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Radeon HD 4770 vs Radeon HD 4850 512MB

Intro

The Radeon HD 4770 comes with core clock speeds of 750 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 4850 512MB, which has clock speeds of 625 MHz on the GPU, and 993 MHz on the 512 MB of GDDR3 RAM. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
Radeon HD 4850 512MB 110 Watts
Difference: 30 Watts (38%)

Memory Bandwidth

Performance-wise, the Radeon HD 4850 512MB should in theory be quite a bit superior to the Radeon HD 4770 overall. (explain)

Radeon HD 4850 512MB 63552 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 12352 (24%)

Texel Rate

The Radeon HD 4850 512MB will be a little bit (approximately 4%) more effective at anisotropic filtering than the Radeon HD 4770. (explain)

Radeon HD 4850 512MB 25000 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 1000 (4%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4770 is a better choice, but not by far. (explain)

Radeon HD 4770 12000 Mpixels/sec
Radeon HD 4850 512MB 10000 Mpixels/sec
Difference: 2000 (20%)

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 4770

Amazon.com

Check prices at:

Radeon HD 4850 512MB

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.

Specifications

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Model Radeon HD 4770 Radeon HD 4850 512MB
Manufacturer AMD AMD
Year Apr 28, 2009 Jun 25, 2008
Code Name RV740 RV770 PRO
Memory 512 MB 512 MB
Core Speed 750 MHz 625 MHz
Memory Speed 3200 MHz 1986 MHz
Power (Max TDP) 80 watts 110 watts
Bandwidth 51200 MB/sec 63552 MB/sec
Texel Rate 24000 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 12000 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 640(128x5) 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 826 million 956 million
Bus PCIe 2.0 x16 PCIe 2.0 x16
DirectX Version DirectX 10.1 DirectX 10.1
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the max amount of data (in units of MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the video card will be at 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 video card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 4770

Amazon.com

Check prices at:

Radeon HD 4850 512MB

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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