Compare any two graphics cards:

GeForce GT 315 vs GeForce GT 430 1GB

Intro

The GeForce GT 315 makes use of a 40 nm design. nVidia has clocked the core frequency at 625 MHz. The DDR3 memory runs at a speed of 790 MHz on this card. It features 48 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare all of that to the GeForce GT 430 1GB, which has a GPU core clock speed of 700 MHz, and 1024 MB of GDDR3 memory set to run at 900 MHz through a 128-bit bus. It also is comprised of 96 Stream Processors, 16 Texture Address Units, and 4 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 315		52 Watts
GeForce GT 430 1GB		60 Watts
	Difference: 8 Watts (15%)

Memory Bandwidth

Performance-wise, the GeForce GT 430 1GB should theoretically be a small bit superior to the GeForce GT 315 in general. (explain)

GeForce GT 430 1GB		28800 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 3520 (14%)

Texel Rate

The GeForce GT 430 1GB should be a little bit (more or less 12%) better at texture filtering than the GeForce GT 315. (explain)

GeForce GT 430 1GB		11200 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 1200 (12%)

Pixel Rate

The GeForce GT 315 should be quite a bit (more or less 79%) more effective at AA than the GeForce GT 430 1GB, and will be able to handle higher screen resolutions more effectively. (explain)

GeForce GT 315		5000 Mpixels/sec
GeForce GT 430 1GB		2800 Mpixels/sec
	Difference: 2200 (79%)

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 315

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GeForce GT 430 1GB

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Specifications

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Model	GeForce GT 315	GeForce GT 430 1GB
Manufacturer	nVidia	nVidia
Year	November 2009	October 2010
Code Name	GT216	GF108
Memory	512 MB	1024 MB
Core Speed	625 MHz	700 MHz
Memory Speed	1580 MHz	1800 MHz
Power (Max TDP)	52 watts	60 watts
Bandwidth	25280 MB/sec	28800 MB/sec
Texel Rate	10000 Mtexels/sec	11200 Mtexels/sec
Pixel Rate	5000 Mpixels/sec	2800 Mpixels/sec
Unified Shaders	48	96
Texture Mapping Units	16	16
Render Output Units	8	4
Bus Type	DDR3	GDDR3
Bus Width	128-bit	128-bit
Fab Process	40 nm	40 nm
Transistors	486 million	585 million
Bus	PCIe 2.0	PCIe x16
DirectX Version	DirectX 10.1	DirectX 11
OpenGL Version	OpenGL 3.2	OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum 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 speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

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