Will this be able to do dual graphic card option combo with an older nvidia geforce rtx 2080 normal edition?

Yes, this NVIDIA Official GeForce RTX 2080 Founders Edition supports SLI (Scalable Link Interface) with an NVIDIA RTX NVLink Bridge, which allows you to run a dual graphics card setup.

specs say "1 x DisplayPort 1.4"...but I see 3??

3 display port, 1 hdmi, 1 USB-C

Questions & Answers: NVIDIA Official GeForce RTX 2080 Founders Edition 8GB GDDR6 PCI Express 3.0 Graphics Card

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NVIDIA Official GeForce RTX 2080 Founders Edition 8GB GDDR6 PCI Express 3.0 Graphics Card

256-Bit GDDR6
Core Clock 1515 MHz
Boost Clock 1800 MHz
1 x HDMI 2.0b 1 x DisplayPort 1.4a
2944 CUDA Cores
PCI Express 3.0 x16

Out of Stock