AMD Radeon RX 6600 XT PCI-Express Scaling

on Aug 23rd, 2021,

Manufacturer: AMD

Test System

Test System - VGA 2021.1
Processor:	AMD Ryzen 7 5800X @ 4.8 GHz (Zen 3, 32 MB Cache)
Motherboard:	MSI B550-A Pro BIOS 7C56vA5 / AGESA 1.2.0.0
Resizable BAR:	Enabled on all AMD RDNA 2 & NVIDIA Ampere cards
Memory:	Thermaltake TOUGHRAM, 16 GB DDR4 @ 4000 MHz 19-23-23-42 1T Infinity Fabric @ 2000 MHz (1:1)
Cooling:	Cooler Master MasterLiquid ML240L V2 240 mm AIO
Storage:	2x Neo Forza NFP065 2 TB M.2 NVMe SSD
Power Supply:	Seasonic Prime Ultra Titanium 850 W
Case:	darkFlash DLZ31 Mesh
Operating System:	Windows 10 Professional 64-bit Version 20H2 (October 2020 Update)
Drivers:	RX 6600 XT: 21.8.1 Beta RTX 3070 Ti: 466.61 Beta RTX 3080 Ti: 466.54 Beta RTX 3060, 3060 Ti, 3070, 3080, 3090: 466.27 WHQL RX 6700 XT, 6800, 6800 XT, 6900 XT: 21.4.1 WHQL All other AMD: 21.2.3 Beta All other NVIDIA: 461.72 WHQL

Benchmark scores in other reviews are only comparable when this exact same configuration is used.

All games and cards are tested with the drivers listed above—no performance results were recycled between test systems. Only this exact system with exactly the same configuration is used.
All graphics cards are tested using the same game version.
All games are set to their highest quality setting unless indicated otherwise.
AA and AF are applied via in-game settings, not via the driver's control panel.
Before starting measurements, we heat up the card for each test to ensure a steady state is tested. This ensures that the card won't boost to unrealistically high clocks for only a few seconds until it heats up, as that doesn't represent prolonged gameplay.

Each game is tested at these screen resolutions:

1920x1080: Most popular monitor resolution.
2560x1440: Intermediary resolution between Full HD and 4K, with reasonable performance requirements.
3840x2160: 4K Ultra HD resolution, available on the latest high-end monitors.

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