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Triple-fan graphics card in dark finish with angular shroud and backplate

XFX

XFX RX-66XT8TBDQ SPEEDSTER MERC308 Radeon RX 6600 XT graphics card

SKU CH-0X99-J3D10 MPN RX-66XT8TBDQ

Refurbished AMD Radeon graphics card with 8 GB GDDR6 memory, 2048 stream processors, boost clock of 2607 MHz, triple-fan cooler, HDMI 2.1 and three DisplayPort 1.4 outputs

  • InterfacePCI Express 4.0
  • Chipset ManufacturerAMD
  • GPU SeriesAMD Radeon RX 6000 Series
  • GPURadeon RX 6600 XT
  • Core Clock2188 MHz
  • Boost Clock2607 MHz
  • 8GB GDDR6 memory delivers smooth 1080p and 1440p gaming
  • Boost clock reaches 2607 MHz for higher frame rates in demanding titles
  • PCI Express 4.0 interface provides full bandwidth on modern motherboards
  • Triple-fan cooler keeps thermals in check during extended sessions
  • HDMI 2.1 and three DisplayPort 1.4 outputs support multi-monitor and high-refresh setups

SPEEDSTER MERC308 Radeon RX 6600 XT

The XFX SPEEDSTER MERC308 Radeon RX 6600 XT is a refurbished graphics card built on AMD RDNA 2 architecture. It delivers 2048 stream processors and 8GB of GDDR6 memory across a 128-bit interface. The card targets 1080p gaming with high refresh rates and supports DirectX 12 Ultimate. A triple-fan cooler manages thermals within a 2.5-slot form factor.

PCI Express 4.0 8GB GDDR6 upgrade

Moving from an older 4GB or 6GB card to this 8GB model removes a common texture bottleneck in modern titles. The PCI Express 4.0 interface doubles bandwidth over 3.0 when paired with a compatible platform. The jump is worth it when your current GPU hits its memory limit before its compute limit. A 750W power supply and one 8-pin connector are required.

2607 MHz boost under sustained load

The boost clock reaches 2607 MHz while the triple-fan array maintains airflow across the 274 mm board length. Clock stability holds better than blower-style coolers during extended sessions. Power draw stays within the 8-pin connector rating without throttling. Frame pacing remains consistent in DirectX 12 Ultimate workloads.

Highlights

  • 8GB GDDR6 memory delivers smooth 1080p and 1440p gaming
  • Boost clock reaches 2607 MHz for higher frame rates in demanding titles
  • PCI Express 4.0 interface provides full bandwidth on modern motherboards
  • Triple-fan cooler keeps thermals in check during extended sessions
  • HDMI 2.1 and three DisplayPort 1.4 outputs support multi-monitor and high-refresh setups

Specifications

BrandXFX
SeriesSPEEDSTER MERC308
ModelRX-66XT8TBDQ
InterfacePCI Express 4.0
Chipset ManufacturerAMD
GPU SeriesAMD Radeon RX 6000 Series
GPURadeon RX 6600 XT
Core Clock2188 MHz
Boost Clock2607 MHz
Stream Processors2048
Effective Memory Clock16 Gbps
Memory Size8GB
Memory Interface128-Bit
Memory TypeGDDR6
DirectXDirectX 12 Ultimate
HDMI1 x HDMI 2.1
DisplayPort3 x DisplayPort 1.4
Virtual Reality ReadyYes
CoolerTriple Fans
Recommended PSU Wattage750W
Power Connector1 x 8-Pin
FeaturesAMD RDNA 2 Architecture
DirectX 12 Ultimate
GDDR6 Memory
PCI Express 4.0 Support
AMD FreeSync Technology
DisplayPort 1.4 with DSC
HDMI 2.1 VRR
Video Streaming up to 8K
Radeon VR Ready Premium
AMD FidelityFX
Radeon Image Sharpening
Radeon Anti-Lag
Radeon Software
Game Driver Optimizations
Max GPU Length274 mm
Card Dimensions (L x H)10.79" x 4.49"
Slot Width2.5 Slot
Shipping weight1.34 kg
Package size362 × 198 × 120 mm

Questions about this item

What case clearance does the 274 mm long card with a 2.5 slot width need?

The board measures 274 mm in length and occupies 2.5 slots, so the chassis must provide at least that much length and vertical space.

Which power connector must be attached during installation, and what PSU rating is recommended?

Connect the single 8-pin power plug and use a power supply rated for at least 750 W.

How should the triple-fan cooler be maintained over time?

Periodically remove dust from the three fans and heatsink fins with compressed air to keep airflow unrestricted.

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