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GeForce GT 640 DDR3 vs GeForce GTS 450

Intro

The GeForce GT 640 DDR3 comes with clock speeds of 900 MHz on the GPU, and 1782 MHz on the 2048 MB of DDR3 RAM. It features 384 SPUs along with 32 TAUs and 16 ROPs.

Compare those specs to the GeForce GTS 450, which makes use of a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 memory works at a speed of 902 MHz on this model. It features 192 SPUs along with 32 TAUs and 16 Rasterization Operator Units.

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

GeForce GT 640 DDR3		1560 points
GeForce GTS 450		1453 points
	Difference: 107 (7%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 640 DDR3		65 Watts
GeForce GTS 450		106 Watts
	Difference: 41 Watts (63%)

Memory Bandwidth

The GeForce GTS 450 should in theory be a little bit faster than the GeForce GT 640 DDR3 overall. (explain)

GeForce GTS 450		57728 MB/sec
GeForce GT 640 DDR3		57024 MB/sec
	Difference: 704 (1%)

Texel Rate

The GeForce GT 640 DDR3 should be a little bit (approximately 15%) more effective at anisotropic filtering than the GeForce GTS 450. (explain)

GeForce GT 640 DDR3		28800 Mtexels/sec
GeForce GTS 450		25056 Mtexels/sec
	Difference: 3744 (15%)

Pixel Rate

The GeForce GT 640 DDR3 is just a bit (more or less 15%) better at full screen anti-aliasing than the GeForce GTS 450, and should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GT 640 DDR3		14400 Mpixels/sec
GeForce GTS 450		12528 Mpixels/sec
	Difference: 1872 (15%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

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GeForce GT 640 DDR3

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GeForce GTS 450

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Specifications

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Model	GeForce GT 640 DDR3	GeForce GTS 450
Manufacturer	nVidia	nVidia
Year	June 2012	September 2010
Code Name	GK107	GF106
Memory	2048 MB	512 MB
Core Speed	900 MHz	783 MHz
Memory Speed	3564 MHz	3608 MHz
Power (Max TDP)	65 watts	106 watts
Bandwidth	57024 MB/sec	57728 MB/sec
Texel Rate	28800 Mtexels/sec	25056 Mtexels/sec
Pixel Rate	14400 Mpixels/sec	12528 Mpixels/sec
Unified Shaders	384	192
Texture Mapping Units	32	32
Render Output Units	16	16
Bus Type	DDR3	GDDR5
Bus Width	128-bit	128-bit
Fab Process	28 nm	40 nm
Transistors	1300 million	1170 million
Bus	PCIe 3.0 x16	PCIe x16
DirectX Version	DirectX 11.0	DirectX 11
OpenGL Version	OpenGL 4.2	OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

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