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GeForce 9400 GT 256MB vs Radeon HD 7790

Intro

The GeForce 9400 GT 256MB comes with core speeds of 550 MHz on the GPU, and 400 MHz on the 256 MB of GDDR2 RAM. It features 16 SPUs as well as 8 Texture Address Units and 4 ROPs.

Compare all that to the Radeon HD 7790, which has core clock speeds of 1000 MHz on the GPU, and 1500 MHz on the 1024 MB of GDDR5 RAM. It features 896 SPUs as well as 56 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 9400 GT 256MB 50 Watts
Radeon HD 7790 85 Watts
Difference: 35 Watts (70%)

Memory Bandwidth

The Radeon HD 7790 should in theory perform quite a bit faster than the GeForce 9400 GT 256MB overall. (explain)

Radeon HD 7790 96000 MB/sec
GeForce 9400 GT 256MB 12800 MB/sec
Difference: 83200 (650%)

Texel Rate

The Radeon HD 7790 should be much (approximately 1173%) faster with regards to texture filtering than the GeForce 9400 GT 256MB. (explain)

Radeon HD 7790 56000 Mtexels/sec
GeForce 9400 GT 256MB 4400 Mtexels/sec
Difference: 51600 (1173%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the Radeon HD 7790 is superior to the GeForce 9400 GT 256MB, by far. (explain)

Radeon HD 7790 16000 Mpixels/sec
GeForce 9400 GT 256MB 2200 Mpixels/sec
Difference: 13800 (627%)

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

Check prices at:

Radeon HD 7790

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 7790
Manufacturer nVidia AMD
Year August 2008 March 2013
Code Name G96a Bonaire XT
Memory 256 MB 1024 MB
Core Speed 550 MHz 1000 MHz
Memory Speed 800 MHz 6000 MHz
Power (Max TDP) 50 watts 85 watts
Bandwidth 12800 MB/sec 96000 MB/sec
Texel Rate 4400 Mtexels/sec 56000 Mtexels/sec
Pixel Rate 2200 Mpixels/sec 16000 Mpixels/sec
Unified Shaders 16 896
Texture Mapping Units 8 56
Render Output Units 4 16
Bus Type GDDR2 GDDR5
Bus Width 128-bit 128-bit
Fab Process 65 nm 28 nm
Transistors 314 million 2080 million
Bus PCIe x16 2.0, PCI PCIe 3.0 x16
DirectX Version DirectX 10 DirectX 11.1
OpenGL Version OpenGL 3.0 OpenGL 4.3

Memory Bandwidth: Memory bandwidth is the maximum amount of data (measured in megabytes per second) that can be moved across the external memory interface within a second. It is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the max fill rate.

Display Prices

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GeForce 9400 GT 256MB

Amazon.com

Check prices at:

Radeon HD 7790

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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