Physical PCIe slots may contain from one to 32 lanes of data. Currently, PCIe Generation 1 offers 250MB/sec. throughput per lane. The second generation of PCIe is expected out next year and will offer twice the throughput, or 500MB/sec. per lane. While SATA 3.0, expected out this year, also doubles throughput, it only offers one lane.

"Each lane of that x4 PCIe is as fast as a SATA 3.0's 6Gbit/sec bus," Klein said. "So I can be four times as fast on that one slot as an SSD could be on a SATA 3.0 connection. That's really the direction things are going."