Apu2 vs apu4

apu2 vs apu4

• 4GB DRAM

• additional internal USB header

• power/reset/watchdog header changed

• LPC header removed
• RXD3/TXD3 wired to PCIe x1 expansion
• SIM switch added
• use of mPCI slots explicitly specified
• fan control removed
• SIMSWAP pin added
• APU straps changed
• I'm not sure about mSATA changes, but it looks something is different
• internal USB2.0 header added
• some PCIe connections removed (page 5)