NVIDIA GeForce GT 640 GDDR5 vs NVIDIA GeForce GTX 660 GK104 Full Specs

Summary

384 Shaders 950MHz	1,152 Shaders 899MHz
1GB GDDR580GB/s	2GB GDDR5139.2GB/s
Peak·FP32·FP16 729.6 GFLOPS	Peak·FP32·FP16 2.07 TFLOPS
Form Factor PCIe Card	Form Factor PCIe Card
TDP 75W	TDP 130W
Power Connectors -	Power Connectors 1x 6-Pin

Highlights

Peak OPS

Peak OPS FP32 FP64 Memory Bandwidth TDP

GeForce GT 640 GDDR5729.6 GFLOPSFP32

x1

GeForce GTX 660 GK1042.07 TFLOPSFP32

x2.84

Show Top Score

Theoretical Performance

Clock Speed950MHz UC·Boost·OC	Clock Speed899MHz UC·Base·Boost·OC
Peak OPS 729.6 GFLOPSFP32	Peak OPS 2.07 TFLOPSFP32
FP32 729.6 GFLOPS	FP32 2.07 TFLOPS
FP64 30.4 GFLOPS	FP64 86.3 GFLOPS
Pixel Rate 15.2 GPixel/s	Pixel Rate 21.6 GPixel/s
Texture Rate 30.4 GTexel/s	Texture Rate 86.3 GTexel/s

Core Config

Shaders 384 Shaders	Shaders 1,152 Shaders
TMUs 32 TMUs	TMUs 96 TMUs
ROPs 16 ROPs	ROPs 24 ROPs
SMs 2 SMs	SMs 6 SMs

Clocks

Base Clock -	Base Clock 824MHz
Boost Clock 950MHz	Boost Clock 899MHz

Cache

L2 Cache 256KB shared

L2 Cache 512KB shared

Memory

1GB GDDR5	2GB GDDR5
Memory Bus 128-bit	Memory Bus 192-bit
Memory Speed 5GT/s	Memory Speed 5.8GT/s
Memory Bandwidth 80GB/s	Memory Bandwidth 139.2GB/s
ECC No	ECC No

Power & Thermals

TDP 75W

TDP 130W

Video Output

Multi-Monitor 2

Multi-Monitor 3

Ports

-	1x DisplayPort 1.2
1x HDMI 1.4	1x HDMI 1.4
-	1x DVI-D Dual-Link
1x DVI-I Dual-Link	1x DVI-I Dual-Link
1x VGA	-

Encoder

Encoder Model NVENC 1

Encoder Model NVENC 1

Decoder

Decoder Model NVDEC 1

Decoder Model NVDEC 1

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 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 Kepler	Architecture Kepler
Family GeForce 600	Family GeForce 600
Branding	Branding
Codename NVE7	Codename NVE4
Chip Variant -	Chip Variant GK104-200-KD-A2
Market Segment Desktop	Market Segment Desktop
Release Date Apr 24, 2012	Release Date Aug 22, 2012

Fabrication

Foundry TSMC	Foundry TSMC
Fabrication Node 28nm	Fabrication Node 28nm
Die Size 118mm²	Die Size 294mm²
Transistor Count 1.3 Billion	Transistor Count 3.5 Billion
Transistor Density 10.76 MTr/mm²	Transistor Density 12.04 MTr/mm²

Images

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Competitors

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NVIDIAGeForce GTX 660 GK104 vs GPU AMDRadeon RX 7400 NVIDIAGeForce GTX 660 GK104 vs GPU AMDRadeon RX 9060 NVIDIAGeForce GTX 660 GK104 vs GPU MSIGeForce RTX 3050 LP 6G OC Show 12 more