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GeForce GTS 450 1GB vs Radeon HD 4870 1GB

Intro

The GeForce GTS 450 1GB comes with a GPU clock speed of 783 MHz, and the 1024 MB of GDDR5 RAM runs at 902 MHz through a 128-bit bus. It also is comprised of 192 SPUs, 32 TAUs, and 16 ROPs.

Compare those specifications to the Radeon HD 4870 1GB, which makes use of a 55 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory is set to run at a frequency of 900 MHz on this specific card. It features 800(160x5) SPUs as well as 40 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB 106 Watts
Radeon HD 4870 1GB 150 Watts
Difference: 44 Watts (42%)

Memory Bandwidth

Performance-wise, the Radeon HD 4870 1GB should theoretically be a lot better than the GeForce GTS 450 1GB overall. (explain)

Radeon HD 4870 1GB 115200 MB/sec
GeForce GTS 450 1GB 57728 MB/sec
Difference: 57472 (100%)

Texel Rate

The Radeon HD 4870 1GB will be a little bit (about 20%) faster with regards to anisotropic filtering than the GeForce GTS 450 1GB. (explain)

Radeon HD 4870 1GB 30000 Mtexels/sec
GeForce GTS 450 1GB 25056 Mtexels/sec
Difference: 4944 (20%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the GeForce GTS 450 1GB is the winner, not by a very large margin though. (explain)

GeForce GTS 450 1GB 12528 Mpixels/sec
Radeon HD 4870 1GB 12000 Mpixels/sec
Difference: 528 (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

GeForce GTS 450 1GB

Amazon.com

Radeon HD 4870 1GB

Amazon.com

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 GTS 450 1GB Radeon HD 4870 1GB
Manufacturer nVidia AMD
Year September 2010 Jun 25, 2008
Code Name GF106 RV770 XT
Fab Process 40 nm 55 nm
Bus PCIe x16 PCIe 2.0 x16
Memory 1024 MB 1024 MB
Core Speed 783 MHz 750 MHz
Shader Speed 1566 MHz (N/A) MHz
Memory Speed 902 MHz (3608 MHz effective) 900 MHz (3600 MHz effective)
Unified Shaders 192 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0
Power (Max TDP) 106 watts 150 watts
Shader Model 5.0 4.1
Bandwidth 57728 MB/sec 115200 MB/sec
Texel Rate 25056 Mtexels/sec 30000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 12000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in MB per second) that can be moved past the external memory interface in one second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better 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 applied in one second. This is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

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