Adata XPG SX300 and Crucial m4
The Adata XPG SX300 is based on the familiar SandForce SF-2281 controller which you'll also find in Adata's XPG SX900/SX910 2.5-inch SSDs. Like those models, Adata has disabled SandForce's RAISE technology on the SX300, making available the full 128 GB instead of 120 GB. The 128 GB is provided by four 256 Mbit 25nm NAND chips, the manufacturer of which is unknown. There is no cache memory, which is standard for SandForce-based SSDs.
Adata claims transfer rates of up to 550 MB/s for reading, and up to 505 MB/s for writing. The SX300 128GB costs around £100, equal to about £0.78 per GB, and you get three years of warranty.
The popular Crucial m4 is also available in mSATA, and like its 2.5-inch colleagues it also has the Marvell 88SS9174 controller. Crucial promises read speeds up to MB/s and write speeds of up to 260 MB/s. The SSD has four NAND chips, and also 128 MB DRAM cache.
The Crucial m4 256 mSATA costs an average of £163, which is about £0.64 per GB. This is almost the same price the normal m4 has, and you get three years of warranty.