Radeon HD 7790 vs Radeon HD 7870 XT

Intro

Compare that to the Radeon HD 7870 XT, which uses a 28 nm design. AMD has set the core speed at 925 MHz. The GDDR5 memory is set to run at a speed of 1500 MHz on this specific card. It features 1536 SPUs along with 96 Texture Address Units and 32 ROPs.

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 XT		6390 points
Radeon HD 7790		4330 points
	Difference: 2060 (48%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 100 Watts (118%)

Memory Bandwidth

As far as performance goes, the Radeon HD 7870 XT should in theory be a lot superior to the Radeon HD 7790 overall. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 96000 (100%)

Texel Rate

The Radeon HD 7870 XT will be much (about 59%) faster with regards to anisotropic filtering than the Radeon HD 7790. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 32800 (59%)

Pixel Rate

The Radeon HD 7870 XT should be much (about 85%) faster with regards to FSAA than the Radeon HD 7790, and capable of handling higher screen resolutions more effectively. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 7790		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 maximum amount of data (counted in MB per second) that can be transferred across the external memory interface in one second. It's calculated by multiplying the interface width by its memory speed. If it uses DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most 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 calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.