Geforce GTX 690 vs Radeon HD 4830 512MB

Intro

Compare all that to the Radeon HD 4830 512MB, which uses a 55 nm design. AMD has clocked the core speed at 575 MHz. The GDDR3 memory runs at a speed of 900 MHz on this specific model. It features 640(128x5) SPUs along with 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4830 512MB		95 Watts
Geforce GTX 690		300 Watts
	Difference: 205 Watts (216%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 690 should in theory be a lot better than the Radeon HD 4830 512MB in general. (explain)

Geforce GTX 690		384512 MB/sec
Radeon HD 4830 512MB		57600 MB/sec
	Difference: 326912 (568%)

Texel Rate

The Geforce GTX 690 will be a lot (about 1173%) better at texture filtering than the Radeon HD 4830 512MB. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon HD 4830 512MB		18400 Mtexels/sec
	Difference: 215840 (1173%)

Pixel Rate

The Geforce GTX 690 will be much (approximately 537%) better at anti-aliasing than the Radeon HD 4830 512MB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon HD 4830 512MB		9200 Mpixels/sec
	Difference: 49360 (537%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be moved over the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. In the case of DDR type memory, the result should be multiplied by 2 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 AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics 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 core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.