Radeon HD 7790 vs Radeon HD 7870

Intro

Compare those specs to the Radeon HD 7870, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this particular card. It features 1280 SPUs as well as 80 TAUs and 32 Rasterization Operator 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 7870		6230 points
Radeon HD 7790		4330 points
	Difference: 1900 (44%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 7870		175 Watts
	Difference: 90 Watts (106%)

Memory Bandwidth

Theoretically, the Radeon HD 7870 should perform much faster than the Radeon HD 7790 in general. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 57600 (60%)

Texel Rate

The Radeon HD 7870 should be a lot (about 43%) faster with regards to anisotropic filtering than the Radeon HD 7790. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 24000 (43%)

Pixel Rate

The Radeon HD 7870 is much (more or less 100%) more effective at anti-aliasing than the Radeon HD 7790, and also should be able to handle higher resolutions better. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 16000 (100%)

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: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the bus width by the speed of its memory. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to 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 get to the max fill rate.