is there a way to know what CPU, GPU, RAM my phone / tablet has?
Googling the keywords Allwiner A10 yielded this answer by way of this linky. To quote, under the features heading:


  Features of the Allwinner A10 include:
  
  
  1.2ghz Cortex A8 ARM Core
  MALI400MP OpenGL ES 2.0 GPU
  DDR3 Controller 800MHz 1GB
  max 2160p Hardware-accelerated Video playback (4x the resolution of    1080p)
  a NAND Flash Controller that is capable of 8-way concurrent DMA (8    NAND ICs)
  4 SDIO interfaces (SD 3.0, UHI class)
  USB 2.0 Host as well as a 2nd USB-OTG Interface (USB-OTG can be    reconfigured as USB 2.0 Host, automatically)
  24-pin RGB/TTL as well as simultaneous HDMI out
  SATA-II 3gb/sec 10/100 Ethernet (MII compatible)
  a 2nd 24-pin RGB/TTL interface that is multiplexed (shared) on the    same pins for a standard IDE (PATA) interface
  GPIO, I2C, PWM, Keyboard Matrix (8x8), built-in Resistive Touchscreen    Controller, and much more.
  


So it seems, MALI400MP is what's needed to google, yielded this linky 
directly on ARM's site. Quoting the first paragraph:


  The world's first OpenGL ES 2.0 conformant multi-core GPU provides 2D
  and 3D acceleration with performance scalable up to 1080p resolutions,
  while maintaining ARM® leadership on power and bandwidth efficiency.