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Radeon HD 7770 vs Radeon HD 7850


Intro

The Radeon HD 7770 has core clock speeds of 1000 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 640 SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Compare all of that to the Radeon HD 7850, which comes with clock speeds of 860 MHz on the GPU, and 1200 MHz on the 2048 MB of GDDR5 memory. It features 1024 SPUs as well as 64 TAUs and 32 ROPs.

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 7850 5200 points
Radeon HD 7770 3180 points
Difference: 2020 (64%)

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

As far as performance goes, the Radeon HD 7850 should theoretically be much better than the Radeon HD 7770 overall. (explain)

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

Texel Rate

The Radeon HD 7850 will be much (approximately 38%) more effective 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 a lot (more or less 72%) faster with regards to anti-aliasing than the Radeon HD 7770, and should be able to handle higher screen resolutions more effectively. (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

Radeon HD 7770

Radeon HD 7850

Specifications

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Model Radeon HD 7770 Radeon HD 7850
Manufacturer AMD AMD
Year February 2012 March 2012
Code Name Cape Verde XT Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 1000 MHz 860 MHz
Memory Speed 4500 MHz 4800 MHz
Power (Max TDP) 80 watts 130 watts
Bandwidth 72000 MB/sec 153600 MB/sec
Texel Rate 40000 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 640 1024
Texture Mapping Units 40 64
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 1500 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (measured in megabytes per second) that can be transported across the external memory interface in a second. It is calculated by multiplying the bus width by the speed of its memory. If it uses DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock speed of the chip. The higher this number, the better the 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 most pixels the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Radeon HD 7770

Radeon HD 7850

Comments

4 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.

James Adkins says:

i dont see why these older cards are about the same price as the r9 270x... i can get one of the 7850's from ebay for $90 as well lol

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