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Radeon HD 6870 vs Radeon HD 7770


Intro

The Radeon HD 6870 makes use of a 40 nm design. AMD has clocked the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this specific card. It features 1120 SPUs as well as 56 Texture Address Units and 32 ROPs.

Compare those specifications to the Radeon HD 7770, which has a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 ROPs.

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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 7770 3180 points
Radeon HD 6870 2870 points
Difference: 310 (11%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 6870 151 Watts
Difference: 71 Watts (89%)

Memory Bandwidth

Performance-wise, the Radeon HD 6870 should in theory be quite a bit superior to the Radeon HD 7770 overall. (explain)

Radeon HD 6870 134400 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 62400 (87%)

Texel Rate

The Radeon HD 6870 should be quite a bit (about 26%) faster with regards to anisotropic filtering than the Radeon HD 7770. (explain)

Radeon HD 6870 50400 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 10400 (26%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 6870 is a better choice, by a large margin. (explain)

Radeon HD 6870 28800 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 12800 (80%)

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 6870

Amazon.com

Radeon HD 7770

Amazon.com

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 6870 Radeon HD 7770
Manufacturer AMD AMD
Year October 2010 February 2012
Code Name Barts XT Cape Verde XT
Memory 1024 MB 1024 MB
Core Speed 900 MHz 1000 MHz
Memory Speed 4200 MHz 4500 MHz
Power (Max TDP) 151 watts 80 watts
Bandwidth 134400 MB/sec 72000 MB/sec
Texel Rate 50400 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 28800 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 1120 640
Texture Mapping Units 56 40
Render Output Units 32 16
Bus Type GDDR5 GDDR5
Bus Width 256-bit 128-bit
Fab Process 40 nm 28 nm
Transistors 1700 million 1500 million
Bus PCIe x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in megabytes per second) that can be transferred across the external memory interface in a second. The number is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen 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 texture units by the core clock speed of the chip. The better this number, the better the 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 graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the amount of Render Output Units by the clock 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 rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 6870

Amazon.com

Radeon HD 7770

Amazon.com

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.

Comments

3 Responses to “Radeon HD 6870 vs Radeon HD 7770”
james says:

Are you using pice 2 or pcie 3

?????????????????

Aaron says:

It would have to be PCI-e 2.0 or 2.1 because the 6970 doesn't support PCI-e 3.0, and the theoretical benchmarks are not dependent on PCI-e speed. Anyway, you should get the 6870 instead of the 7770, the 68xx series has the BEST price to performance ratio of ANY AMD/ATI radeon HD graphics card.

[DOMANDA] Quale produttore per 550ti (versioni oc) - Pagina 2 says:

[...] HD 6870 will be a lot (approximately 26%) faster with regards to AF than the Radeon HD 7770. (explain)Radeon HD 6870 50400 Mtexels/sec Radeon HD 7770 40000 Mtexels/sec Difference: 10400 (26%) [...]

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