NVIDIA GeForce GT 645 vs NVIDIA GeForce GTX 660 Full Specs

Summary

288 Shaders 776MHz	960 Shaders 1.08GHz
1GB GDDR591.9GB/s	2GB GDDR5144.2GB/s
Peak·FP32·FP16 894 GFLOPS	Peak·FP32·FP16 2.08 TFLOPS
Form Factor PCIe Card	Form Factor PCIe Card
TDP 140W	TDP 140W
Power Connectors -	Power Connectors 1x 6-Pin

Highlights

Peak OPS

Peak OPS FP32 FP64 Memory Bandwidth TDP

GeForce GT 645894 GFLOPSFP32

x1

GeForce GTX 6602.08 TFLOPSFP32

x2.33

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Theoretical Performance

Clock Speed776MHz UC·Boost·OC	Clock Speed1084MHz UC·Base·Boost·OC
Peak OPS 894 GFLOPSFP32	Peak OPS 2.08 TFLOPSFP32
FP32 894 GFLOPS	FP32 2.08 TFLOPS
FP64 74.5 GFLOPS	FP64 86.72 GFLOPS
Pixel Rate 37.3 GPixel/s	Pixel Rate 26 GPixel/s
Texture Rate 74.5 GTexel/s	Texture Rate 86.7 GTexel/s

Core Config

Shaders 288 Shaders	Shaders 960 Shaders
TMUs 48 TMUs	TMUs 80 TMUs
ROPs 24 ROPs	ROPs 24 ROPs
SMs 6 SMs	SMs 5 SMs

Clocks

Base Clock -	Base Clock 980MHz
Boost Clock 776MHz	Boost Clock 1.08GHz
Shader Clock 1.55GHz	Shader Clock -

Cache

L2 Cache 512KB shared

L2 Cache 512KB shared

Memory

1GB GDDR5	2GB GDDR5
Memory Bus 192-bit	Memory Bus 192-bit
Memory Speed 3.8GT/s	Memory Speed 6GT/s
Memory Bandwidth 91.9GB/s	Memory Bandwidth 144.2GB/s

Power & Thermals

TDP 140W

TDP 140W

Video Output

Multi-Monitor 2

Multi-Monitor 3

Ports

-	1x DisplayPort 1.2
-	1x HDMI 1.4
1x Mini HDMI 1.3	-
-	1x DVI-D Dual-Link
2x DVI-I Dual-Link	1x DVI-I Dual-Link

Encoder

-	Encoder Model NVENC 1

Decoder

Decoder Model VP4

Decoder Model NVDEC 1

Card

Form Factor PCIe Card	Form Factor PCIe Card
PCIe 2-Slots	PCIe 2-Slots
Height 111 mm (4.37") Width 210 mm (8.27") Depth 38 mm (1.5")	Height 111 mm (4.37") Width 241 mm (9.49") Depth 38 mm (1.5")
Cooling Open-Air 1x Fan	Cooling Blower 1x Fan
Power Connectors -	Power Connectors 1x 6-Pin

Chip

Manufacturer NVIDIA	Manufacturer NVIDIA
Chip Designer NVIDIA	Chip Designer NVIDIA
Architecture Fermi	Architecture Kepler
Family GeForce 600	Family GeForce 600
Branding	Branding
Codename NVCE	Codename NVE6
Market Segment Desktop	Market Segment Desktop
Release Date Apr 24, 2012	Release Date Sep 13, 2012

Fabrication

Foundry TSMC	Foundry TSMC
Fabrication Node 40nm	Fabrication Node 28nm
Die Size 332mm²	Die Size 221mm²
Transistor Count 1.9 Billion	Transistor Count 2.5 Billion
Transistor Density 5.87 MTr/mm²	Transistor Density 11.49 MTr/mm²

Images

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Competitors

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