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GeForce GT 315 vs GeForce GT 430 1GB

Intro

The GeForce GT 315 comes with a GPU core clock speed of 625 MHz, and the 512 MB of DDR3 RAM is set to run at 790 MHz through a 128-bit bus. It also features 48 Stream Processors, 16 Texture Address Units, and 8 Raster Operation Units.

Compare all that to the GeForce GT 430 1GB, which comes with a core clock frequency of 700 MHz and a GDDR3 memory speed of 900 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It is made up of 96 SPUs, 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

In theory, the GeForce GT 430 1GB is 14% quicker than the GeForce GT 315 overall, due to its higher data rate. (explain)

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

Texel Rate

The GeForce GT 430 1GB will be a bit (approximately 12%) faster with regards to 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 (about 79%) more effective at anti-aliasing than the GeForce GT 430 1GB, and also able to handle higher screen resolutions without slowing down too much. (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: Bandwidth is the maximum amount of information (in units of MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the interface width by the speed of its memory. In the case of DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes 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 - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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