Geforce GTX 770 vs Radeon HD 4830 1GB

Intro

Compare that to the Radeon HD 4830 1GB, which comes with GPU clock speed of 575 MHz, and 1024 MB of GDDR4 memory set to run at 900 MHz through a 256-bit bus. It also is made up of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 1GB		95 Watts
Geforce GTX 770		230 Watts
	Difference: 135 Watts (142%)

Memory Bandwidth

The Geforce GTX 770 should in theory perform a lot faster than the Radeon HD 4830 1GB overall. (explain)

Geforce GTX 770		224384 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 166784 (290%)

Texel Rate

The Geforce GTX 770 should be much (about 628%) better at AF than the Radeon HD 4830 1GB. (explain)

Geforce GTX 770		133888 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 115488 (628%)

Pixel Rate

The Geforce GTX 770 will be much (approximately 264%) better at FSAA than the Radeon HD 4830 1GB, and also will be capable of handling higher screen resolutions more effectively. (explain)

Geforce GTX 770		33472 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 24272 (264%)

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 (in units of megabytes per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory speed. In the case of DDR RAM, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the max fill rate.