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GeForce GTX 950 vs Radeon HD 4870 2GB

Intro

The GeForce GTX 950 features a GPU core clock speed of 1024 MHz, and the 2048 MB of GDDR5 memory is set to run at 1652 MHz through a 128-bit bus. It also features 768 Stream Processors, 48 Texture Address Units, and 32 Raster Operation Units.

Compare those specifications to the Radeon HD 4870 2GB, which makes use of a 55 nm design. AMD has set the core frequency at 750 MHz. The GDDR5 RAM runs at a frequency of 900 MHz on this specific model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 950		90 Watts
Radeon HD 4870 2GB		150 Watts
	Difference: 60 Watts (67%)

Memory Bandwidth

In theory, the Radeon HD 4870 2GB should be a little bit faster than the GeForce GTX 950 overall. (explain)

Radeon HD 4870 2GB		115200 MB/sec
GeForce GTX 950		105728 MB/sec
	Difference: 9472 (9%)

Texel Rate

The GeForce GTX 950 will be much (about 64%) more effective at AF than the Radeon HD 4870 2GB. (explain)

GeForce GTX 950		49152 Mtexels/sec
Radeon HD 4870 2GB		30000 Mtexels/sec
	Difference: 19152 (64%)

Pixel Rate

If using high levels of AA is important to you, then the GeForce GTX 950 is the winner, by a large margin. (explain)

GeForce GTX 950		32768 Mpixels/sec
Radeon HD 4870 2GB		12000 Mpixels/sec
	Difference: 20768 (173%)

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 GTX 950

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Radeon HD 4870 2GB

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Specifications

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Model	GeForce GTX 950	Radeon HD 4870 2GB
Manufacturer	nVidia	AMD
Year	August 2015	Jun 25, 2008
Code Name	GM206	RV770 XT
Memory	2048 MB	2048 MB
Core Speed	1024 MHz	750 MHz
Memory Speed	6608 MHz	3600 MHz
Power (Max TDP)	90 watts	150 watts
Bandwidth	105728 MB/sec	115200 MB/sec
Texel Rate	49152 Mtexels/sec	30000 Mtexels/sec
Pixel Rate	32768 Mpixels/sec	12000 Mpixels/sec
Unified Shaders	768	800(160x5)
Texture Mapping Units	48	40
Render Output Units	32	16
Bus Type	GDDR5	GDDR5
Bus Width	128-bit	256-bit
Fab Process	28 nm	55 nm
Transistors	2940 million	956 million
Bus	PCIe 3.0 x16	PCIe 2.0 x16
DirectX Version	DirectX 12.0	DirectX 10.1
OpenGL Version	OpenGL 4.5	OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in MB per second) that can be transferred over the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If it uses 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 higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This is calculated by multiplying the total amount of texture units by the core 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the the core 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 output rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

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