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Radeon HD 4890 1GB vs Radeon HD 6850

Intro

The Radeon HD 4890 1GB uses a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 975 MHz on this particular model. It features 800(160x5) SPUs along with 40 TAUs and 16 ROPs.

Compare that to the Radeon HD 6850, which features core speeds of 775 MHz on the GPU, and 1000 MHz on the 1024 MB of GDDR5 RAM. It features 960 SPUs as well as 48 Texture Address Units and 32 Rasterization Operator Units.

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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 perform a little bit faster than the Radeon HD 4890 1GB in general. (explain)

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

Texel Rate

The Radeon HD 4890 1GB is a bit (about 8%) better 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

The Radeon HD 6850 should be much (approximately 55%) more effective at full screen anti-aliasing than the Radeon HD 4890 1GB, and able to handle higher screen resolutions without losing too much performance. (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: Memory bandwidth is the maximum amount of data (in units of MB per second) that can be moved across the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory speed. If it uses DDR memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels 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 core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

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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