Radeon HD 4890 2GB vs Radeon R7 260X

Intro

Compare those specs to the Radeon R7 260X, which has a clock frequency of 1100 MHz and a GDDR5 memory frequency of 1625 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is comprised of 896 SPUs, 56 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 260X		115 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 75 Watts (65%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 4890 2GB should be 20% faster than the Radeon R7 260X overall, due to its greater data rate. (explain)

Radeon HD 4890 2GB		124800 MB/sec
Radeon R7 260X		104000 MB/sec
	Difference: 20800 (20%)

Texel Rate

The Radeon R7 260X should be much (about 54%) more effective at texture filtering than the Radeon HD 4890 2GB. (explain)

Radeon R7 260X		61600 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 21600 (54%)

Pixel Rate

The Radeon R7 260X should be a bit (more or less 10%) more effective at full screen anti-aliasing than the Radeon HD 4890 2GB, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon R7 260X		17600 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 1600 (10%)

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 max amount of information (in units of MB per second) that can be transported across the external memory interface in a second. The number is worked out by multiplying the interface width by its memory clock speed. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be processed per second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the video 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 could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.