GeForce 8300 GS (OEM) vs Radeon HD 6990

Intro

Compare those specifications to the Radeon HD 6990, which comes with a clock speed of 830 MHz and a GDDR5 memory speed of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 40 nm design. It features 1536 SPUs, 96 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8300 GS (OEM)		40 Watts
Radeon HD 6990		375 Watts
	Difference: 335 Watts (838%)

Memory Bandwidth

In theory, the Radeon HD 6990 should be a lot faster than the GeForce 8300 GS (OEM) overall. (explain)

Radeon HD 6990		320000 MB/sec
GeForce 8300 GS (OEM)		6400 MB/sec
	Difference: 313600 (4900%)

Texel Rate

The Radeon HD 6990 will be much (more or less 8753%) more effective at anisotropic filtering than the GeForce 8300 GS (OEM). (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce 8300 GS (OEM)		1800 Mtexels/sec
	Difference: 157560 (8753%)

Pixel Rate

The Radeon HD 6990 will be much (more or less 5802%) more effective at anti-aliasing than the GeForce 8300 GS (OEM), and should be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce 8300 GS (OEM)		900 Mpixels/sec
	Difference: 52220 (5802%)

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 (in units of megabytes per second) that can be transferred over the external memory interface within a second. It's calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the card will be at 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 could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on many 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.