GeForce GT 440 1.5GB vs Radeon HD 4770

Intro

Compare all of that to the Radeon HD 4770, which comes with core speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 440 1.5GB		56 Watts
Radeon HD 4770		80 Watts
	Difference: 24 Watts (43%)

Memory Bandwidth

In theory, the Radeon HD 4770 will be 19% quicker than the GeForce GT 440 1.5GB overall, due to its higher bandwidth. (explain)

Radeon HD 4770		51200 MB/sec
GeForce GT 440 1.5GB		43200 MB/sec
	Difference: 8000 (19%)

Texel Rate

The Radeon HD 4770 will be quite a bit (about 68%) more effective at texture filtering than the GeForce GT 440 1.5GB. (explain)

Radeon HD 4770		24000 Mtexels/sec
GeForce GT 440 1.5GB		14256 Mtexels/sec
	Difference: 9744 (68%)

Pixel Rate

The GeForce GT 440 1.5GB is a small bit (more or less 19%) faster with regards to anti-aliasing than the Radeon HD 4770, and also will be capable of handling higher screen resolutions better. (explain)

GeForce GT 440 1.5GB		14256 Mpixels/sec
Radeon HD 4770		12000 Mpixels/sec
	Difference: 2256 (19%)

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 megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the bus width by its memory clock speed. In the case of DDR RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.