GeForce GTX Titan Black vs Radeon HD 4890 2GB

Intro

Compare that to the Radeon HD 4890 2GB, 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 particular model. It features 800(160x5) SPUs along with 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

In theory, the GeForce GTX Titan Black should be 169% quicker than the Radeon HD 4890 2GB overall, because of its higher data rate. (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 (more or less 433%) faster with regards to texture 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 running with a high screen resolution is important to you, then the GeForce GTX Titan Black is the winner, by far. (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: Bandwidth is the max amount of data (counted in MB per second) that can be moved past the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 texture map elements (texels) that are applied per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the video 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 number of pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.