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GeForce GTS 450 vs Radeon HD 4890 2GB

Intro

The GeForce GTS 450 has a GPU clock speed of 783 MHz, and the 512 MB of GDDR5 memory runs at 902 MHz through a 128-bit bus. It also is comprised of 192 Stream Processors, 32 Texture Address Units, and 16 ROPs.

Compare all of that to the Radeon HD 4890 2GB, which uses a 55 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a frequency of 975 MHz on this particular card. It features 800(160x5) SPUs along with 40 Texture Address Units and 16 Rasterization Operator Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 106 Watts
Radeon HD 4890 2GB 190 Watts
Difference: 84 Watts (79%)

Memory Bandwidth

Performance-wise, the Radeon HD 4890 2GB should theoretically be quite a bit superior to the GeForce GTS 450 overall. (explain)

Radeon HD 4890 2GB 124800 MB/sec
GeForce GTS 450 57728 MB/sec
Difference: 67072 (116%)

Texel Rate

The Radeon HD 4890 2GB will be a lot (about 60%) more effective at texture filtering than the GeForce GTS 450. (explain)

Radeon HD 4890 2GB 40000 Mtexels/sec
GeForce GTS 450 25056 Mtexels/sec
Difference: 14944 (60%)

Pixel Rate

The Radeon HD 4890 2GB is quite a bit (about 28%) more effective at FSAA than the GeForce GTS 450, and also will be able to handle higher resolutions without slowing down too much. (explain)

Radeon HD 4890 2GB 16000 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 3472 (28%)

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

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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 Radeon HD 4890 2GB
Manufacturer nVidia AMD
Year September 2010 Apr 2, 2009
Code Name GF106 RV790 XT
Memory 512 MB 2048 MB
Core Speed 783 MHz 1000 MHz
Memory Speed 3608 MHz 3900 MHz
Power (Max TDP) 106 watts 190 watts
Bandwidth 57728 MB/sec 124800 MB/sec
Texel Rate 25056 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 16000 Mpixels/sec
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
Fab Process 40 nm 55 nm
Transistors 1170 million 959 million
Bus PCIe x16 PCIe 2.0 x16
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0

Memory Bandwidth: Bandwidth is the maximum amount of information (counted in MB per second) that can be moved over the external memory interface in a second. It's worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR type memory, the result should be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the better 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 can be applied in one second. This number is worked out by multiplying the total texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics card could possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 4890 2GB

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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