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GeForce GT 420 vs GeForce GTX 285 1GB

Intro

The GeForce GT 420 features a clock speed of 700 MHz and a GDDR3 memory frequency of 900 MHz. It also makes use of a 128-bit bus, and makes use of a 40 nm design. It is comprised of 48 SPUs, 8 Texture Address Units, and 4 ROPs.

Compare that to the GeForce GTX 285 1GB, which features clock speeds of 648 MHz on the GPU, and 1242 MHz on the 1024 MB of GDDR3 memory. It features 240 SPUs along with 80 Texture Address Units and 32 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
GeForce GTX 285 1GB 204 Watts
Difference: 154 Watts (308%)

Memory Bandwidth

Performance-wise, the GeForce GTX 285 1GB should in theory be quite a bit superior to the GeForce GT 420 overall. (explain)

GeForce GTX 285 1GB 158976 MB/sec
GeForce GT 420 28800 MB/sec
Difference: 130176 (452%)

Texel Rate

The GeForce GTX 285 1GB is a lot (approximately 826%) better at AF than the GeForce GT 420. (explain)

GeForce GTX 285 1GB 51840 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 46240 (826%)

Pixel Rate

The GeForce GTX 285 1GB will be quite a bit (more or less 641%) better at AA than the GeForce GT 420, and also should be able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 285 1GB 20736 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 17936 (641%)

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 GT 420

Amazon.com

Check prices at:

GeForce GTX 285 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 GT 420 GeForce GTX 285 1GB
Manufacturer nVidia nVidia
Year September 2010 January 15, 2009
Code Name GF108 G200b
Memory 2048 MB 1024 MB
Core Speed 700 MHz 648 MHz
Memory Speed 1800 MHz 2484 MHz
Power (Max TDP) 50 watts 204 watts
Bandwidth 28800 MB/sec 158976 MB/sec
Texel Rate 5600 Mtexels/sec 51840 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 20736 Mpixels/sec
Unified Shaders 48 240
Texture Mapping Units 8 80
Render Output Units 4 32
Bus Type GDDR3 GDDR3
Bus Width 128-bit 512-bit
Fab Process 40 nm 55 nm
Transistors 585 million 1400 million
Bus PCIe x16 PCIe x16 2.0
DirectX Version DirectX 11 DirectX 10
OpenGL Version OpenGL 4.1 OpenGL 3.1

Memory Bandwidth: Bandwidth is the max amount of data (counted in megabytes per second) that can be transferred over the external memory interface within a second. The number is calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core 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 fill rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GT 420

Amazon.com

Check prices at:

GeForce GTX 285 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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