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Radeon HD 4850 1GB vs Radeon HD 5770

Intro

The Radeon HD 4850 1GB features a core clock speed of 625 MHz and a GDDR4 memory speed of 993 MHz. It also features a 256-bit bus, and makes use of a 55 nm design. It is comprised of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 5770, which uses a 40 nm design. AMD has set the core frequency at 850 MHz. The GDDR5 memory is set to run at a speed of 1200 MHz on this particular card. It features 800(160x5) SPUs along with 40 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5770 108 Watts
Radeon HD 4850 1GB 110 Watts
Difference: 2 Watts (2%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 5770 should be 21% faster than the Radeon HD 4850 1GB overall, because of its greater bandwidth. (explain)

Radeon HD 5770 76800 MB/sec
Radeon HD 4850 1GB 63552 MB/sec
Difference: 13248 (21%)

Texel Rate

The Radeon HD 5770 is a lot (more or less 36%) more effective at texture filtering than the Radeon HD 4850 1GB. (explain)

Radeon HD 5770 34000 Mtexels/sec
Radeon HD 4850 1GB 25000 Mtexels/sec
Difference: 9000 (36%)

Pixel Rate

The Radeon HD 5770 will be a lot (about 36%) faster with regards to FSAA than the Radeon HD 4850 1GB, and also will be able to handle higher resolutions better. (explain)

Radeon HD 5770 13600 Mpixels/sec
Radeon HD 4850 1GB 10000 Mpixels/sec
Difference: 3600 (36%)

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

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Radeon HD 5770

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 1GB Radeon HD 5770
Manufacturer AMD AMD
Year Jun 25, 2008 October 13, 2009
Code Name RV770 PRO Juniper XT
Memory 1024 MB 1024 MB
Core Speed 625 MHz 850 MHz
Memory Speed 1986 MHz 4800 MHz
Power (Max TDP) 110 watts 108 watts
Bandwidth 63552 MB/sec 76800 MB/sec
Texel Rate 25000 Mtexels/sec 34000 Mtexels/sec
Pixel Rate 10000 Mpixels/sec 13600 Mpixels/sec
Unified Shaders 800(160x5) 800(160x5)
Texture Mapping Units 40 40
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 PCIe 2.1 x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics 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 ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as 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 - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

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Radeon HD 4850 1GB

Amazon.com

Check prices at:

Radeon HD 5770

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.

Comments

One Response to “Radeon HD 4850 1GB vs Radeon HD 5770”
Anonymous says:

[...] excelente para ver el rendimiento y consumo. Insisto, la 5770 es la mejor en consumo/rendimiento, Radeon HD 4850 1GB vs Radeon HD 5770 – Performance Comparison Benchmarks @ Hardware Compare Cuantos watts reales gasta tu tarjeta? Report: the true power consumption of 73 graphics cards [...]

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