Compare any two graphics cards:

GeForce GT 315 vs GeForce GT 430 1GB

Intro

The GeForce GT 315 uses a 40 nm design. nVidia has set 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 Rasterization Operator Units.

Compare that to the GeForce GT 430 1GB, which makes use of a 40 nm design. nVidia has set the core frequency at 700 MHz. The GDDR3 RAM runs at a frequency of 900 MHz on this specific card. It features 96 SPUs as well as 16 TAUs and 4 ROPs.

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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

As far as performance goes, the GeForce GT 430 1GB should theoretically be just a bit better than 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 small bit (approximately 12%) better at anisotropic 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

If running with a high screen resolution is important to you, then the GeForce GT 315 is the winner, by a large margin. (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 maximum amount of information (counted in MB per second) that can be transferred over the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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

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