GeForce GTX 950 vs Radeon HD 4890 1GB

Intro

Compare those specifications to the Radeon HD 4890 1GB, which comes with core speeds of 1000 MHz on the GPU, and 975 MHz on the 1024 MB of GDDR5 memory. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 950		90 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 100 Watts (111%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4890 1GB should theoretically be a small bit better than the GeForce GTX 950 in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
GeForce GTX 950		105728 MB/sec
	Difference: 19072 (18%)

Texel Rate

The GeForce GTX 950 will be much (more or less 23%) more effective at anisotropic filtering than the Radeon HD 4890 1GB. (explain)

GeForce GTX 950		49152 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 9152 (23%)

Pixel Rate

The GeForce GTX 950 should be much (about 105%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and capable of handling higher resolutions without losing too much performance. (explain)

GeForce GTX 950		32768 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 16768 (105%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total number of texture units of the card 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.