Is it a waste to use this card on a pci-e 3.0 slot?

No, I don't know where you people get these ideas. For 15 years any forum and benchmark has told you people about how a x16 slot really doesn't limit anything. The mighty RTX 4090 see less than a 2% bottleneck on a PCIe 3.0 x16 slot, and less than an 8% bottleneck on a PCIe x16 2.0 slot. By the time anyone has to worry about such a thing, the CPU in that older system will be the bottleneck.

This gpu has 3 connections , can i use the splitted cables (2x 6+2) that comes with my rm750x ?

You would need 3x 8 pin connectors. Not just 2x 6+2pin

What's the difference between the rog strix and tuff versions of this card?

Nothing, really. They are essentially the same exact cards with different shrouds, passives and fans. Performance is the same, VRMs are the same even the PCB is the same.

Brand	ASUS
Product Dimensions	31.83 x 14 x 5.77 cm; 1.77 kg
Item model number	ROG-STRIX-RTX3070TI-O8G-GAMING
Manufacturer	ASUS
Series	ROG-STRIX-RTX3070TI-O8G-GAMING
Colour	red
Resolution	7680x4320
Processor Brand	Nvidia
Computer Memory Type	GDDR6X
Memory Clock Speed	4000 MHz
Graphics Coprocessor	NVIDIA GeForce RTX 3070 Ti
Graphics Chipset Brand	NVIDIA
Graphics Card Description	NVIDIA GeForce RTX 3070 Ti
Graphics RAM Type	GDDR6X
Graphics Card Ram Size	8 GB
Graphics Card Interface	PCI-Express x16
Wattage	750 watts
Hardware Platform	PC
Are Batteries Included	No
Item Weight	1.77 kg
Guaranteed software updates until	unknown

ROG Strix NVIDIA GeForce RTX 3070 Ti OC Edition Gaming Graphics Card (PCIe 4.0, 8GB GDDR6X, HDMI 2.1, DisplayPort 1.4a, Axial-tech Fan Design, 2.9-Slot, Super Alloy Power II, GPU Tweak II)

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