1GB/s is a bit much for an SSD, since SATA currently only goes up to 6Gbit/s. PCIe-based SSDs can do it, but for a good SATA SSD, you can expect speeds ranging from 100MB/s to 500MB/s depending on the workload.

Most of the speed advantage SSDs have comes from having a dozen or more flash chips that are internally treated as something like a RAID array. Memory cards and USB sticks usually have only one or two chips.