GeForce GT 440 3GB vs Radeon HD 7790

Intro

Compare all that to the Radeon HD 7790, which has GPU core speed of 1000 MHz, and 1024 MB of GDDR5 RAM running at 1500 MHz through a 128-bit bus. It also is made up of 896 SPUs, 56 Texture Address Units, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 3GB		56 Watts
Radeon HD 7790		85 Watts
	Difference: 29 Watts (52%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7790 is 122% quicker than the GeForce GT 440 3GB overall, due to its greater bandwidth. (explain)

Radeon HD 7790		96000 MB/sec
GeForce GT 440 3GB		43200 MB/sec
	Difference: 52800 (122%)

Texel Rate

The Radeon HD 7790 is a lot (approximately 293%) better at anisotropic filtering than the GeForce GT 440 3GB. (explain)

Radeon HD 7790		56000 Mtexels/sec
GeForce GT 440 3GB		14256 Mtexels/sec
	Difference: 41744 (293%)

Pixel Rate

The Radeon HD 7790 will be a little bit (approximately 12%) faster with regards to FSAA than the GeForce GT 440 3GB, and also should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7790		16000 Mpixels/sec
GeForce GT 440 3GB		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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. The number is calculated by multiplying the interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.