The caveat is that, on the consumer side, the only combination that supports PCIe 4.0 right now is an X570 motherboard paired with a third-generation Ryzen processor, both of which you will be able to get your hands on in July. In the meantime, we are seeing several companies trot out NVMe Gen4 SSDs with blazing fast transfer speeds.
One thing these next-gen SSDs have in common is the controller, made by Phison. All of the new drives that push 5GB/s read speeds are using the Phison PS5016-E16 controller, paired with 3D TLC (triple-level cell) NAND flash memory chips (Toshiba BiCS 96-layer chips, in this case).
"The advanced fabrication process ensures PS5016-E16 has enough compute power for ECC processing when adopting the latest 3D TLC NAND flash. PS5016-E16 also features eight NAND channels with 32 CE targets, DDR4 DRAM caching, and a PCIe 4.0x4 interface. As for features, the chip supports the NVMe 1.3 protocol, LDPC error correction, and Wear Leveling, Over-Provision technologies to improve reliability and durability of SSDs," Gigabyte explains.
Gigabyte is offering the new AORUS SSDs in capacities up to 2 terabytes. These drives sport a thick, full body copper heatsink to keep temps in check. While we have not tested this (or any of the PCIe 4.0 SSDs) yet, but we strongly suspect that temp control will play in a big factor in being able to both hit the rated speed claims, and maintain that level of performance for any length of time.
As for price and availability, Gigabyte made no mention of other. However, we anticipate the new AORUS line will launch in July, and will cost a premium.