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GeForce GT 420 vs Radeon HD 6450 (OEM) 1GB
Intro
The GeForce GT 420 features a core clock speed of 700 MHz and a GDDR3 memory speed of 900 MHz. It also uses a 128-bit bus, and uses a 40 nm design. It is comprised of 48 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.Compare those specifications to the Radeon HD 6450 (OEM) 1GB, which has a core clock speed of 750 MHz and a GDDR5 memory frequency of 900 MHz. It also uses a 64-bit bus, and makes use of a 40 nm design. It features 160 SPUs, 8 Texture Address Units, and 4 Raster Operation Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6450 (OEM) 1GB |
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31 Watts |
| GeForce GT 420 |
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50 Watts |
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Memory Bandwidth
Both cards have the exact same memory bandwidth, so in theory they should perform the same. (explain)
Texel Rate
The Radeon HD 6450 (OEM) 1GB will be a little bit (about 7%) more effective at texture filtering than the GeForce GT 420. (explain)| Radeon HD 6450 (OEM) 1GB |
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6000 Mtexels/sec |
| GeForce GT 420 |
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5600 Mtexels/sec |
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Pixel Rate
If using a high screen resolution is important to you, then the Radeon HD 6450 (OEM) 1GB is a better choice, not by a very large margin though. (explain)| Radeon HD 6450 (OEM) 1GB |
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3000 Mpixels/sec |
| GeForce GT 420 |
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2800 Mpixels/sec |
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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
GeForce GT 420Amazon.com
Check prices at:
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Radeon HD 6450 (OEM) 1GBAmazon.com
Check prices at:
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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
| Model | GeForce GT 420 | Radeon HD 6450 (OEM) 1GB |
|---|---|---|
| Manufacturer | nVidia | AMD |
| Year | September 2010 | February 2011 |
| Code Name | GF108 | Caicos |
| Memory | 2048 MB | 1024 MB |
| Core Speed | 700 MHz | 750 MHz |
| Memory Speed | 1800 MHz | 3600 MHz |
| Power (Max TDP) | 50 watts | 31 watts |
| Bandwidth | 28800 MB/sec | 28800 MB/sec |
| Texel Rate | 5600 Mtexels/sec | 6000 Mtexels/sec |
| Pixel Rate | 2800 Mpixels/sec | 3000 Mpixels/sec |
| Unified Shaders | 48 | 160 |
| Texture Mapping Units | 8 | 8 |
| Render Output Units | 4 | 4 |
| Bus Type | GDDR3 | GDDR5 |
| Bus Width | 128-bit | 64-bit |
| Fab Process | 40 nm | 40 nm |
| Transistors | 585 million | 370 million |
| Bus | PCIe x16 | PCIe 2.1 x16 |
| DirectX Version | DirectX 11 | DirectX 11 |
| OpenGL Version | OpenGL 4.1 | OpenGL 4.1 |
Memory Bandwidth: Bandwidth is the maximum amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory clock speed. If the card has DDR type RAM, it should be multiplied by 2 once again. If it uses 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, High Dynamic Range and higher screen resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied per second. This figure is worked out by multiplying the total amount of texture units by the core clock speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.
Pixel Rate: Pixel rate is the maximum number of pixels the video card could possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.
GeForce GT 420Amazon.com
Check prices at:
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Radeon HD 6450 (OEM) 1GBAmazon.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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Comments
2 Responses to “GeForce GT 420 vs Radeon HD 6450 (OEM) 1GB”What does these figures mean when it comes to practical usage? I wish to buy a computer on which I can watch a full screen HD video, 1920×1080, via the HDMI on my new flat screen tv. Is it enough with a graphics card like GeForce GT 420 for this purpose?
This is obviously not a comment, but I would be very greatful for an answer to this question.
Best regards
Kjell Adrian
Sweden
You would be better off with the Radeon 6450 as it's slightly faster and consumes less power. I'm using a Sapphire Radeon 6450 (1GB DDR3 model) with my HTPC and it handles all video perfectly including Blu-ray and 3D Blu-ray (1080p).