GeForce GTX 650 vs Radeon HD 6990

Intro

Compare all that to the Radeon HD 6990, which comes with core clock speeds of 830 MHz on the GPU, and 1250 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon HD 6990		5820 points
GeForce GTX 650		2263 points
	Difference: 3557 (157%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 6990		375 Watts
	Difference: 311 Watts (486%)

Memory Bandwidth

The Radeon HD 6990 should in theory be quite a bit faster than the GeForce GTX 650 in general. (explain)

Radeon HD 6990		320000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 240000 (300%)

Texel Rate

The Radeon HD 6990 should be much (about 371%) more effective at AF than the GeForce GTX 650. (explain)

Radeon HD 6990		159360 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 125504 (371%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 6990 is a better choice, by a large margin. (explain)

Radeon HD 6990		53120 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 36192 (214%)

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 information (in units of megabytes per second) that can be transferred over the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. In the case of DDR type memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated 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 rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.