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Radeon HD 7770 vs Radeon HD 7870 XT

Intro

The Radeon HD 7770 features clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specifications to the Radeon HD 7870 XT, which features a core clock frequency of 925 MHz and a GDDR5 memory frequency of 1500 MHz. It also makes use of a 256-bit bus, and uses a 28 nm design. It is comprised of 1536 SPUs, 96 Texture Address Units, and 32 Raster Operation Units.

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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 is 167% faster than the Radeon HD 7770 in general, because of its greater 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 will be a lot (more or less 122%) more effective at anisotropic 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 a lot (approximately 85%) better at AA than the Radeon HD 7770, and also should be capable of handling higher resolutions while still performing well. (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

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Radeon HD 7770

Amazon.com

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Radeon HD 7870 XT

Amazon.com

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Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 7770 Radeon HD 7870 XT
Manufacturer AMD AMD
Year February 2012 November 2012
Code Name Cape Verde XT Tahiti LE
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 925 MHz
Memory Speed 4500 MHz 6000 MHz
Power (Max TDP) 80 watts 185 watts
Bandwidth 72000 MB/sec 192000 MB/sec
Texel Rate 40000 Mtexels/sec 88800 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 29600 Mpixels/sec
Unified Shaders 640 1536
Texture Mapping Units 40 96
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 4313 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the max amount of data (measured in MB per second) that can be transported over the external memory interface in a second. It's worked out by multiplying the bus width by its memory speed. In the case of DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the number 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 rate is also dependant on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

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Radeon HD 7770

Amazon.com

Check prices at:

Radeon HD 7870 XT

Amazon.com

Check prices at:

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

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