Radeon HD 7770 vs Radeon HD 7870

Intro

Compare that to the Radeon HD 7870, which has a clock speed of 1000 MHz and a GDDR5 memory frequency of 1200 MHz. It also features a 256-bit bus, and makes use of a 28 nm design. It features 1280 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

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		6230 points
Radeon HD 7770		3180 points
	Difference: 3050 (96%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 7870		175 Watts
	Difference: 95 Watts (119%)

Memory Bandwidth

In theory, the Radeon HD 7870 should be 113% faster than the Radeon HD 7770 overall, due to its higher bandwidth. (explain)

Radeon HD 7870		153600 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 81600 (113%)

Texel Rate

The Radeon HD 7870 will be much (approximately 100%) better at texture filtering than the Radeon HD 7770. (explain)

Radeon HD 7870		80000 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 40000 (100%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7870 is superior to the Radeon HD 7770, by far. (explain)

Radeon HD 7870		32000 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 16000 (100%)

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 (measured in MB per second) that can be transferred across the external memory interface in a second. The number is worked out by multiplying the interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed in one 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 graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the maximum fill rate.