GeForce GT 450 (OEM) vs Radeon HD 6990

Intro

Compare all that to the Radeon HD 6990, which makes use of a 40 nm design. AMD has set the core speed at 830 MHz. The GDDR5 RAM is set to run at a speed of 1250 MHz on this particular model. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 450 (OEM)		106 Watts
Radeon HD 6990		375 Watts
	Difference: 269 Watts (254%)

Memory Bandwidth

As far as performance goes, the Radeon HD 6990 should in theory be much superior to the GeForce GT 450 (OEM) overall. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GT 450 (OEM)		96000 MB/sec
	Difference: 224000 (233%)

Texel Rate

The Radeon HD 6990 is quite a bit (approximately 741%) faster with regards to texture filtering than the GeForce GT 450 (OEM). (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GT 450 (OEM)		18960 Mtexels/sec
	Difference: 140400 (741%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6990 is a better choice, by far. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GT 450 (OEM)		18960 Mpixels/sec
	Difference: 34160 (180%)

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: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.