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GeForce GT 420 vs GeForce GTX 285 1GB

Intro

The GeForce GT 420 has a GPU clock speed of 700 MHz, and the 2048 MB of GDDR3 RAM is set to run at 900 MHz through a 128-bit bus. It also is comprised of 48 Stream Processors, 8 Texture Address Units, and 4 Raster Operation Units.

Compare those specifications to the GeForce GTX 285 1GB, which comes with a core clock speed of 648 MHz and a GDDR3 memory speed of 1242 MHz. It also uses a 512-bit memory bus, and makes use of a 55 nm design. It is comprised of 240 SPUs, 80 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

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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 theoretically be much 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 will be much (approximately 826%) more effective 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 much (approximately 641%) better at anti-aliasing than the GeForce GT 420, and will be capable of handling 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 information (measured in megabytes per second) that can be transferred across the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a 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. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory 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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