Radeon HD 4890 2GB vs Radeon R7 260X

Intro

Compare all of that to the Radeon R7 260X, which has a clock frequency of 1100 MHz and a GDDR5 memory frequency of 1625 MHz. It also uses a 128-bit memory bus, and uses a 28 nm design. It features 896 SPUs, 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 2GB		190 Watts
	Difference: 75 Watts (65%)

Memory Bandwidth

In theory, the Radeon HD 4890 2GB is 20% quicker than the Radeon R7 260X overall, because of its higher bandwidth. (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 a lot (about 54%) better at AF 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 will be a little bit (approximately 10%) better at FSAA than the Radeon HD 4890 2GB, and also should be able to handle higher screen resolutions while still performing well. (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: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 texture map elements (texels) that can be processed in one second. This is calculated 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 applied in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.