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GeForce GT 420 vs Radeon HD 3650

Intro

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

Compare all that to the Radeon HD 3650, which features core speeds of 725 MHz on the GPU, and 800 MHz on the 1024 MB of GDDR4 RAM. It features 120(24x5) SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420 50 Watts
Radeon HD 3650 78 Watts
Difference: 28 Watts (56%)

Memory Bandwidth

Theoretically speaking, the GeForce GT 420 should perform a bit faster than the Radeon HD 3650 overall. (explain)

GeForce GT 420 28800 MB/sec
Radeon HD 3650 25600 MB/sec
Difference: 3200 (13%)

Texel Rate

The Radeon HD 3650 should be a little bit (about 4%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)

Radeon HD 3650 5800 Mtexels/sec
GeForce GT 420 5600 Mtexels/sec
Difference: 200 (4%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 3650 is superior to the GeForce GT 420, though not by far. (explain)

Radeon HD 3650 2900 Mpixels/sec
GeForce GT 420 2800 Mpixels/sec
Difference: 100 (4%)

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:

Radeon HD 3650

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 Radeon HD 3650
Manufacturer nVidia AMD
Year September 2010 2008
Code Name GF108 RV635 PRO
Memory 2048 MB 1024 MB
Core Speed 700 MHz 725 MHz
Memory Speed 1800 MHz 1600 MHz
Power (Max TDP) 50 watts 78 watts
Bandwidth 28800 MB/sec 25600 MB/sec
Texel Rate 5600 Mtexels/sec 5800 Mtexels/sec
Pixel Rate 2800 Mpixels/sec 2900 Mpixels/sec
Unified Shaders 48 120(24x5)
Texture Mapping Units 8 8
Render Output Units 4 4
Bus Type GDDR3 GDDR4
Bus Width 128-bit 128-bit
Fab Process 40 nm 55 nm
Transistors 585 million (Unknown) million
Bus PCIe x16 PCIe 2.0 x16/AGP 8x
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Memory bandwidth is the largest amount of information (measured in MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, 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 texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better this number, the better the card will be at 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 the local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

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GeForce GT 420

Amazon.com

Check prices at:

Radeon HD 3650

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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