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GeForce 9400 GT 256MB vs Radeon HD 6750 1GB

Intro

The GeForce 9400 GT 256MB comes with a GPU clock speed of 550 MHz, and the 256 MB of GDDR2 RAM is set to run at 400 MHz through a 128-bit bus. It also is made up of 16 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.

Compare all of that to the Radeon HD 6750 1GB, which features a clock frequency of 725 MHz and a GDDR5 memory frequency of 1000 MHz. It also features a 128-bit memory bus, and makes use of a 40 nm design. It is comprised of 720 SPUs, 36 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB 50 Watts
Radeon HD 6750 1GB 86 Watts
Difference: 36 Watts (72%)

Memory Bandwidth

Theoretically, the Radeon HD 6750 1GB should perform a lot faster than the GeForce 9400 GT 256MB in general. (explain)

Radeon HD 6750 1GB 64000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 51200 (400%)

Texel Rate

The Radeon HD 6750 1GB will be quite a bit (approximately 493%) more effective at anisotropic filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 6750 1GB 26100 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 21700 (493%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 6750 1GB is the winner, by a large margin. (explain)

Radeon HD 6750 1GB 11600 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 9400 (427%)

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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GeForce 9400 GT 256MB

Amazon.com

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Radeon HD 6750 1GB

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 GeForce 9400 GT 256MB Radeon HD 6750 1GB
Manufacturer nVidia AMD
Year August 2008 January 2011
Code Name G96a Juniper Pro
Memory 256 MB 1024 MB
Core Speed 550 MHz 725 MHz
Memory Speed 800 MHz 4000 MHz
Power (Max TDP) 50 watts 86 watts
Bandwidth 12800 MB/sec 64000 MB/sec
Texel Rate 4400 Mtexels/sec 26100 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 11600 Mpixels/sec
Unified Shaders 16 720
Texture Mapping Units 8 36
Render Output Units 4 16
Bus Type GDDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 65 nm 40 nm
Transistors 314 million 1040 million
Bus PCIe x16 2.0, PCI PCIe x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.0 OpenGL 4.1

Memory Bandwidth: Memory bandwidth is the maximum amount of information (counted in MB per second) that can be transported over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the 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 amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher this number, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Radeon HD 6750 1GB

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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