GPU Comparison
RADEON
AMD Radeon RX 640 OEM
CORE STATE
Polaris 23
VRAM
4 GB
CLOCK SPEED
—
TDP
50 W
BUS WIDTH
128 bit
ARCHITECTURE
GCN 4.0
PROCESS
14 nm
LAUNCH DATE
2020
VS
GEFORCE
GeForce GT 645 OEM
CORE STATE
GF114
VRAM
1024 MB
CLOCK SPEED
—
TDP
102 W
BUS WIDTH
192 bit
ARCHITECTURE
Fermi 2.0
PROCESS
40 nm
LAUNCH DATE
2012
DETAILED SPECIFICATIONS
SPECIFICATION
RX 640 OEM
GT 645 OEM
Core Specs
Shading Units
640
288
-55.0%
Shaders
640
288
-55.0%
TMUs
40
48
+20.0%
ROPs
16
24
+50.0%
Compute Units
10
—
SM Count
—
6
Clocks
GPU Clock
1295 MHz
776 MHz
Shader Clock
—
1552 MHz
Memory Clock
1500 MHz
6 Gbps effective
957 MHz
3.8 Gbps effective
Memory
Memory Size
4 GB
1024 MB
VRAM (MB)
4,096
1,024
-75.0%
Memory Type
GDDR5
GDDR5
Memory Bus
128 bit
192 bit
Bandwidth
96.00 GB/s
91.87 GB/s
Cache
L1 Cache
16 KB (per CU)
64 KB (per SM)
L2 Cache
512 KB
384 KB
Performance
Pixel Rate
20.72 GPixel/s
9.312 GPixel/s
Texture Rate
51.80 GTexel/s
37.25 GTexel/s
FP32 (TFLOPS)
1.658 TFLOPS
894.0 GFLOPS
FP64 (TFLOPS)
103.6 GFLOPS (1:16)
74.50 GFLOPS (1:12)
FP16 (TFLOPS)
1.658 TFLOPS (1:1)
—
Power
TDP
50 W
102 W
TDP (W)
50
102
+104.0%
Suggested PSU
250 W
300 W
Power Connectors
None
—
Architecture
Architecture
GCN 4.0
Fermi 2.0
GPU Name
Polaris 23
GF114
Generation
Polaris
(RX 600)
GeForce 600
Process Size
14 nm
40 nm
Transistors
2,200 million
1,950 million
Die Size
103 mm²
332 mm²
Foundry
GlobalFoundries
TSMC
Density
21.4M / mm²
5.9M / mm²
API Support
DirectX
12 (12_0)
12 (11_0)
OpenGL
4.6
4.6
Vulkan
1.3
—
OpenCL
2.1
1.1
CUDA
—
2.1
Shader Model
6.7
5.1
Physical
Slot Width
Single-slot
Dual-slot
Length
—
210 mm
8.3 inches
Outputs
1x DisplayPort 1.4a2x mini-DisplayPort 1.4a
2x DVI1x mini-HDMI 1.3a
Bus Interface
PCIe 3.0 x8
PCIe 2.0 x16
Other
Production
End-of-life
End-of-life
Predecessor
Polaris
GeForce 500
Successor
Vega
GeForce 700