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Radeon HD 4890 1GB vs Radeon HD 6850

Intro

The Radeon HD 4890 1GB has a core clock speed of 1000 MHz and a GDDR5 memory speed of 975 MHz. It also makes use of a 256-bit bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 Raster Operation Units.

Compare those specs to the Radeon HD 6850, which uses a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM is set to run at a speed of 1000 MHz on this particular card. It features 960 SPUs as well as 48 Texture Address Units and 32 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6850 127 Watts
Radeon HD 4890 1GB 190 Watts
Difference: 63 Watts (50%)

Memory Bandwidth

The Radeon HD 6850 should theoretically be a small bit faster than the Radeon HD 4890 1GB overall. (explain)

Radeon HD 6850 128000 MB/sec
Radeon HD 4890 1GB 124800 MB/sec
Difference: 3200 (3%)

Texel Rate

The Radeon HD 4890 1GB should be just a bit (about 8%) more effective at texture filtering than the Radeon HD 6850. (explain)

Radeon HD 4890 1GB 40000 Mtexels/sec
Radeon HD 6850 37200 Mtexels/sec
Difference: 2800 (8%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 6850 is a better choice, by a large margin. (explain)

Radeon HD 6850 24800 Mpixels/sec
Radeon HD 4890 1GB 16000 Mpixels/sec
Difference: 8800 (55%)

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 4890 1GB

Amazon.com

Check prices at:

Radeon HD 6850

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 4890 1GB Radeon HD 6850
Manufacturer AMD AMD
Year Apr 2, 2009 October 2010
Code Name RV790 XT Barts Pro
Memory 1024 MB 1024 MB
Core Speed 1000 MHz 775 MHz
Memory Speed 3900 MHz 4000 MHz
Power (Max TDP) 190 watts 127 watts
Bandwidth 124800 MB/sec 128000 MB/sec
Texel Rate 40000 Mtexels/sec 37200 Mtexels/sec
Pixel Rate 16000 Mpixels/sec 24800 Mpixels/sec
Unified Shaders 800(160x5) 960
Texture Mapping Units 40 48
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 55 nm 40 nm
Transistors 959 million 1700 million
Bus PCIe 2.0 x16 PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be moved across the external memory interface in one second. It's calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the max fill rate.

Display Prices

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Radeon HD 4890 1GB

Amazon.com

Check prices at:

Radeon HD 6850

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 4890 1GB vs Radeon HD 6850”
4890 CF vs 6870 vs Waiting for a 69XX - Page 2 - Overclock.net - Overclocking.net says:

[...] http://www.hwcompare.com/5931/radeon...adeon-hd-6850/ __________________ ..:Q6600 Club:.. [...]

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