Gaming Performance Comparison
In terms of overall gaming performance, the graphical capabilities of the AMD Radeon R9 270 are massively better than the Nvidia GeForce GTX 645 (OEM).
The Radeon R9 270 has a 77 MHz higher core clock speed and 32 more Texture Mapping Units than the GTX 645. This results in the Radeon R9 270 providing 32.5 GTexel/s better texturing performance. This still holds weight but shader performance is generally more relevant, particularly since both of these GPUs support at least DirectX 10.
The Radeon R9 270 has a 77 MHz higher core clock speed and 16 more Render Output Units than the GTX 645. This results in the Radeon R9 270 providing 15.6 GPixel/s better pixeling performance. However, both GPUs support DirectX 9 or above, and pixeling performance is only really relevant when comparing older cards.
The Radeon R9 270 was released less than a year after the GTX 645, and so they are likely to have similar driver support for optimizing performance when running the latest games.
The Radeon R9 270 has 1024 MB more video memory than the GTX 645, so is likely to be much better at displaying game textures at higher resolutions. This is supported by the fact that the Radeon R9 270 also has superior memory performance overall.
The Radeon R9 270 has 115.2 GB/sec greater memory bandwidth than the GTX 645, which means that the memory performance of the Radeon R9 270 is massively better than the GTX 645.
The Radeon R9 270 has 1280 Shader Processing Units and the GeForce GTX 645 (OEM) has 576. However, the actual shader performance of the Radeon R9 270 is 1066 and the actual shader performance of the GTX 645 is 511. The Radeon R9 270 having 555 better shader performance and an altogether better performance when taking into account other relevant data means that the Radeon R9 270 delivers a massively smoother and more efficient experience when processing graphical data than the GTX 645.
The Radeon R9 270 requires 150 Watts to run and the GeForce GTX 645 (OEM) requires 65 Watts. We would recommend a PSU with at least 500 Watts for the Radeon R9 270 and a PSU with at least 450 Watts for the GTX 645. The Radeon R9 270 requires 85 Watts more than the GTX 645 to run. The difference is significant enough that the Radeon R9 270 may have an adverse affect on your yearly electricity bills in comparison to the GTX 645.
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| Core Speed | 900 MHz |  | vs | | 823 MHz |
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| Architecture | GCN 1.1 Curacao PRO | | | | Kepler GK106 |
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| Notebook GPU | no | | | | no |
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| SLI/Crossfire | yes |  | vs | | no |
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| Dedicated | yes |  | vs |  | yes |
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| Release Date | 13 Nov 2013 | | | | 22 Apr 2013 |
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| GPU Link | GD Link | | | | GD Link |
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| Approved |  | | | |  |
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| Comparison | | | | | |
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| Memory | 2048 MB |  | vs | | 1024 MB |
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| Memory Speed | 1400 MHz |  | vs | | 1000 MHz |
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| Memory Bus | 256 Bit |  | vs | | 128 Bit |
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| Memory Type | GDDR5 |  | vs |  | GDDR5 |
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| Memory Bandwidth | 179.2GB/sec |  | vs | | 64GB/sec |
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| L2 Cache |
512 KB |
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384 KB |
| Comparison | | | | | |
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| Shader Processing Units | 1280 |  | vs | | 576 |
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| Actual Shader Performance | 1066 |  | vs | | 511 |
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| Technology | 28nm |  | vs |  | 28nm |
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| Texture Mapping Units | 80 |  | vs | | 48 |
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| Texture Rate | 72 GTexel/s |  | vs | | 39.5 GTexel/s |
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| Render Output Units | 32 |  | vs | | 16 |
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| Pixel Rate | 28.8 GPixel/s |  | vs | | 13.2 GPixel/s |
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| Comparison | | | | | |
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| DirectX | 11.2 |  | vs | | 11.1 |
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| Shader Model | 5.0 |  | vs |  | 5.0 |
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| Open GL | 4.3 |  | vs |  | 4.3 |
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| Max Resolution (WxH) | 4096x2160 |  | vs |  | 4096x2160 |
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| VGA Connections | 0 | | vs | | 0 |
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| DVI Connections | 2 |  | vs |  | 2 |
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| HDMI Connections | 1 |  | vs |  | 1 |
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| Comparison | | | | | |
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| Max Power | 150 Watts | | vs |  | 65 Watts |
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| Recommended RAM | 8 GB |  | vs |  | 8 GB |
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| Recommended Screen Size | 1920x1080 | | | | 1600x900 |
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| Recommended PSU | 500 Watts & 32 Amps | | vs |  | 450 Watts & 30 Amps |
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| Performance Value | | |  | | |
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| Mini Review | Radeon R9 270 is a fast-middle-class graphics card based on the Curacao PRO of the GCN architecture.
The Curacao PRO Core is a redesign of the Pitcairn XT Core used on Radeon HD 7870. It offers 1280 Shader Processing Units, 80 TMUs and 32 ROPs, on a 256-bit memory interface but has support for DirectX 11.2 and AMD's PowerTune technology.
Furthermore when compared to Radeon HD 7870, Radeon R9 270 comes with a central unit clocked at 900MHz and goes up to 925MHz while its operating memory clock is of 1400MHz. As a result, the card offers extra bandwidth but has a superior TDP.
Benchmarks indicate its performance is comparable to Radeon HD 7870. | | | | GeForce GTX 645 (OEM) is a fast-middle-class Graphics Card based on the 28nm, Kepler architecture.
Set to replace the already released, in 2012, Fermi based, GeForce GT 645, it equips a Kepler GK106 Core with 576 Shader Processing Units, 48 TMUs and 16 ROPs, on a 128-bit memory interface of fast GDDR5. The central unit runs at 823MHz (up to 888MHz, in Turbo Mode) and the memory clock operates at 1000MHz.
Benchmarks indicate its performance is only very slightly below next-in-series GeForce GTX 650, because despite featuring one extra SMx activated, GeForce GTX 650 is higher-clocked and offers more bandwidth. |
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