The ASUS one doesn't have its own RAID controller nor PCIe switch onboard. It relies on the motherboard-provided PCIe bifurcation and if using hardware RAID, it'd use AMD's built-in RAID solution (but I'll use software RAID via Linux dm/md). The HighPoint SSD7500 seems to have a proprietary RAID controller built in to it and some management/monitoring features too (it's the "somewhat enterprisey" version)
The HighPoint card doesn't have a hardware RAID controller, just a PCIe switch and an option ROM providing boot support for their software RAID.
PCIe switch chips were affordable in the PCIe 2.0 era when multi-GPU gaming setups were popular, but Broadcom decided to price them out of the consumer market for PCIe 3 and later.
