Geforce GTX 690 vs Radeon HD 4830 1GB

Intro

Compare all of that to the Radeon HD 4830 1GB, which features core clock speeds of 575 MHz on the GPU, and 900 MHz on the 1024 MB of GDDR4 memory. It features 640(128x5) SPUs along with 32 TAUs 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 690		300 Watts
	Difference: 205 Watts (216%)

Memory Bandwidth

As far as performance goes, the Geforce GTX 690 should theoretically be quite a bit better than the Radeon HD 4830 1GB overall. (explain)

Geforce GTX 690		384512 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 326912 (568%)

Texel Rate

The Geforce GTX 690 should be quite a bit (approximately 1173%) better at AF than the Radeon HD 4830 1GB. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 215840 (1173%)

Pixel Rate

If using a high screen resolution is important to you, then the Geforce GTX 690 is the winner, and very much so. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon HD 4830 1GB		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: Memory bandwidth is the largest amount of data (in units of MB per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics 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 that the graphics chip could possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.