"Solid State Drives" essentially are RAM (not NVRAM, real RAM), with a capacitor and a hard drive. You read an write to the RAM. The data is then copied to the hard drive. When you shutdown the computer, the capacitor powers the RAM and hard drive long enough to copy any unwritten data to the hard drive. The hard drive stores your data while the power is off. See, your computer doesn't have to wait until the write completes on the hard drive - as soon as it is done writing to the RAM, the computer can move on to other tasks (this copying to the hard drive is all handled by circuitry built into the solid state drive). Likewise, reading from RAM is very quick. So solid state drives are extermely fast. But it still needs a hard drive to store the data when the computer is powered off.
There are several different types of interfaces which a computer can use to talk to a hard drive. IDE, EIDE, ATA, SATA, SCSI, iSCSI, SAS, FC-AL, etc. These specify the connection (votages on the various wires, etc., what the various signals on the wires mean, etc.), and the protocol (i.e. what kind of handshaking is going to go on to communiate (i.e. computer sends the hard drive saying "I'm going to write some data to you", the hard drive responds with a signal that means "okay", the computer starts sending data, the hard drive sends a signal that means "wait up, my buffer is getting full", etc.). I'm not as familiar with SAS as some of its predicessors, but if you have two more or less identical drives, one uses EIDE and one uses SCSI, one if them might be faster because the protocol itself is faster, etc. So the type of interface you have can have an impact on speed.
Having said that, solid state is going to have a far greater impact on speed than the interface. Having said that, if you are able to go really fast because you have solid state, you are going to want to use the fastest interface around in order to maximize throughput.
One could have a solid state drive that is IDE, EIDE, ATA, SATA, SCSI, SAS, FC-AL, etc. They are two totally unrelated things.