Identify part for Acer Predator P5NCN

I need help to identify the part to buy for Acer Predator motherboard P5NCN. From board viewer it is U8300 DDR module VX_QFN_20P_16_S118_P_H31_4V. 25 or 20 pins IC
pin 1 = GND
pin 2 = DDR_VTTSNS
pin 3 = GND
pin 4 = +V_SM_VREF_R
pin 5 = DDR_VDDQ
pin 6 = DDR_FB
pin 7 = S3
pin 8 = S5
pin 9 =N21533547
pin 10= DDR_PWRGD
pin 11= DDR_VID
pin 12 = DDR_VDD
pin 13 = DDR_CS
pin 14 = GND
pin 15= DDR_LG
pin 16=DDR=LX
pin 17=DDR_HG
pin18=DDR_BST
pin19=BLDOIN
pin20= +0.6VO
pin 21= GND
pin 22 = GND
pin 23 = GND
pin 24 = GND
pin 25 = GND