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Finally it will be an open standard that multiple manufacturers can adopt. And because it is already standardized and cheap technology it will be easier and cheaper to implement. Chip makers will not have to add a new and expensive tech to the device, the connection will just siphon off lanes that are already there. The external PCIe will be cheaper and easier because it will be hosted directly by the mobo chipset, or the CPU by tapping into already existing hardware. but we have not seen that happen over the copper version that was released. It can send PCIe, it can send DP, it was supposed to be able to send USB 1/2/3, as well as Ethernet, all over the same wire. You think the specification will somehow make things cheaper? Nope.thunderbolt is a medium that allows for multiple interconnect protocols to be transmitted over the same wire. However, LaCie's Little Big Disk is more effective with its two SSD 320s than Promise's R4 armed with four SSD 520s when it comes to random performance. Achieving better random throughput is important for certain applications that a hard drive-based solution simply cannot address. In theory, sequential performance should speed up by 5-10% (50-100 MB/s), while random I/O improves by an order of magnitude. Next to the R6, its benefits are likely to be limited. What this quad-SSD R4 variant might offer will depend on what you compare it to.

A single 240 GB Intel SSD 520 runs just north of $300, so a four-SSD variant of the current R4 could conceivably weigh in under $2000.

Using the current 4 TB R4 as a baseline, we assume the 1 TB Hitachi 7K1000.D Deskstar hard drives are about $100 each, with the chassis and components totaling about $750. We don't have an estimate for what the R4 with solid-state storage will cost, either, so we were forced to create our own estimate. Promise does not anticipate selling an SSD-based R6, stating the added cost of six SSDs would would push the price of the R6 beyond what the market will bear.