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GeForce GTX 950 vs Radeon HD 4870 2GB

Intro

The GeForce GTX 950 features a clock frequency of 1024 MHz and a GDDR5 memory speed of 1652 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It features 768 SPUs, 48 Texture Address Units, and 32 Raster Operation Units.

Compare all of that to the Radeon HD 4870 2GB, which comes with a clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also uses a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation 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

Theoretically speaking, the Radeon HD 4870 2GB will be 9% faster than the GeForce GTX 950 in general, due to its greater bandwidth. (explain)

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

Texel Rate

The GeForce GTX 950 is a lot (about 64%) more effective at texture filtering 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 running with lots of anti-aliasing is important to you, then the GeForce GTX 950 is a better choice, by far. (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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This number is worked out by multiplying the total texture units by the core speed of the chip. The higher this number, 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 amount of pixels that the graphics chip could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.

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