GeForce GT 640 vs GeForce GTX 660

If you are going to buy a new graphics card and are choosing between GeForce GT 640 and GeForce GTX 660, there are a couple of things to consider. Cards with more VRAM in general perform better and allow you to play on higher graphics settings. Size also makes a difference. A model with a large heatsink can occupy up to three expansion slots on a motherboard. Be sure you have enough room in your PC case. When comparing GPUs with different architectures, more processing cores and even higher TFLOPS will not always translate to better performance. To help you decide which GPU you need, we have measured frame rates in a number of popular games. For more on how the GeForce GT 640 stacks up against GeForce GTX 660, check out specs charts below.

GeForce GT 640 Check Price

GeForce GTX 660 Check Price

Main Specs

	GeForce GT 640	GeForce GTX 660
Power consumption (TDP)	65 Watt	140 Watt
Interface	PCIe 3.0 x16	PCIe 3.0 x16
Supplementary power connectors	None	One 6-pin
Memory type	DDR3	GDDR5
Maximum RAM amount	2 GB	2 GB
Display Connectors	1x DVI, 1x HDMI, 1x DisplayPort	2x DVI, 1x HDMI, 1x DisplayPort
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GeForce GTX 660 has 115% more power consumption, than GeForce GT 640.
Both video cards are using PCIe 3.0 x16 interface connection to a motherboard.
GeForce GT 640 and GeForce GTX 660 have maximum RAM of 2 GB.
Both cards are used in Desktops.
GeForce GT 640 and GeForce GTX 660 are build with Kepler architecture.
Core clock speed of GeForce GTX 660 is 78 MHz higher, than GeForce GT 640.
GeForce GT 640 and GeForce GTX 660 are manufactured by 28 nm process technology.
GeForce GT 640 is 136 mm longer, than GeForce GTX 660.
Memory clock speed of GeForce GT 640 is 1776 MHz higher, than GeForce GTX 660.

Game benchmarks


high / 1080p	2−3	20−22
ultra / 1080p	1−2	12−14
QHD / 1440p	0−1	6−7
4K / 2160p	−	5−6
low / 720p	14−16	40−45
medium / 1080p	5−6	24−27
The average gaming FPS of GeForce GTX 660 in Assassin's Creed Odyssey is 316% more, than GeForce GT 640.
high / 1080p	7−8	30−35
ultra / 1080p	5−6	27−30
QHD / 1440p	0−1	10−12
4K / 2160p	−	8−9
low / 720p	20−22	65−70
medium / 1080p	7−8	35−40
The average gaming FPS of GeForce GTX 660 in Battlefield 5 is 310% more, than GeForce GT 640.
low / 768p	50−55	50−55
high / 1080p	35−40	−
QHD / 1440p	0−1	0−1
GeForce GT 640 and GeForce GTX 660 have the same average FPS in Call of Duty: Warzone.
low / 768p	110−120	230−240
medium / 768p	90−95	200−210
ultra / 1080p	45−50	120−130
QHD / 1440p	24−27	90−95
4K / 2160p	18−20	50−55
high / 768p	65−70	160−170
The average gaming FPS of GeForce GTX 660 in Counter-Strike: Global Offensive is 137% more, than GeForce GT 640.
low / 768p	70−75	60−65
ultra / 1080p	21−24	50−55
medium / 1080p	45−50	55−60
The average gaming FPS of GeForce GTX 660 in Cyberpunk 2077 is 21% more, than GeForce GT 640.
low / 768p	70−75	120−130
medium / 768p	50−55	100−110
ultra / 1080p	27−30	80−85
The average gaming FPS of GeForce GTX 660 in Dota 2 is 103% more, than GeForce GT 640.
high / 1080p	3−4	24−27
ultra / 1080p	3−4	21−24
QHD / 1440p	−	18−20
4K / 2160p	2−3	8−9
low / 720p	14−16	50−55
medium / 1080p	4−5	27−30
The average gaming FPS of GeForce GTX 660 in Far Cry 5 is 440% more, than GeForce GT 640.
high / 1080p	10−12	30−35
ultra / 1080p	5−6	24−27
QHD / 1440p	2−3	16−18
low / 720p	50−55	120−130
medium / 1080p	16−18	70−75
The average gaming FPS of GeForce GTX 660 in Fortnite is 217% more, than GeForce GT 640.
high / 1080p	6−7	30−35
ultra / 1080p	−	24−27
QHD / 1440p	4−5	14−16
4K / 2160p	2−3	12−14
low / 720p	21−24	65−70
medium / 1080p	9−10	35−40
The average gaming FPS of GeForce GTX 660 in Forza Horizon 4 is 266% more, than GeForce GT 640.
low / 768p	45−50	100−110
medium / 768p	−	90−95
high / 1080p	7−8	40−45
ultra / 1080p	3−4	16−18
QHD / 1440p	0−1	7−8
medium / 720p	40−45	−
The average gaming FPS of GeForce GTX 660 in Grand Theft Auto V is 184% more, than GeForce GT 640.
high / 1080p	2−3	12−14
ultra / 1080p	0−1	10−11
QHD / 1440p	−	10−11
4K / 2160p	0−1	3−4
low / 720p	8−9	40−45
medium / 1080p	4−5	18−20
The average gaming FPS of GeForce GTX 660 in Metro Exodus is 380% more, than GeForce GT 640.
low / 768p	80−85	120−130
ultra / 1080p	70−75	−
medium / 1080p	−	110−120
The average gaming FPS of GeForce GTX 660 in Minecraft is 52% more, than GeForce GT 640.
ultra / 1080p	12−14	14−16
low / 720p	27−30	70−75
medium / 1080p	14−16	18−20
The average gaming FPS of GeForce GTX 660 in PLAYERUNKNOWN'S BATTLEGROUNDS is 94% more, than GeForce GT 640.
high / 1080p	6−7	14−16
ultra / 1080p	4−5	10−11
QHD / 1440p	0−1	1−2
4K / 2160p	−	1−2
low / 720p	7−8	35−40
medium / 1080p	−	21−24
The average gaming FPS of GeForce GTX 660 in Red Dead Redemption 2 is 250% more, than GeForce GT 640.
low / 768p	14−16	70−75
medium / 768p	10−11	45−50
high / 1080p	5−6	24−27
ultra / 1080p	4−5	14−16
4K / 2160p	0−1	8−9
The average gaming FPS of GeForce GTX 660 in The Witcher 3: Wild Hunt is 400% more, than GeForce GT 640.
low / 768p	70−75	90−95
medium / 768p	35−40	60−65
ultra / 1080p	16−18	40−45
high / 768p	30−35	55−60
The average gaming FPS of GeForce GTX 660 in World of Tanks is 61% more, than GeForce GT 640.

Full Specs

	GeForce GT 640	GeForce GTX 660
Architecture	Kepler	Kepler
Code name	GK107	GK106
Type	Desktop	Desktop
Release date	5 June 2012	6 September 2012
Pipelines	384	960
Core clock speed	902 MHz	980 MHz
Boost Clock		1033 MHz
Transistor count	1,270 million	2,540 million
Manufacturing process technology	28 nm	28 nm
Texture fill rate	28.86	78.4 billion/sec
Floating-point performance	692.7 gflops	1,981 gflops
Length	145 mm	9.5" (24.1 cm)
Memory bus width	128 Bit	192-bit GDDR5
Memory clock speed	1782 MHz	6.0 GB/s
Memory bandwidth	28.51 GB/s	144.2 GB/s
DirectX	12 (11_0)	12 (11_0)
Shader Model	5.1	5.1
OpenGL	4.6	4.3
OpenCL	1.2	1.2
Vulkan	1.1.126	1.1.126
CUDA	3.0	+
CUDA cores		960
Bus support		PCI Express 3.0
Height		4.376" (11.1 cm)
SLI options		+
Multi monitor support		4 displays
HDMI		+
HDCP		+
Maximum VGA resolution		2048x1536
Audio input for HDMI		Internal
3D Blu-Ray		+
3D Gaming		+
3D Vision		+
Bitcoin / BTC (SHA256)	24 Mh/s	66 Mh/s
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GeForce GT 640 vs GeForce GTX 660

Main Specs

Game benchmarks

Full Specs

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