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XFX Speedster MERC 308 RX 6600 XT

  • RX-66XT8TBDQ
Graphics Processor
Navi 23
Cores
2048
TMUs
128
ROPs
64
Memory Size
8 GB
Memory Type
GDDR6
Bus Width
128 bit
GPU Chip
GPU
Top
Top
Rear
Rear

Graphics Processor

GPU Name
Navi 23
GPU Variant
Navi 23 XT
(215-130000006)
Architecture
RDNA 2.0
Foundry
TSMC
Process Size
7 nm
Transistors
11,060 million
Die Size
237 mm²

Graphics Card

Release Date
Jul 30th, 2021
Availability
Aug 10th, 2021
Generation
Navi II
(RX 6000)
Predecessor
Navi
Production
Active
Bus Interface
PCIe 4.0 x8

Clock Speeds

Base Clock
1968 MHz
2188 MHz (+11%)
Game Clock
2359 MHz
2428 MHz (+3%)
Boost Clock
2589 MHz
2607 MHz (+1%)
Memory Clock
2000 MHz
16 Gbps effective

Memory

Memory Size
8 GB
Memory Type
GDDR6
Memory Bus
128 bit
Bandwidth
256.0 GB/s

Render Config

Shading Units
2048
TMUs
128
ROPs
64
Compute Units
32
RT Cores
32
L0 Cache
32 KB per WGP
L1 Cache
128 KB per Array
L2 Cache
2 MB
L3 Cache
32 MB

Theoretical Performance

Pixel Rate
165.7 GPixel/s
166.8 GPixel/s
Texture Rate
331.4 GTexel/s
333.7 GTexel/s
FP16 (half) performance
21.21 TFLOPS
21.36 TFLOPS (2:1)
FP32 (float) performance
10.60 TFLOPS
10.68 TFLOPS
FP64 (double) performance
662.8 GFLOPS
667.4 GFLOPS (1:16)

Board Design

Slot Width
Dual-slot
Triple-slot
Length
190 mm
274 mm
7.5 inches
10.8 inches
Width
110 mm
114 mm
4.3 inches
4.5 inches
Height
40 mm
50 mm
1.6 inches
2 inches
TDP
160 W
Suggested PSU
450 W
Outputs
1x HDMI
2x DisplayPort
Power Connectors
1x 8-pin
Idle Fan Stop
Yes

Graphics Features

DirectX
12.0 Ultimate (12_2)
OpenGL
4.6
OpenCL
2.1
Vulkan
1.2
Shader Model
6.5

Navi 23 GPU Notes

Architecture Codename: Navi
Codename: Dimgrey Cavefish
Graphics/Compute: GFX10 (gfx1032)
Display Core Next: 3.0
Video Core Next: 3.0

Other retail boards based on this design (24)

Name GPU Clock Boost Clock Memory Clock Other Changes
ASRock RX 6600 XT Challenger D OC 2000 MHz 2593 MHz 2000 MHz 269 mm/10.6 inches
ASRock RX 6600 XT Challenger ITX 1968 MHz 2589 MHz 2000 MHz 179 mm/7 inches
ASRock RX 6600 XT Challenger Pro OC 2033 MHz 2602 MHz 2000 MHz 303 mm/11.9 inches
ASRock RX 6600 XT Phantom Gaming D OC 2064 MHz 2607 MHz 2000 MHz 305 mm/12 inches, Triple-slot
ASUS DUAL RX 6600 XT OC 2000 MHz 2593 MHz 2000 MHz 243 mm/9.6 inches
ASUS ROG STRIX RX 6600 XT GAMING OC 2064 MHz 2607 MHz 2000 MHz 243 mm/9.6 inches, Triple-slot
BIOSTAR RX 6600 XT 1968 MHz 2589 MHz 2000 MHz
Dataland RX 6600 XT X-Serial 2064 MHz 2607 MHz 2000 MHz 224 mm/8.8 inches
GIGABYTE RX 6600 XT EAGLE 1968 MHz 2589 MHz 2000 MHz 282 mm/11.1 inches, 2x HDMI 2x DisplayPort
GIGABYTE RX 6600 XT GAMING OC 1968 MHz 2589 MHz 2000 MHz 282 mm/11.1 inches, 2x HDMI 2x DisplayPort
GIGABYTE RX 6600 XT GAMING OC PRO 1968 MHz 2589 MHz 2000 MHz 282 mm/11.1 inches, 2x HDMI 2x DisplayPort
MSI RX 6600 XT GAMING 1968 MHz 2589 MHz 2000 MHz 277 mm/10.9 inches, Triple-slot
MSI RX 6600 XT GAMING X 2064 MHz 2607 MHz 2000 MHz 277 mm/10.9 inches, Triple-slot
MSI RX 6600 XT MECH 1968 MHz 2589 MHz 2000 MHz 235 mm/9.3 inches
MSI RX 6600 XT MECH OC 2033 MHz 2602 MHz 2000 MHz 235 mm/9.3 inches
PowerColor Fighter RX 6600 XT 1968 MHz 2589 MHz 2000 MHz 200 mm/7.9 inches
PowerColor Hellhound RX 6600 XT 2000 MHz 2593 MHz 2000 MHz 220 mm/8.7 inches
PowerColor Red Devil RX 6600 XT 2064 MHz 2607 MHz 2000 MHz 251 mm/9.9 inches, Triple-slot
Sapphire NITRO+ RX 6600 XT 2064 MHz 2607 MHz 2000 MHz 240 mm/9.4 inches, Triple-slot
Sapphire PULSE RX 6600 XT 2000 MHz 2593 MHz 2000 MHz 240 mm/9.4 inches, Triple-slot
XFX Speedster MERC 308 RX 6600 XT 2188 MHz 2607 MHz 2000 MHz 274 mm/10.8 inches, Triple-slot
XFX Speedster QICK 308 RX 6600 XT 2188 MHz 2607 MHz 2000 MHz 274 mm/10.8 inches
XFX Speedster SWFT 210 RX 6600 XT 2092 MHz 2589 MHz 2000 MHz 241 mm/9.5 inches
Yeston RX 6600 XT GAEA 1968 MHz 2589 MHz 2000 MHz