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GeForce GTS 450 vs Radeon HD 3850 256MB

Intro

The GeForce GTS 450 uses a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 RAM is set to run at a frequency of 902 MHz on this particular model. It features 192 SPUs along with 32 Texture Address Units and 16 ROPs.

Compare that to the Radeon HD 3850 256MB, which comes with a clock frequency of 668 MHz and a GDDR3 memory frequency of 828 MHz. It also makes use of a 256-bit memory bus, and makes use of a 55 nm design. It is made up of 320(64x5) SPUs, 16 Texture Address Units, and 16 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 3850 256MB 75 Watts
GeForce GTS 450 106 Watts
Difference: 31 Watts (41%)

Memory Bandwidth

Theoretically speaking, the GeForce GTS 450 will be 9% faster than the Radeon HD 3850 256MB overall, because of its greater data rate. (explain)

GeForce GTS 450 57728 MB/sec
Radeon HD 3850 256MB 52992 MB/sec
Difference: 4736 (9%)

Texel Rate

The GeForce GTS 450 is a lot (approximately 134%) more effective at AF than the Radeon HD 3850 256MB. (explain)

GeForce GTS 450 25056 Mtexels/sec
Radeon HD 3850 256MB 10688 Mtexels/sec
Difference: 14368 (134%)

Pixel Rate

If running with lots of anti-aliasing is important to you, then the GeForce GTS 450 is a better choice, but not by far. (explain)

GeForce GTS 450 12528 Mpixels/sec
Radeon HD 3850 256MB 10688 Mpixels/sec
Difference: 1840 (17%)

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 3850 256MB

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 256MB
Manufacturer nVidia AMD
Year September 2010 Nov 19, 2007
Code Name GF106 RV670 PRO
Memory 512 MB 256 MB
Core Speed 783 MHz 668 MHz
Memory Speed 3608 MHz 1656 MHz
Power (Max TDP) 106 watts 75 watts
Bandwidth 57728 MB/sec 52992 MB/sec
Texel Rate 25056 Mtexels/sec 10688 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 10688 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: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transported past the external memory interface within a second. It is worked out by multiplying the card's interface width by its memory speed. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the bandwidth is, 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 processed in one second. This is calculated by multiplying the total amount of texture units 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 processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on lots of other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Display Prices

Hide Prices

GeForce GTS 450

Amazon.com

Check prices at:

Radeon HD 3850 256MB

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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