Geforce GTX 760 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which uses a 55 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM runs at a speed of 975 MHz on this model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Geforce GTX 760		170 Watts
Radeon HD 4890 1GB		190 Watts
	Difference: 20 Watts (12%)

Memory Bandwidth

In theory, the Geforce GTX 760 is 54% faster than the Radeon HD 4890 1GB overall, due to its higher data rate. (explain)

Geforce GTX 760		192256 MB/sec
Radeon HD 4890 1GB		124800 MB/sec
	Difference: 67456 (54%)

Texel Rate

The Geforce GTX 760 is much (about 135%) better at AF than the Radeon HD 4890 1GB. (explain)

Geforce GTX 760		94080 Mtexels/sec
Radeon HD 4890 1GB		40000 Mtexels/sec
	Difference: 54080 (135%)

Pixel Rate

The Geforce GTX 760 is much (approximately 96%) better at anti-aliasing than the Radeon HD 4890 1GB, and also should be capable of handling higher screen resolutions more effectively. (explain)

Geforce GTX 760		31360 Mpixels/sec
Radeon HD 4890 1GB		16000 Mpixels/sec
	Difference: 15360 (96%)

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 largest amount of information (counted in MB per second) that can be transferred across the external memory interface in one second. It is calculated by multiplying the card's interface width by its memory speed. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The better this number, the better the graphics 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 maximum amount of pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.