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GeForce GTS 450 1GB vs Radeon HD 3870 512MB

Intro

The GeForce GTS 450 1GB comes with a core clock speed of 783 MHz and a GDDR5 memory frequency of 902 MHz. It also makes use of a 128-bit bus, and uses a 40 nm design. It is comprised of 192 SPUs, 32 Texture Address Units, and 16 ROPs.

Compare those specs to the Radeon HD 3870 512MB, which makes use of a 55 nm design. AMD has clocked the core frequency at 775 MHz. The GDDR3 RAM is set to run at a speed of 900 MHz on this specific card. It features 320(64x5) SPUs as well as 16 TAUs and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

As far as performance goes, the GeForce GTS 450 1GB should in theory be a little bit better than the Radeon HD 3870 512MB overall. (explain)

GeForce GTS 450 1GB 57728 MB/sec
Radeon HD 3870 512MB 57600 MB/sec
Difference: 128 (0%)

Texel Rate

The GeForce GTS 450 1GB is a lot (approximately 102%) faster with regards to texture filtering than the Radeon HD 3870 512MB. (explain)

GeForce GTS 450 1GB 25056 Mtexels/sec
Radeon HD 3870 512MB 12400 Mtexels/sec
Difference: 12656 (102%)

Pixel Rate

The GeForce GTS 450 1GB is a bit (about 1%) more effective at FSAA than the Radeon HD 3870 512MB, and also will be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTS 450 1GB 12528 Mpixels/sec
Radeon HD 3870 512MB 12400 Mpixels/sec
Difference: 128 (1%)

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 GTS 450 1GB

Amazon.com

Check prices at:

Radeon HD 3870 512MB

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 GTS 450 1GB Radeon HD 3870 512MB
Manufacturer nVidia AMD
Year September 2010 Nov 19, 2007
Code Name GF106 RV670 XT
Memory 1024 MB 512 MB
Core Speed 783 MHz 775 MHz
Memory Speed 3608 MHz 1800 MHz
Power (Max TDP) 106 watts 106 watts
Bandwidth 57728 MB/sec 57600 MB/sec
Texel Rate 25056 Mtexels/sec 12400 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 12400 Mpixels/sec
Unified Shaders 192 320(64x5)
Texture Mapping Units 32 16
Render Output Units 16 16
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 1170 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 max amount of information (counted in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the bus width by the speed of its memory. If the card has DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed per second. This number is worked out by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video 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 the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called 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, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.

Display Prices

Hide Prices

GeForce GTS 450 1GB

Amazon.com

Check prices at:

Radeon HD 3870 512MB

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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