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GeForce 8400 GS 512MB vs Radeon HD 7750

Intro

The GeForce 8400 GS 512MB uses a 80 nm design. nVidia has clocked the core speed at 650 MHz. The DDR2 memory works at a speed of 400 MHz on this model. It features 16 SPUs as well as 8 Texture Address Units and 4 Rasterization Operator Units.

Compare those specs to the Radeon HD 7750, which comes with GPU clock speed of 800 MHz, and 1024 MB of GDDR5 memory running at 1125 MHz through a 128-bit bus. It also features 512 SPUs, 32 TAUs, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8400 GS 512MB 40 Watts
Radeon HD 7750 55 Watts
Difference: 15 Watts (38%)

Memory Bandwidth

In theory, the Radeon HD 7750 is 1025% quicker than the GeForce 8400 GS 512MB in general, due to its higher bandwidth. (explain)

Radeon HD 7750 72000 MB/sec
GeForce 8400 GS 512MB 6400 MB/sec
Difference: 65600 (1025%)

Texel Rate

The Radeon HD 7750 should be quite a bit (approximately 392%) more effective at anisotropic filtering than the GeForce 8400 GS 512MB. (explain)

Radeon HD 7750 25600 Mtexels/sec
GeForce 8400 GS 512MB 5200 Mtexels/sec
Difference: 20400 (392%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon HD 7750 is the winner, and very much so. (explain)

Radeon HD 7750 12800 Mpixels/sec
GeForce 8400 GS 512MB 2600 Mpixels/sec
Difference: 10200 (392%)

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 8400 GS 512MB

Amazon.com

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Radeon HD 7750

Amazon.com

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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 8400 GS 512MB Radeon HD 7750
Manufacturer nVidia AMD
Year June 2007 February 2012
Code Name G86 Cape Verde Pro
Memory 512 MB 1024 MB
Core Speed 650 MHz 800 MHz
Memory Speed 800 MHz 4500 MHz
Power (Max TDP) 40 watts 55 watts
Bandwidth 6400 MB/sec 72000 MB/sec
Texel Rate 5200 Mtexels/sec 25600 Mtexels/sec
Pixel Rate 2600 Mpixels/sec 12800 Mpixels/sec
Unified Shaders 16 512
Texture Mapping Units 8 32
Render Output Units 4 16
Bus Type DDR2 GDDR5
Bus Width 64-bit 128-bit
Fab Process 80 nm 28 nm
Transistors 210 million 1500 million
Bus PCIe x16, PCI PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It is worked out by multiplying the interface width by its memory speed. If it uses DDR RAM, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster 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 processed per second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The better this number, the better the video 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 the video card can possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is worked out 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 outputting the pixels (image) to the screen. The actual pixel rate also depends on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.

Display Prices

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GeForce 8400 GS 512MB

Amazon.com

Check prices at:

Radeon HD 7750

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

2 Responses to “GeForce 8400 GS 512MB vs Radeon HD 7750”
Will My System Support AMD/ATI HD 7750 1 GB GDDR5 Graphics Card? says:

[...] to the below site, my current 8400GS consumes 40w while 7750 hd consumes 55w ie.15w more. GeForce 8400 GS 512MB vs Radeon HD 7750 – Performance Comparison Benchmarks @ Hardware Compare According to Thermaltake Power Supply Calculator, my current rig with 8400gs consumes 327w. While [...]

nanogirl says:

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