Radeon HD 4890 1GB vs Radeon R7 260X

Intro

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

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

In theory, the Radeon HD 4890 1GB should perform a little bit faster than the Radeon R7 260X overall. (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 a lot (more or less 54%) more effective at AF 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 (about 10%) better at anti-aliasing than the Radeon HD 4890 1GB, and also should be capable of handling higher screen resolutions without slowing down too much. (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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units by the core speed of the chip. The higher this number, the better the video card will be at 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 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 amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.