Radeon HD 7750 vs Radeon R9 285

Intro

Compare those specifications to the Radeon R9 285, which uses a 28 nm design. AMD has clocked the core frequency at 918 MHz. The GDDR5 RAM is set to run at a frequency of 1375 MHz on this specific 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 7750		2240 points
	Difference: 6260 (279%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon R9 285		190 Watts
	Difference: 135 Watts (245%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 285 should be 144% faster than the Radeon HD 7750 in general, because of its greater bandwidth. (explain)

Radeon R9 285		176000 MB/sec
Radeon HD 7750		72000 MB/sec
	Difference: 104000 (144%)

Texel Rate

The Radeon R9 285 will be quite a bit (more or less 302%) faster with regards to anisotropic filtering than the Radeon HD 7750. (explain)

Radeon R9 285		102816 Mtexels/sec
Radeon HD 7750		25600 Mtexels/sec
	Difference: 77216 (302%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R9 285 is the winner, by a large margin. (explain)

Radeon R9 285		29376 Mpixels/sec
Radeon HD 7750		12800 Mpixels/sec
	Difference: 16576 (130%)

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 max amount of data (in units of megabytes per second) that can be moved past the external memory interface in a 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 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 amount of texture map elements (texels) that can be applied in one second. This figure is calculated by multiplying the total amount of texture units of the card by the core speed of the chip. The higher 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 a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number of Raster Operations Pipelines 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 also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.