Radeon HD 4890 1GB vs Radeon R7 260X

Intro

Compare those specifications to the Radeon R7 260X, which comes with core 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 TAUs 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

In theory, the Radeon HD 4890 1GB should be 20% quicker than the Radeon R7 260X overall, because of its greater data rate. (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 (about 54%) faster with regards to 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

If running with a high screen resolution is important to you, then the Radeon R7 260X is a better choice, though only just barely. (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: Memory bandwidth is the maximum amount of data (counted in MB per second) that can be transported past the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If the card has DDR memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card 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 core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant 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 max fill rate.