Geforce GTX 760 vs Radeon HD 4890 1GB

Intro

Compare those specs to the Radeon HD 4890 1GB, which makes use of a 55 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory works at a speed of 975 MHz on this card. It features 800(160x5) SPUs along with 40 TAUs 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

Performance-wise, the Geforce GTX 760 should theoretically be a lot superior to the Radeon HD 4890 1GB in general. (explain)

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

Texel Rate

The Geforce GTX 760 is a lot (more or less 135%) faster with regards to anisotropic filtering 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

If using a high screen resolution is important to you, then the Geforce GTX 760 is superior to the Radeon HD 4890 1GB, by far. (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: Bandwidth is the largest amount of information (counted in MB per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.