Radeon HD 7950 3GB vs Radeon HD 7990

Intro

Compare those specs to the Radeon HD 7990, which comes with a clock frequency of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also features a 384-bit bus, and makes use of a 28 nm design. It is comprised of 2048 SPUs, 128 Texture Address Units, and 32 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.

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon HD 7950 3GB		229 Sol/s
	Difference: 284 (124%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7950 3GB		200 Watts
Radeon HD 7990		375 Watts
	Difference: 175 Watts (88%)

Memory Bandwidth

In theory, the Radeon HD 7990 is 140% quicker than the Radeon HD 7950 3GB overall, due to its greater data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 7950 3GB		240000 MB/sec
	Difference: 336000 (140%)

Texel Rate

The Radeon HD 7990 will be much (about 171%) more effective at anisotropic filtering than the Radeon HD 7950 3GB. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 7950 3GB		89600 Mtexels/sec
	Difference: 153600 (171%)

Pixel Rate

The Radeon HD 7990 should be a lot (more or less 138%) better at FSAA than the Radeon HD 7950 3GB, and should be able to handle higher resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 7950 3GB		25600 Mpixels/sec
	Difference: 35200 (138%)

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 across the external memory interface within a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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