GeForce GTX 950 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which comes with a GPU core clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 975 MHz through a 256-bit bus. It also is made up of 800(160x5) Stream Processors, 40 TAUs, and 16 Raster Operation Units.

Display Graphs

Hide Graphs

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

Performance-wise, the Radeon HD 4890 1GB should theoretically be a small bit superior to the GeForce GTX 950 overall. (explain)

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

Texel Rate

The GeForce GTX 950 should be quite a bit (more or less 23%) faster with regards to 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 is quite a bit (about 105%) faster with regards to AA than the Radeon HD 4890 1GB, and also will be able to handle higher resolutions more effectively. (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: Bandwidth is the largest amount of data (measured in megabytes per second) that can be moved past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the video 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 number of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.