it says here that it is 8 core but Intel says the Intel Core i7-9750H is 6 core ??

This model processor have 6 cores.

Your description says 144hz & your answer to a question says the gu /gv have 120hz and gt has 60. asus website say gt can be 120hz. please explain?

The descriptions indicates the model can have 144Hz which would be the highest. However with different model(GT, GU, GV) there are different specifications and variations. The model which supports the 144Hz would be " GL731GU-RB74". The model in question which is " GL731GT-PH74" supports a maximum of 120Hz.

Can you add a hard disk to this computer?

Yes you can, you need an adapter for it to work properly. They can be ordered from most online retailers.

Does this suppodoes this support multi monitor (three or more) if yes how?rt multi monitor (three or more) if yes how?

Yes, but only one external monitor is supported. In order to add more than one external monitor you will need a hub of some sort. This laptop has only 1 (one) HDMI port.

Brand	ASUS
Product Dimensions	39.98 x 29.34 x 2.64 cm; 2.85 Kilograms
Batteries	1 Lithium Polymer batteries required. (included)
Item model number	GL731GT-PH74
Manufacturer	Asus
Color	Black
Form Factor	Laptop
Standing screen display size	17.3 Inches
Screen Resolution	1920 x 1080 pixels
Resolution	1920 x 1080
Processor Brand	NVIDIA
Processor Type	Core i7
Processor Count	8
RAM Size	16 GB
Memory Technology	DDR4
Computer Memory Type	DDR4 SDRAM
Memory Clock Speed	2666 MHz
Hard Drive Size	512 GB
Hard Disk Description	Solid State Hard Drive
Hard Drive Interface	Gigabit Ethernet
Audio Details	Headphones
Graphics Coprocessor	NVIDIA GeForce GTX 1650
Graphics Chipset Brand	NVIDIA
Graphics Card Description	Dedicated
Graphics Card Ram Size	4 GB
Graphics Card Interface	PCI Express
Connectivity Type	Wi-Fi
Wireless Type	Bluetooth, 802.11a/g/n/ac
Voltage	12 Volts
Wattage	50 watts
Operating System	Windows 10 Home
Battery Charge Cycles	7 Hours
Average Battery Life (in hours)	6 Hours
Are Batteries Included	Yes
Lithium Battery Energy Content	48 Watt Hours
Lithium Battery Packaging	Batteries contained in equipment
Lithium Battery Weight	0.4 Grams
Number Of Lithium Ion Cells	3
Item Weight	2.85 Kilograms

ASUS Rog Strix G Gaming Laptop 17.3 Ips Type Fhd Nvidia Geforce Gtx 1650 Intel Core I7 9750H 16Gb Ddr4 512Gb Pcie Nvme Ssd Rgb Kb Windows 10 Home Gl731Gt Ph74 17-30.99 inches

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