Home GPU Comparison NVIDIA GeForce RTX 4090D vs NVIDIA GeForce GT 645 OEM

NVIDIA GeForce RTX 4090D vs NVIDIA GeForce GT 645 OEM

We compared two Desktop platform GPUs: 24GB VRAM GeForce RTX 4090D and 1024MB VRAM GeForce GT 645 OEM to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.

Main Differences

NVIDIA GeForce RTX 4090D 's Advantages
Released 11 years and 8 months late
Boost Clock2520MHz
More VRAM (24GB vs 1024GB)
Larger VRAM bandwidth (1008GB/s vs 91.87GB/s)
14304 additional rendering cores
NVIDIA GeForce GT 645 OEM 's Advantages
Lower TDP (102W vs 425W)

Score

Benchmark

FP32 (float)
GeForce RTX 4090D +8125%
73.54 TFLOPS
GeForce GT 645 OEM
0.894 TFLOPS
VS

Graphics Card

Dec 2023
Release Date
Apr 2012
GeForce 40
Generation
GeForce 600
Desktop
Type
Desktop
PCIe 4.0 x16
Bus Interface
PCIe 2.0 x16

Clock Speeds

2280 MHz
Base Clock
-
2520 MHz
Boost Clock
-
1313 MHz
Memory Clock
957 MHz

Memory

24GB
Memory Size
1024MB
GDDR6X
Memory Type
GDDR5
384bit
Memory Bus
192bit
1008GB/s
Bandwidth
91.87GB/s

Render Config

-
-
-
114
SM Count
6
14592
Shading Units
288
456
TMUs
48
176
ROPs
24
456
Tensor Cores
-
114
RT Cores
-
128 KB (per SM)
L1 Cache
64 KB (per SM)
72 MB
L2 Cache
384 KB
-
-
-

Theoretical Performance

443.5 GPixel/s
Pixel Rate
9.312 GPixel/s
1149 GTexel/s
Texture Rate
37.25 GTexel/s
73.54 TFLOPS
FP16 (half)
-
73.54 TFLOPS
FP32 (float)
894.0 GFLOPS
1149 GFLOPS
FP64 (double)
74.50 GFLOPS

Board Design

425W
TDP
102W
800 W
Suggested PSU
300 W
1x HDMI 2.1 3x DisplayPort 1.4a
Outputs
2x DVI 1x mini-HDMI 1.3a
1x 16-pin
Power Connectors
-

Graphics Processor

AD102
GPU Name
GF114
AD102-250-A1
GPU Variant
-
Ada Lovelace
Architecture
Fermi 2.0
TSMC
Foundry
TSMC
5 nm
Process Size
40 nm
76.3 billion
Transistors
1.95 billion
609 mm²
Die Size
332 mm²

Graphics Features

12 Ultimate (12_2)
DirectX
12 (11_0)
4.6
OpenGL
4.6
3.0
OpenCL
1.1
1.3
Vulkan
N/A
8.9
CUDA
2.1
6.7
Shader Model
5.1

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