Hardware Spec Index

Kyndral GX-6421 Ultra 8GB GDDR6 Graphics Card

Graphics Cards · Kyndral · SKU GX6421-ULTRA · Released 2025 · Updated 2026-10-25

Key facts

Benchmark index10,646 (Graphics Cards scale)
Category rank#36,154
Street price$139
Power135 W (TGP)
Performance per dollar76.59
Released2025

Specifications

BrandKyndral
ModelKyndral GX-6421 Ultra
Video memory8 GB GDDR6
Memory bus128-bit
Memory speed18 Gbps
Memory bandwidth288 GB/s
Shader units2,560
Boost clock2,732 MHz
Bus interfacePCIe 5.0 x8
Total graphics power (TGP)135 W
Power connectors1× 8-pin PCIe
Recommended PSU550 W
Ray tracingHardware-accelerated
UpscalingFSR 4, FSR 3.1
Display outputs1× HDMI 2.1b, 3× DisplayPort 2.1b
Resizable BARSupported
Card size2-slot, 204 mm

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Cite this page: Hardware Spec Index, “Kyndral GX-6421 Ultra 8GB GDDR6 Graphics Card”, https://vextor7.com/item/3023264 (accessed 2026-10-25).