Radeon HD 4890 1GB vs Radeon R7 260X

Intro

Compare all of that to the Radeon R7 260X, which features clock speeds of 1100 MHz on the GPU, and 1625 MHz on the 2048 MB of GDDR5 memory. It features 896 SPUs as well as 56 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R7 260X		115 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 75 Watts (65%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 1GB should in theory be a small bit superior to the Radeon R7 260X in general. (explain)

Radeon HD 4890 1GB		124800 MB/sec
Radeon R7 260X		104000 MB/sec
	Difference: 20800 (20%)

Texel Rate

The Radeon R7 260X should be much (approximately 54%) faster with regards to anisotropic filtering than the Radeon HD 4890 1GB. (explain)

Radeon R7 260X		61600 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 21600 (54%)

Pixel Rate

The Radeon R7 260X should be a small bit (more or less 10%) better at AA than the Radeon HD 4890 1GB, and will be capable of handling higher resolutions without losing too much performance. (explain)

Radeon R7 260X		17600 Mpixels/sec
Radeon HD 4890 1GB		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 data (counted in MB per second) that can be moved over the external memory interface within a second. It is worked out by multiplying the bus width by its memory speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics 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 number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.