GeForce GTX Titan Black vs Radeon HD 4890 2GB

Intro

Compare that to the Radeon HD 4890 2GB, which features a clock frequency of 1000 MHz and a GDDR5 memory frequency of 975 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4890 2GB		190 Watts
GeForce GTX Titan Black		250 Watts
	Difference: 60 Watts (32%)

Memory Bandwidth

Theoretically, the GeForce GTX Titan Black should perform much faster than the Radeon HD 4890 2GB in general. (explain)

GeForce GTX Titan Black		336000 MB/sec
Radeon HD 4890 2GB		124800 MB/sec
	Difference: 211200 (169%)

Texel Rate

The GeForce GTX Titan Black is quite a bit (about 433%) more effective at anisotropic filtering than the Radeon HD 4890 2GB. (explain)

GeForce GTX Titan Black		213360 Mtexels/sec
Radeon HD 4890 2GB		40000 Mtexels/sec
	Difference: 173360 (433%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTX Titan Black is the winner, by a large margin. (explain)

GeForce GTX Titan Black		42672 Mpixels/sec
Radeon HD 4890 2GB		16000 Mpixels/sec
	Difference: 26672 (167%)

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 (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. 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, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.