Will this work if you have 8 PCI slots instead of 7 ?

Yes, the Cooler Master Master Accessory Vertical Graphics Card Holder Kit will work if you have 8 PCI slots instead of 7, as it is compatible with all standard ATX chassis with at least 7 available PCI slots.

will this fit in a Cooler Master MasterBox MB520 ARGB ATX Mid-Tower with ARGB Lighting System?

Yes, the Cooler Master Master Accessory Vertical Graphics Card Holder Kit is compatible with all standard ATX chassis, including the Cooler Master MasterBox MB520 ARGB ATX Mid-Tower, as long as it has at least 7 available PCI slots.

Questions & Answers: Cooler Master MasterAccessory Vertical Graphics Card Holder Kit

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Cooler Master MasterAccessory Vertical Graphics Card Holder Kit Ver 2 with Premium Riser Cable PCI-E 3.0 x16 - 165mm, Compatible with all Standard ATX Chassis

Showcase Your Graphics Card: The vertical graphics card holder Kit allows vertical installation of a GPU to better show off the visual design of the GPU and its cooler.
Compatible with all Standard ATX Chassis: The newly revised vertical graphics card holder kit fits all standard ATX chassis with at least 7 available PCI slots.
Modular, Instantly Adjustable Design: The position of the GPU can move back and forth to allow cables to pass through chassis with either closed or open PCI slots.
Durable, High Quality Materials: Thick SGCC steel prevents the largest and heaviest GPUs from bending the GPU holder.
Cooler Master Riser Cable Version 2 included: A high quality Cooler Master version 2 riser cable completes the vertical GPU holder package.

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