Can I use this VGA card if my motherboard only supports PCIe3 or lower?

Yes, the ASRock Challenger Radeon RX 6400 Graphics Card has an interface of PCI Express 4.0, which is backward compatible with PCI Express 3.0 and lower, so you can use it with a motherboard that supports PCIe3 or lower.

Does the VGA ASROCK|RX6400 CLI 4G R require external power connectors?

No it doesn't, it just needs to be attached to the motherboard properly

GIGABYTE 27" QHD 2K 1440P 180hz IPS with AMD FreeSync Premium 1ms HDR ready Gaming Computer Monitor GS27QA

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ASRock Challenger Radeon RX 6400 4GB GDDR6 PCI Express 4.0 ITX Graphics Card RX6400 CLI 4G

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4GB 64-Bit GDDR6
Core Clock 1923 MHz
Boost Clock 2321 MHz
1 x HDMI 2.1 1 x DisplayPort 1.4
768 Stream Processors
PCI Express 4.0

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Overview

Specs

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Model
Brand	ASRock
Series	Challenger
Model	RX6400 CLI 4G

Interface
Interface	PCI Express 4.0

Chipset
Chipset Manufacturer	AMD
GPU Series	AMD Radeon RX 6000 Series
GPU	Radeon RX 6400
Architecture	RDNA 2
Core Clock	1923 MHz
Game Clock	2039 MHz
Boost Clock	2321 MHz
Stream Processors	768 Stream Processors

Memory
Effective Memory Clock	16 Gbps
Memory Size	4GB
Memory Interface	64-Bit
Memory Type	GDDR6

3D API
DirectX	DirectX 12 Ultimate
OpenGL	OpenGL 4.6

Ports
Multi-Monitor Support	2
HDMI	1 x HDMI 2.1
DisplayPort	1 x DisplayPort 1.4

Details
Max Resolution	7680 x 4320
Cooler	Single Fan
Thermal Design Power	53W
Recommended PSU Wattage	350W
HDCP Ready	Yes

Features
Features	Single Fan Design 0dB Silent Cooling Fit small form factor system Super Alloy Graphics Card ASRock Tweak 2.0 AMD FidelityFX Super Resolution Hardware Raytracing

Form Factor & Dimensions
Form Factor	ITX
Max GPU Length	162 mm
Card Dimensions (L x H)	6.38" x 4.41"
Slot Width	2 Slots

Packaging
Package Contents	Accessories: 1 x Quick Installation Guide

Additional Information
First Listed on Newegg	February 18, 2026

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ASRock Challenger Radeon RX 6400 4GB GDDR6 PCI Express 4.0 ITX Graphics Card RX6400 CLI 4G

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