To 1700MB/S, for RAW 4K Video
About this deal
On 21 October 2021, Sony announced the α7 IV, a mirrorless camera that will support single CFexpress Type A and SD cards. 
Why it made the cut: It offers fast read and write speeds at lower prices than the Sony alternative.Overall, the Lexar Gold Series Professional CFexpress Type A Card is a top-performing and reliable memory card option for professional creators who demand the best from their gear. Its fast read and write speeds, sustained performance, and durability make it a valuable addition to any photographer or videographer’s toolkit. Yes. Some controllers do get hot, and would be fine in a computer because there's more airflow, but in a camera, not so much. However, where the Cobalt cards really shine is that ProGrade doesn't just advertise their peak read/write speeds, it actually guarantees the minimum sustained write speed (host device permitting). In this case, that's 1400MB/s - just 100MB/s shy of the 1500MB/s max write rate, which is hugely impressive. Two capacities are offered - 325GB and 650GB - and both are 'reassuringly' expensive for their size, but when has top performance ever been cheap?
The CFexpress Type B USB 3.2 Gen 2×2 Reader is equipped with a USB Type-C interface and comes with an included 2-in-1 USB Type-C to USB Type-C cable and USB Type-C to USB Type-A cable, providing versatile connectivity options. This makes it easy to connect the card reader to a wide range of devices, from laptops to mobile devices. I own one of the 128GB Manfrotto CFe-B cards, which works well on my Nikon D850. It's not quite as fast as my Sony Tough CFe-B card.There are three CFexpress variants: Type A, Type B and Type C. The two newer ones, A and C, were introduced when the CompactFlash Association revised the standard to ‘2.0’ in 2019. On November 10, 2020, Microsoft launched the Xbox Series X and Series S with a slot for semi-proprietary Expansion Cards based on a CFexpress Type B form factor.  These Cards only support PCIe Gen4. 
AFAIK SSDs in most laptops pretty much just bake in their own heat, they're not actively cooled, even desktop ones aren't really aided by those heat spreaders many come with; most of them will simply throttle when/if they get too hot during sustained operations. It's usually the controller that gets the hottest rather than the NAND so it's also very localized.CFexpress 2.0 type B Gen4 Cards are basically already available in the form of the Seagate Storage Expansion Card for Xbox Series X|S, which are mechanically incompatible to most slots because of their lengthened housing.