Geforce GTX 690 vs Radeon HD 4830 1GB

Intro

Compare those specs to the Radeon HD 4830 1GB, which features core 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

Theoretically speaking, the Geforce GTX 690 is 568% faster than the Radeon HD 4830 1GB overall, due to its greater data rate. (explain)

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

Texel Rate

The Geforce GTX 690 will be a lot (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

The Geforce GTX 690 should be much (approximately 537%) more effective at full screen anti-aliasing than the Radeon HD 4830 1GB, and should be able to handle higher resolutions while still performing well. (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 max amount of data (counted in megabytes per second) that can be transported across the external memory interface in one second. It's worked out by multiplying the card's interface width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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