RAID 1 (mirroring) will give you resilience and can offer slight improvements for read speeds. What you may have meant was RAID 0 (striping) which writes in stripes across multiple disks. The downside is it is more likely to suffer a failure than using a single disk - lose one disk and you lose everything. If data integrity is not important then this can speed things up.
For RAID 0, 1 and indeed 5, all drives need to be the same size.
If you have an SSD drive that is a well performing one, the bottleneck you are possibly seeing is SATA itself. What version of SATA does your motherboard support? If it only take 2Gb RAM then it might be time to upgrade the motherboard.
My data is stored on a NAS these days - a Netgear ReadyNAS Duo. It has mirrored 2Tb disks, i.e. 2 x 2Tb. It's already half full.
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RAID setups new
RAID setups new