Radeon HD 7770 vs Radeon HD 7870 XT

Intro

Compare those specifications to the Radeon HD 7870 XT, which features 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

In theory, the Radeon HD 7870 XT should be 167% faster than the Radeon HD 7770 overall, due to its greater bandwidth. (explain)

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

Texel Rate

The Radeon HD 7870 XT is quite a bit (approximately 122%) more effective at AF 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 will be a lot (about 85%) faster with regards to AA than the Radeon HD 7770, and will be capable of handling higher resolutions without losing too much performance. (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: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This figure is calculated by multiplying the total amount of texture units by the core speed of the chip. The better the texel rate, the better the 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 maximum amount of pixels the video card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Raster Operations Pipelines by the clock 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 is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.