Radeon HD 6750 1GB vs Radeon HD 7990

Intro

Compare that to the Radeon HD 7990, which features GPU core speed of 950 MHz, and 3072 MB of GDDR5 memory running at 1500 MHz through a 384-bit bus. It also features 2048 Stream Processors, 128 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 1GB		86 Watts
Radeon HD 7990		375 Watts
	Difference: 289 Watts (336%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be 800% quicker than the Radeon HD 6750 1GB overall, because of its higher data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 6750 1GB		64000 MB/sec
	Difference: 512000 (800%)

Texel Rate

The Radeon HD 7990 will be a lot (more or less 832%) more effective at AF than the Radeon HD 6750 1GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 6750 1GB		26100 Mtexels/sec
	Difference: 217100 (832%)

Pixel Rate

The Radeon HD 7990 is quite a bit (approximately 424%) better at anti-aliasing than the Radeon HD 6750 1GB, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 6750 1GB		11600 Mpixels/sec
	Difference: 49200 (424%)

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 information (in units of megabytes per second) that can be transported over the external memory interface in a second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 potential to reach the max fill rate.