Compare any two graphics cards:

GeForce GT 315 vs Radeon R7 240

Intro

The GeForce GT 315 uses a 40 nm design. nVidia has clocked the core frequency at 625 MHz. The DDR3 RAM is set to run at a speed of 790 MHz on this specific card. It features 48 SPUs along with 16 Texture Address Units and 8 ROPs.

Compare those specifications to the Radeon R7 240, which has a core clock frequency of 730 MHz and a DDR3 memory frequency of 900 MHz. It also makes use of a 128-bit bus, and makes use of a 28 nm design. It is made up of 320 SPUs, 20 Texture Address Units, and 8 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 240		30 Watts
GeForce GT 315		52 Watts
	Difference: 22 Watts (73%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 240 should perform a small bit faster than the GeForce GT 315 overall. (explain)

Radeon R7 240		28800 MB/sec
GeForce GT 315		25280 MB/sec
	Difference: 3520 (14%)

Texel Rate

The Radeon R7 240 is quite a bit (about 46%) more effective at texture filtering than the GeForce GT 315. (explain)

Radeon R7 240		14600 Mtexels/sec
GeForce GT 315		10000 Mtexels/sec
	Difference: 4600 (46%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon R7 240 is superior to the GeForce GT 315, though not by far. (explain)

Radeon R7 240		5840 Mpixels/sec
GeForce GT 315		5000 Mpixels/sec
	Difference: 840 (17%)

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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Radeon R7 240

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Specifications

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Model	GeForce GT 315	Radeon R7 240
Manufacturer	nVidia	AMD
Year	November 2009	October 2013
Code Name	GT216	Oland PRO
Memory	512 MB	2048 MB
Core Speed	625 MHz	730 MHz
Memory Speed	1580 MHz	1800 MHz
Power (Max TDP)	52 watts	30 watts
Bandwidth	25280 MB/sec	28800 MB/sec
Texel Rate	10000 Mtexels/sec	14600 Mtexels/sec
Pixel Rate	5000 Mpixels/sec	5840 Mpixels/sec
Unified Shaders	48	320
Texture Mapping Units	16	20
Render Output Units	8	8
Bus Type	DDR3	DDR3
Bus Width	128-bit	128-bit
Fab Process	40 nm	28 nm
Transistors	486 million	1040 million
Bus	PCIe 2.0	PCIe 3.0 x16
DirectX Version	DirectX 10.1	DirectX 11.2
OpenGL Version	OpenGL 3.2	OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of information (in units of megabytes per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the card's bus width by its memory speed. If it uses DDR RAM, it must be multiplied by 2 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, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated 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 rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

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