Radeon HD 6990 vs Radeon HD 7750

Intro

Compare all that to the Radeon HD 7750, which comes with a core clock speed of 800 MHz and a GDDR5 memory speed of 1125 MHz. It also makes use of a 128-bit memory bus, and makes use of a 28 nm design. It features 512 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

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
Radeon HD 7750		2240 points
	Difference: 3580 (160%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 6990		375 Watts
	Difference: 320 Watts (582%)

Memory Bandwidth

The Radeon HD 6990, in theory, should perform quite a bit faster than the Radeon HD 7750 in general. (explain)

Radeon HD 6990		320000 MB/sec
Radeon HD 7750		72000 MB/sec
	Difference: 248000 (344%)

Texel Rate

The Radeon HD 6990 should be much (more or less 523%) better at texture filtering than the Radeon HD 7750. (explain)

Radeon HD 6990		159360 Mtexels/sec
Radeon HD 7750		25600 Mtexels/sec
	Difference: 133760 (523%)

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
Radeon HD 7750		12800 Mpixels/sec
	Difference: 40320 (315%)

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 maximum amount of information (counted in megabytes per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the 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 amount of texture map elements (texels) that are applied per second. This number is calculated by multiplying the total number of texture units by the core clock 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 per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.