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GeForce GTS 450 vs Radeon HD 3850 X2

Intro

The GeForce GTS 450 makes use of a 40 nm design. nVidia has set the core speed at 783 MHz. The GDDR5 memory runs at a speed of 902 MHz on this specific model. It features 192 SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Compare all that to the Radeon HD 3850 X2, which has GPU core speed of 668 MHz, and 512 MB of GDDR3 RAM running at 828 MHz through a 256-bit bus. It also features 320(64x5) SPUs, 16 TAUs, and 16 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

As far as performance goes, the Radeon HD 3850 X2 should in theory be a lot better than the GeForce GTS 450 overall. (explain)

Radeon HD 3850 X2 105984 MB/sec
GeForce GTS 450 57728 MB/sec
Difference: 48256 (84%)

Texel Rate

The GeForce GTS 450 is a small bit (about 17%) better at texture filtering than the Radeon HD 3850 X2. (explain)

GeForce GTS 450 25056 Mtexels/sec
Radeon HD 3850 X2 21376 Mtexels/sec
Difference: 3680 (17%)

Pixel Rate

The Radeon HD 3850 X2 should be much (approximately 71%) more effective at AA than the GeForce GTS 450, and also should be able to handle higher screen resolutions while still performing well. (explain)

Radeon HD 3850 X2 21376 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 8848 (71%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

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GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 3850 X2

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 3850 X2
Manufacturer nVidia AMD
Year September 2010 Apr 4, 2008
Code Name GF106 RV670 PRO
Memory 512 MB 512 MB (x2)
Core Speed 783 MHz 668 MHz (x2)
Memory Speed 3608 MHz 1656 MHz (x2)
Power (Max TDP) 106 watts (Unknown) watts
Bandwidth 57728 MB/sec 105984 MB/sec
Texel Rate 25056 Mtexels/sec 21376 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 21376 Mpixels/sec
Unified Shaders 192 320(64x5) (x2)
Texture Mapping Units 32 16 (x2)
Render Output Units 16 16 (x2)
Bus Type GDDR5 GDDR3
Bus Width 128-bit 256-bit (x2)
Fab Process 40 nm 55 nm
Transistors 1170 million (Unknown) million
Bus PCIe x16 PCIe 2.0 x16/(internal PCIe 1.1 x16)
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 (in units of megabytes per second) that can be transported past the external memory interface in one second. It's worked out by multiplying the card's bus width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed per second. This is calculated by multiplying the total number of texture units by the core clock speed of the chip. The better the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the number 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 3850 X2

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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