Important update to post:
Text below is first look on Synology DS213+. Those first result is actually incorrect. Low Read/Write speed in tables below (70/50 MB/s max. with idle CPU and DISK) instead of 110/80 MB/s caused by low quality wired gigabit LAN. In case of perfect gigabit LAN speed much better. Will not remove the post just to note this test issue.
| RAID1 |  |
 |
|---|---|---|
| Read MB/s | 48.1 | 54.7 | CPU Load read | 100% | 50% |
| Write MB/s | 18.2 | 51.2 |
| CPU Load write | 100% | 80% |
| CPU | Freescale PowerQUICC MPC8533EPB (1x800MHz) | Freescale QorlQ P1022 (2x1067MHz) |
| MEM | 64-bit DDR3 512MB | 64-bit DDR3 512MB |
| ports | eSATA, USB2.0 | eSATA, USB3.0*, SD |
| other | small | big fan, hotplug |
Some thing that makes upgrade not perfect is external USB 3.0 disk disconnects somewhere in the middle of file copy. eSATA work perfect.