NVIDIA GeForce GT 640 1GB vs NVIDIA GeForce GT 645 Full Specs

Summary

384 Shaders 797MHz	288 Shaders 776MHz
1GB DDR328.5GB/s	1GB GDDR591.9GB/s
Peak·FP32·FP16 612.1 GFLOPS	Peak·FP32·FP16 894 GFLOPS
Form Factor PCIe Card	Form Factor PCIe Card
TDP 50W	TDP 140W

Highlights

Peak OPS

Peak OPS FP32 FP64 Memory Bandwidth TDP

GeForce GT 640 1GB612.1 GFLOPSFP32

x1

GeForce GT 645894 GFLOPSFP32

x1.46

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Theoretical Performance

Clock Speed797MHz UC·Boost·OC	Clock Speed776MHz UC·Boost·OC
Peak OPS 612.1 GFLOPSFP32	Peak OPS 894 GFLOPSFP32
FP32 612.1 GFLOPS	FP32 894 GFLOPS
FP64 25.5 GFLOPS	FP64 74.5 GFLOPS
Pixel Rate 12.8 GPixel/s	Pixel Rate 37.3 GPixel/s
Texture Rate 25.5 GTexel/s	Texture Rate 74.5 GTexel/s

Core Config

Shaders 384 Shaders	Shaders 288 Shaders
TMUs 32 TMUs	TMUs 48 TMUs
ROPs 16 ROPs	ROPs 24 ROPs
SMs 2 SMs	SMs 6 SMs

Clocks

Boost Clock 797MHz	Boost Clock 776MHz
Shader Clock -	Shader Clock 1.55GHz

Cache

L2 Cache 256KB shared

L2 Cache 512KB shared

Memory

1GB DDR3	1GB GDDR5
Memory Bus 128-bit	Memory Bus 192-bit
Memory Speed 1.8GT/s	Memory Speed 3.8GT/s
Memory Bandwidth 28.5GB/s	Memory Bandwidth 91.9GB/s

Power & Thermals

TDP 50W

TDP 140W

Video Output

Multi-Monitor 2

Multi-Monitor 2

Ports

1x HDMI 1.4	-
-	1x Mini HDMI 1.3
1x DVI-I Dual-Link	2x DVI-I Dual-Link
1x VGA	-

Encoder

Encoder Model NVENC 1

-

Decoder

Decoder Model NVDEC 1

Decoder Model VP4

Card

Form Factor PCIe Card	Form Factor PCIe Card
PCIe 1.5-Slots	PCIe 2-Slots
Height 111 mm (4.37") Width 145 mm (5.71") Depth 30 mm (1.18")	Height 111 mm (4.37") Width 210 mm (8.27") Depth 38 mm (1.5")
Cooling Open-Air 1x Fan	Cooling Open-Air 1x Fan

Chip

Manufacturer NVIDIA	Manufacturer NVIDIA
Chip Designer NVIDIA	Chip Designer NVIDIA
Architecture Kepler	Architecture Fermi
Family GeForce 600	Family GeForce 600
Branding	Branding
Codename NVE7	Codename NVCE
Market Segment Desktop	Market Segment Desktop
Release Date Apr 24, 2012	Release Date Apr 24, 2012

Fabrication

Foundry TSMC	Foundry TSMC
Fabrication Node 28nm	Fabrication Node 40nm
Die Size 118mm²	Die Size 332mm²
Transistor Count 1.3 Billion	Transistor Count 1.9 Billion
Transistor Density 10.76 MTr/mm²	Transistor Density 5.87 MTr/mm²

Images

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Competitors

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