Radeon HD 7770 vs Radeon HD 7870 XT

Intro

Compare all that to the Radeon HD 7870 XT, which has a GPU core clock speed of 925 MHz, and 2048 MB of GDDR5 RAM set to run at 1500 MHz through a 256-bit bus. It also is made up of 1536 Stream Processors, 96 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 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

The Radeon HD 7870 XT, in theory, should perform a lot faster than the Radeon HD 7770 overall. (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 quite a bit (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

If running with high levels of AA is important to you, then the Radeon HD 7870 XT is the winner, by far. (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 largest amount of data (counted in megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total texture units by the core clock speed of the chip. The higher this number, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.