GeForce GT 440 1.5GB vs Radeon HD 4890 2GB

Intro

Compare those specs to the Radeon HD 4890 2GB, which makes use of a 55 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 memory is set to run at a frequency of 975 MHz on this particular model. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 1.5GB		56 Watts
Radeon HD 4890 2GB		190 Watts
	Difference: 134 Watts (239%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4890 2GB should theoretically be a lot superior to the GeForce GT 440 1.5GB overall. (explain)

Radeon HD 4890 2GB		124800 MB/sec
GeForce GT 440 1.5GB		43200 MB/sec
	Difference: 81600 (189%)

Texel Rate

The Radeon HD 4890 2GB should be much (more or less 181%) more effective at anisotropic filtering than the GeForce GT 440 1.5GB. (explain)

Radeon HD 4890 2GB		40000 Mtexels/sec
GeForce GT 440 1.5GB		14256 Mtexels/sec
	Difference: 25744 (181%)

Pixel Rate

The Radeon HD 4890 2GB will be a little bit (more or less 12%) more effective at full screen anti-aliasing than the GeForce GT 440 1.5GB, and should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 4890 2GB		16000 Mpixels/sec
GeForce GT 440 1.5GB		14256 Mpixels/sec
	Difference: 1744 (12%)

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 maximum amount of data (counted in MB per second) that can be moved across the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, 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 number is worked out by multiplying the total number 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 applied in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.