 |
 |
GeForce GT 420 vs Radeon HD 6450 (OEM) 1GB
Intro
The GeForce GT 420 makes use of a 40 nm design. nVidia has set the core speed at 700 MHz. The GDDR3 memory works at a speed of 900 MHz on this specific card. It features 48 SPUs along with 8 Texture Address Units and 4 Rasterization Operator Units.Compare that to the Radeon HD 6450 (OEM) 1GB, which uses a 40 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 RAM is set to run at a speed of 900 MHz on this particular model. It features 160 SPUs along with 8 TAUs and 4 Rasterization Operator Units.
Power Usage and Theoretical Benchmarks
Power Consumption (Max TDP)
| Radeon HD 6450 (OEM) 1GB |
|
31 Watts |
| GeForce GT 420 |
|
50 Watts |
|
|
Memory Bandwidth
Both cards have the exact same memory bandwidth, so in theory they should have identical performance. (explain)
Texel Rate
The Radeon HD 6450 (OEM) 1GB should be a small bit (approximately 7%) faster with regards to texture filtering than the GeForce GT 420. (explain)| Radeon HD 6450 (OEM) 1GB |
|
6000 Mtexels/sec |
| GeForce GT 420 |
|
5600 Mtexels/sec |
|
|
Pixel Rate
If using a high screen resolution is important to you, then the Radeon HD 6450 (OEM) 1GB is the winner, not by a very large margin though. (explain)| Radeon HD 6450 (OEM) 1GB |
|
3000 Mpixels/sec |
| GeForce GT 420 |
|
2800 Mpixels/sec |
|
|
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:
|
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.
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 max amount of information (measured in megabytes per second) that can be transferred across the external memory interface in a second. It is worked out by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.
Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the graphics 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 number of pixels that the graphics chip can possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of Render Output Units by the clock speed of the card. 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.
GeForce GT 420Amazon.com
Check prices at:
|
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.
|
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).