GeForce GTX Titan Black vs Radeon HD 4890 2GB

Intro

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

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

The GeForce GTX Titan Black, in theory, should be much faster than the Radeon HD 4890 2GB overall. (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 will be a lot (about 433%) better 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

The GeForce GTX Titan Black will be quite a bit (more or less 167%) more effective at FSAA than the Radeon HD 4890 2GB, and should be capable of handling higher resolutions better. (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 largest amount of information (measured in megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, 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 figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.