Sheeva CPU Core 1.2 GHz; L1 Cache: 16K Instruction + 16K Data; L2 Cache: 
256KB
512MB 16bit DDR2 @ 800MHz data rate
NAND FLASH Controller, 8-bit bus
512MB NAND FLASH: 4Gb x8, direct boot
128-bit eFuse Memory
1x eSATA 2.0 port -3Gbps SATAII
2x USB 2.0
1x Internal MicroSD Socket for Optional Kernel System
1x External MicroSD Socket

http://www.globalscaletechnologies.com/t-guruplugdetails.aspx#features