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Radeon HD 3870 1GB vs Radeon HD 6750

Intro

The Radeon HD 3870 1GB has a GPU clock speed of 775 MHz, and the 1024 MB of GDDR4 RAM is set to run at 1125 MHz through a 256-bit bus. It also features 320(64x5) Stream Processors, 16 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 6750, which comes with core speeds of 725 MHz on the GPU, and 1000 MHz on the 512 MB of GDDR5 RAM. It features 720 SPUs along with 36 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6750 86 Watts
Radeon HD 3870 1GB 106 Watts
Difference: 20 Watts (23%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 3870 1GB should perform a small bit faster than the Radeon HD 6750 overall. (explain)

Radeon HD 3870 1GB 72000 MB/sec
Radeon HD 6750 64000 MB/sec
Difference: 8000 (13%)

Texel Rate

The Radeon HD 6750 is quite a bit (approximately 110%) better at anisotropic filtering than the Radeon HD 3870 1GB. (explain)

Radeon HD 6750 26100 Mtexels/sec
Radeon HD 3870 1GB 12400 Mtexels/sec
Difference: 13700 (110%)

Pixel Rate

The Radeon HD 3870 1GB should be a bit (about 7%) more effective at full screen anti-aliasing than the Radeon HD 6750, and also should be capable of handling higher resolutions without slowing down too much. (explain)

Radeon HD 3870 1GB 12400 Mpixels/sec
Radeon HD 6750 11600 Mpixels/sec
Difference: 800 (7%)

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 3870 1GB

Amazon.com

Check prices at:

Radeon HD 6750

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 3870 1GB Radeon HD 6750
Manufacturer AMD AMD
Year Nov 19, 2007 January 2011
Code Name RV670 XT Juniper Pro
Memory 1024 MB 512 MB
Core Speed 775 MHz 725 MHz
Memory Speed 2250 MHz 4000 MHz
Power (Max TDP) 106 watts 86 watts
Bandwidth 72000 MB/sec 64000 MB/sec
Texel Rate 12400 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 12400 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 320(64x5) 720
Texture Mapping Units 16 36
Render Output Units 16 16
Bus Type GDDR4 GDDR5
Bus Width 256-bit 128-bit
Fab Process 55 nm 40 nm
Transistors (Unknown) million 1040 million
Bus PCIe 2.0 x16/AGP 8x PCIe x16
DirectX Version DirectX 10.1 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.0

Memory Bandwidth: Bandwidth is the max amount of data (in units of megabytes per second) that can be transported across the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This number is calculated by multiplying the total texture units by the core clock speed of the chip. The higher 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 number of pixels that the graphics chip could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

Radeon HD 3870 1GB

Amazon.com

Check prices at:

Radeon HD 6750

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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