GeForce 8300 GS (OEM) vs Radeon HD 6990

Intro

Compare that to the Radeon HD 6990, which comes with GPU clock speed of 830 MHz, and 2048 MB of GDDR5 RAM set to run at 1250 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 96 Texture Address Units, and 32 Raster Operation Units.

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

Theoretically speaking, the Radeon HD 6990 should be a lot faster than the GeForce 8300 GS (OEM) in general. (explain)

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

Texel Rate

The Radeon HD 6990 should be a lot (approximately 8753%) faster with regards to AF 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 a lot (about 5802%) faster with regards to FSAA than the GeForce 8300 GS (OEM), and also should be able to handle higher resolutions without losing too much performance. (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 largest amount of data (counted in MB per second) that can be transferred past the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.