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Radeon HD 4850 1GB vs Radeon HD 7770


Intro

The Radeon HD 4850 1GB comes with a GPU clock speed of 625 MHz, and the 1024 MB of GDDR4 RAM runs at 993 MHz through a 256-bit bus. It also is comprised of 800(160x5) SPUs, 40 TAUs, and 16 Raster Operation Units.

Compare those specifications to the Radeon HD 7770, which uses a 28 nm design. AMD has set the core speed at 1000 MHz. The GDDR5 RAM works at a frequency of 1125 MHz on this card. It features 640 SPUs as well as 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 1GB 110 Watts
Difference: 30 Watts (38%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 is 13% quicker than the Radeon HD 4850 1GB overall, due to its greater data rate. (explain)

Radeon HD 7770 72000 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 8448 (13%)

Texel Rate

The Radeon HD 7770 will be quite a bit (more or less 60%) faster with regards to anisotropic filtering than the Radeon HD 4850 1GB. (explain)

Radeon HD 7770 40000 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 15000 (60%)

Pixel Rate

The Radeon HD 7770 will be quite a bit (more or less 60%) better at FSAA than the Radeon HD 4850 1GB, and should be able to handle higher resolutions while still performing well. (explain)

Radeon HD 7770 16000 Mpixels/sec
Radeon HD 4850 1GB 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 1GB

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 4850 1GB Radeon HD 7770
Manufacturer AMD AMD
Year Jun 25, 2008 February 2012
Code Name RV770 PRO Cape Verde XT
Memory 1024 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: Bandwidth is the maximum amount of data (measured in megabytes per second) that can be transported over the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better 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 amount of texture map elements (texels) that can be applied per second. This is worked out by multiplying the total texture units by the core speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units 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 also depends on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 1GB

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

2 Responses to “Radeon HD 4850 1GB vs Radeon HD 7770”
xx says:

RADEON 4850HD WIN!

JS says:

Lol@at the 1st response.

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