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Radeon HD 4770 vs Radeon HD 4850 512MB

Intro

The Radeon HD 4770 has a clock frequency of 750 MHz and a GDDR5 memory frequency of 800 MHz. It also uses a 128-bit bus, and makes use of a 40 nm design. It is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 4850 512MB, which features GPU clock speed of 625 MHz, and 512 MB of GDDR3 memory set to run at 993 MHz through a 256-bit bus. It also features 800(160x5) SPUs, 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

In theory, the Radeon HD 4850 512MB will be 24% quicker than the Radeon HD 4770 in general, due to its higher bandwidth. (explain)

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

Texel Rate

The Radeon HD 4850 512MB should be a small bit (about 4%) better 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

The Radeon HD 4770 will be a small bit (more or less 20%) faster with regards to full screen anti-aliasing than the Radeon HD 4850 512MB, and capable of handling higher screen resolutions without losing too much performance. (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

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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 largest amount of information (in units of MB per second) that can be transported past the external memory interface within a second. The number is calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

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

Display Prices

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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.

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