Radeon HD 7770 vs Radeon HD 7850

Intro

Compare all of that to the Radeon HD 7850, which comes with GPU core speed of 860 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also is made up of 1024 SPUs, 64 TAUs, 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 7770		3180 points
	Difference: 2020 (64%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 7850		130 Watts
	Difference: 50 Watts (63%)

Memory Bandwidth

In theory, the Radeon HD 7850 will be 113% quicker than the Radeon HD 7770 overall, because of its higher bandwidth. (explain)

Radeon HD 7850		153600 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon HD 7850 should be much (about 38%) better at AF than the Radeon HD 7770. (explain)

Radeon HD 7850		55040 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 15040 (38%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7850 is superior to the Radeon HD 7770, by far. (explain)

Radeon HD 7850		27520 Mpixels/sec
Radeon HD 7770		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: Bandwidth is the max amount of information (in units of MB per second) that can be transported over 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 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Render Output Units 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 fill rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.