Radeon HD 7770 vs Radeon HD 7870 XT

Intro

Compare all that to the Radeon HD 7870 XT, which comes with core clock speeds of 925 MHz on the GPU, and 1500 MHz on the 2048 MB of GDDR5 RAM. It features 1536 SPUs along with 96 Texture Address Units and 32 Rasterization Operator Units.

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 7870 XT		6390 points
Radeon HD 7770		3180 points
	Difference: 3210 (101%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770		80 Watts
Radeon HD 7870 XT		185 Watts
	Difference: 105 Watts (131%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7870 XT is 167% faster than the Radeon HD 7770 in general, due to its higher data rate. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 7770		72000 MB/sec
	Difference: 120000 (167%)

Texel Rate

The Radeon HD 7870 XT should be much (more or less 122%) faster with regards to texture filtering than the Radeon HD 7770. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 7770		40000 Mtexels/sec
	Difference: 48800 (122%)

Pixel Rate

The Radeon HD 7870 XT is much (about 85%) faster with regards to AA than the Radeon HD 7770, and will be capable of handling higher screen resolutions without slowing down too much. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 7770		16000 Mpixels/sec
	Difference: 13600 (85%)

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 (measured in megabytes per second) that can be transported over the external memory interface in one second. It's calculated by multiplying the card's interface width by its memory speed. If it uses DDR type memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends 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.