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GeForce 8500 GT vs GeForce 9400 GT 256MB

Intro

The GeForce 8500 GT uses a 80 nm design. nVidia has set the core speed at 450 MHz. The DDR2 RAM runs at a frequency of 400 MHz on this specific model. It features 16 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Compare all that to the GeForce 9400 GT 256MB, which comes with a clock speed of 550 MHz and a GDDR2 memory frequency of 400 MHz. It also features a 128-bit memory bus, and makes use of a 65 nm design. It is comprised of 16 SPUs, 8 TAUs, and 4 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce 8500 GT 45 Watts
GeForce 9400 GT 256MB 50 Watts
Difference: 5 Watts (11%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so theoretically they should perform the same. (explain)

Texel Rate

The GeForce 9400 GT 256MB is quite a bit (about 22%) faster with regards to AF than the GeForce 8500 GT. (explain)

GeForce 9400 GT 256MB 4400 Mtexels/sec
GeForce 8500 GT 3600 Mtexels/sec
Difference: 800 (22%)

Pixel Rate

The GeForce 9400 GT 256MB will be much (about 22%) more effective at anti-aliasing than the GeForce 8500 GT, and also will be capable of handling higher screen resolutions better. (explain)

GeForce 9400 GT 256MB 2200 Mpixels/sec
GeForce 8500 GT 1800 Mpixels/sec
Difference: 400 (22%)

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 8500 GT

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

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 8500 GT GeForce 9400 GT 256MB
Manufacturer nVidia nVidia
Year April 2007 August 2008
Code Name G86 G96a
Memory 512 MB 256 MB
Core Speed 450 MHz 550 MHz
Memory Speed 800 MHz 800 MHz
Power (Max TDP) 45 watts 50 watts
Bandwidth 12800 MB/sec 12800 MB/sec
Texel Rate 3600 Mtexels/sec 4400 Mtexels/sec
Pixel Rate 1800 Mpixels/sec 2200 Mpixels/sec
Unified Shaders 16 16
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type DDR2 GDDR2
Bus Width 128-bit 128-bit
Fab Process 80 nm 65 nm
Transistors 210 million 314 million
Bus PCIe x16, PCI, PCIe x16 2.0 PCIe x16 2.0, PCI
DirectX Version DirectX 10 DirectX 10
OpenGL Version OpenGL 3.0 OpenGL 3.0

Memory Bandwidth: Bandwidth is the largest amount of information (counted in MB per second) that can be moved past the external memory interface within a second. It's calculated 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 it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels the graphics card can possibly record to the local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

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GeForce 8500 GT

Amazon.com

Check prices at:

GeForce 9400 GT 256MB

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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