Radeon HD 7790 vs Radeon HD 7850

Intro

Compare those specifications to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core frequency at 860 MHz. The GDDR5 RAM is set to run at a speed of 1200 MHz on this card. It features 1024 SPUs as well as 64 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 7850		5200 points
Radeon HD 7790		4330 points
	Difference: 870 (20%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 7850		130 Watts
	Difference: 45 Watts (53%)

Memory Bandwidth

The Radeon HD 7850, in theory, should perform quite a bit faster than the Radeon HD 7790 in general. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 57600 (60%)

Texel Rate

The Radeon HD 7790 should be just a bit (more or less 2%) better at anisotropic filtering than the Radeon HD 7850. (explain)

Radeon HD 7790		56000 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 960 (2%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 7850 is the winner, by a large margin. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 11520 (72%)

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 (counted in MB per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the bus width by its memory speed. If it uses DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.