GeForce 9800 GTX+ vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which comes with GPU core speed of 950 MHz, and 3072 MB of GDDR5 RAM set to run at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9800 GTX+		145 Watts
Radeon HD 7990		375 Watts
	Difference: 230 Watts (159%)

Memory Bandwidth

The Radeon HD 7990 should theoretically be quite a bit faster than the GeForce 9800 GTX+ overall. (explain)

Radeon HD 7990		576000 MB/sec
GeForce 9800 GTX+		70400 MB/sec
	Difference: 505600 (718%)

Texel Rate

The Radeon HD 7990 should be a lot (about 415%) faster with regards to texture filtering than the GeForce 9800 GTX+. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce 9800 GTX+		47232 Mtexels/sec
	Difference: 195968 (415%)

Pixel Rate

The Radeon HD 7990 should be a lot (approximately 415%) faster with regards to FSAA than the GeForce 9800 GTX+, and capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce 9800 GTX+		11808 Mpixels/sec
	Difference: 48992 (415%)

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 (measured in MB per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, it must 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 texture map elements (texels) that can be processed in one second. This is worked out by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. 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 output rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.