Geforce GTX 690 vs Radeon HD 4850 2GB

Intro

Compare all of that to the Radeon HD 4850 2GB, which features a clock frequency of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit bus, and uses a 55 nm design. It is comprised of 800(160x5) SPUs, 40 TAUs, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4850 2GB		110 Watts
Geforce GTX 690		300 Watts
	Difference: 190 Watts (173%)

Memory Bandwidth

The Geforce GTX 690 should in theory be quite a bit faster than the Radeon HD 4850 2GB in general. (explain)

Geforce GTX 690		384512 MB/sec
Radeon HD 4850 2GB		63552 MB/sec
	Difference: 320960 (505%)

Texel Rate

The Geforce GTX 690 should be a lot (about 837%) better at anisotropic filtering than the Radeon HD 4850 2GB. (explain)

Geforce GTX 690		234240 Mtexels/sec
Radeon HD 4850 2GB		25000 Mtexels/sec
	Difference: 209240 (837%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Geforce GTX 690 is the winner, by a large margin. (explain)

Geforce GTX 690		58560 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 48560 (486%)

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 transferred over the external memory interface in a second. It's worked out by multiplying the interface width by the speed of its memory. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This number is calculated by multiplying the total number of texture units of the card by the core 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 in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the clock speed of the card. 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 is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.