Radeon HD 7770 vs Radeon HD 7970

Intro

Compare all of that to the Radeon HD 7970, which has a GPU core clock speed of 925 MHz, and 3072 MB of GDDR5 RAM set to run at 1375 MHz through a 384-bit bus. It also is made up of 2048 SPUs, 128 TAUs, 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.

3DMark Fire Strike Graphics Score

Radeon HD 7970		8225 points
Radeon HD 7770		3180 points
	Difference: 5045 (159%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 7970		250 Watts
	Difference: 170 Watts (213%)

Memory Bandwidth

In theory, the Radeon HD 7970 will be 267% quicker than the Radeon HD 7770 overall, due to its greater data rate. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 192000 (267%)

Texel Rate

The Radeon HD 7970 should be quite a bit (more or less 196%) faster with regards to anisotropic filtering than the Radeon HD 7770. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 78400 (196%)

Pixel Rate

The Radeon HD 7970 should be quite a bit (more or less 85%) more effective at AA than the Radeon HD 7770, and should be able to handle higher resolutions better. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 13600 (85%)

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.

Price Comparison

Specifications

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in megabytes per second) that can be moved past the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. In the case of DDR memory, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better 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 are applied in one second. This number is calculated by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in one 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 - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.