Radeon HD 7770 vs Radeon R9 285

Intro

Compare those specs to the Radeon R9 285, which makes use of a 28 nm design. AMD has clocked the core speed at 918 MHz. The GDDR5 memory runs at a speed of 1375 MHz on this card. It features 1792 SPUs as well as 112 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 R9 285		8500 points
Radeon HD 7770		3180 points
	Difference: 5320 (167%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon R9 285		190 Watts
	Difference: 110 Watts (138%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 should be much faster than the Radeon HD 7770 in general. (explain)

Radeon R9 285		176000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 104000 (144%)

Texel Rate

The Radeon R9 285 will be much (approximately 157%) more effective at AF than the Radeon HD 7770. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 62816 (157%)

Pixel Rate

The Radeon R9 285 is quite a bit (more or less 84%) better at anti-aliasing than the Radeon HD 7770, and will be capable of handling higher resolutions without slowing down too much. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 13376 (84%)

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 across the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

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

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