Geforce GTX 680 vs Radeon HD 4830 1GB

Intro

Compare that to the Radeon HD 4830 1GB, which has a core clock frequency of 575 MHz and a GDDR4 memory frequency of 900 MHz. It also makes use of a 256-bit bus, and makes use of a 55 nm design. It is comprised 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 680		195 Watts
	Difference: 100 Watts (105%)

Memory Bandwidth

In theory, the Geforce GTX 680 should be 234% quicker than the Radeon HD 4830 1GB in general, due to its greater bandwidth. (explain)

Geforce GTX 680		192256 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 134656 (234%)

Texel Rate

The Geforce GTX 680 is quite a bit (approximately 600%) faster with regards to AF than the Radeon HD 4830 1GB. (explain)

Geforce GTX 680		128768 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 110368 (600%)

Pixel Rate

The Geforce GTX 680 should be quite a bit (approximately 250%) faster with regards to full screen anti-aliasing than the Radeon HD 4830 1GB, and also should be capable of handling higher resolutions while still performing well. (explain)

Geforce GTX 680		32192 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 22992 (250%)

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 information (in units of megabytes per second) that can be moved past the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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