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Radeon HD 7770 vs Radeon HD 7850

Intro

The Radeon HD 7770 makes use of a 28 nm design. ATi has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 1125 MHz on this specific card. It features 640 SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

Compare those specs to the Radeon HD 7850, which has a GPU core clock speed of 860 MHz, and 2048 MB of GDDR5 memory set to run at 1200 MHz through a 256-bit bus. It also features 1024 SPUs, 64 TAUs, and 32 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 7850 130 Watts
Difference: 50 Watts (63%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7850 should be a lot faster than the Radeon HD 7770 in general. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 7770 72000 MB/sec
Difference: 81600 (113%)

Texel Rate

The Radeon HD 7850 should be much (more or less 38%) better at AF than the Radeon HD 7770. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 7770 40000 Mtexels/sec
Difference: 15040 (38%)

Pixel Rate

The Radeon HD 7850 should be much (more or less 72%) better at anti-aliasing than the Radeon HD 7770, and also capable of handling higher resolutions better. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 7770 16000 Mpixels/sec
Difference: 11520 (72%)

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

Please note that the price comparisons are based on search keywords, and might not be the exact same card listed on this page. We have no control over the accuracy of their search results.

Radeon HD 7770

Amazon.com

Other US-based stores

Radeon HD 7850

Amazon.com

Other US-based stores

Specifications

Model Radeon HD 7770 Radeon HD 7850
Manufacturer ATi ATi
Year February 2012 March 2012
Code Name Cape Verde XT Pitcairn Pro
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 860 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1125 MHz (4500 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 640 1024
Texture Mapping Units 40 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 80 watts 130 watts
Shader Model 5.0 5.0
Bandwidth 72000 MB/sec 153600 MB/sec
Texel Rate 40000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 27520 Mpixels/sec

Memory Bandwidth: Memory bandwidth is the max amount of data (counted in megabytes per second) that can be moved across the external memory interface in a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

3 Responses to “Radeon HD 7770 vs Radeon HD 7850”
PS4 vs Xbox One (?) says:
Similar, but not exact.
add says:
Add ASUS 7770 2GB!
Otherwise this makes bad comparison
Min Nguyen says:
I agree ASUS Radeon HD 7770 2GD5 needs to be added.

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