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Radeon HD 4850 2GB vs Radeon HD 7770

Intro

The Radeon HD 4850 2GB features a core clock speed of 625 MHz and a GDDR4 memory frequency of 993 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It features 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 7770, which features GPU clock speed of 1000 MHz, and 1024 MB of GDDR5 RAM set to run at 1125 MHz through a 128-bit bus. It also features 640 SPUs, 40 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
Radeon HD 4850 2GB 110 Watts
Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should be 13% faster than the Radeon HD 4850 2GB overall, because of its higher bandwidth. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 4850 2GB 63552 MB/sec
Difference: 8448 (13%)

Texel Rate

The Radeon HD 7770 will be quite a bit (approximately 60%) better at texture filtering than the Radeon HD 4850 2GB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 15000 (60%)

Pixel Rate

The Radeon HD 7770 should be quite a bit (approximately 60%) faster with regards to FSAA than the Radeon HD 4850 2GB, and also should be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 6000 (60%)

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 4850 2GB

Amazon.com

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Radeon HD 7770

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 4850 2GB Radeon HD 7770
Manufacturer AMD AMD
Year Jun 25, 2008 February 2012
Code Name RV770 PRO Cape Verde XT
Memory 2048 MB 1024 MB
Core Speed 625 MHz 1000 MHz
Memory Speed 1986 MHz 4500 MHz
Power (Max TDP) 110 watts 80 watts
Bandwidth 63552 MB/sec 72000 MB/sec
Texel Rate 25000 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 800(160x5) 640
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 28 nm
Transistors 956 million 1500 million
Bus PCIe 2.0 x16 PCIe 3.0 x16
DirectX Version DirectX 10.1 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

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

Display Prices

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Radeon HD 4850 2GB

Amazon.com

Check prices at:

Radeon HD 7770

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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