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Radeon HD 4850 X2 512MB vs Radeon HD 6770

Intro

The Radeon HD 4850 X2 512MB features core 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 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 6770, which makes use of a 40 nm design. AMD has set the core frequency at 900 MHz. The GDDR5 RAM is set to run at a speed of 1050 MHz on this card. It features 800 SPUs as well as 40 Texture Address Units and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6770 108 Watts
Radeon HD 4850 X2 512MB 250 Watts
Difference: 142 Watts (131%)

Memory Bandwidth

The Radeon HD 4850 X2 512MB should in theory be quite a bit faster than the Radeon HD 6770 in general. (explain)

Radeon HD 4850 X2 512MB 127104 MB/sec
Radeon HD 6770 67200 MB/sec
Difference: 59904 (89%)

Texel Rate

The Radeon HD 4850 X2 512MB will be quite a bit (about 39%) more effective at AF than the Radeon HD 6770. (explain)

Radeon HD 4850 X2 512MB 50000 Mtexels/sec
Radeon HD 6770 36000 Mtexels/sec
Difference: 14000 (39%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 4850 X2 512MB is a better choice, and very much so. (explain)

Radeon HD 4850 X2 512MB 20000 Mpixels/sec
Radeon HD 6770 14400 Mpixels/sec
Difference: 5600 (39%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6770

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 4850 X2 512MB Radeon HD 6770
Manufacturer AMD AMD
Year Nov 7, 2008 January 2011
Code Name R700 Juniper XT
Memory 512 MB (x2) 512 MB
Core Speed 625 MHz (x2) 900 MHz
Memory Speed 1986 MHz (x2) 4200 MHz
Power (Max TDP) 250 watts 108 watts
Bandwidth 127104 MB/sec 67200 MB/sec
Texel Rate 50000 Mtexels/sec 36000 Mtexels/sec
Pixel Rate 20000 Mpixels/sec 14400 Mpixels/sec
Unified Shaders 800(160x5) (x2) 800
Texture Mapping Units 40 (x2) 40
Render Output Units 16 (x2) 16
Bus Type GDDR3 GDDR5
Bus Width 256-bit (x2) 128-bit
Fab Process 55 nm 40 nm
Transistors 956 million 1040 million
Bus PCIe 2.0 x16 (PCIe bridge) PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the largest amount of data (counted in megabytes per second) that can be transferred across the external memory interface in one second. It's 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 once 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 amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 the graphics card could possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

Hide Prices

Radeon HD 4850 X2 512MB

Amazon.com

Check prices at:

Radeon HD 6770

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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