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GeForce GTS 450 1GB vs Radeon HD 4850 2GB

Intro

The GeForce GTS 450 1GB has a clock speed of 783 MHz and a GDDR5 memory frequency of 902 MHz. It also makes use of a 128-bit memory bus, and uses a 40 nm design. It features 192 SPUs, 32 Texture Address Units, and 16 Raster Operation Units.

Compare all that to the Radeon HD 4850 2GB, which has a clock speed of 625 MHz and a GDDR4 memory speed of 993 MHz. It also makes use of a 256-bit memory bus, and uses a 55 nm design. It is made up of 800(160x5) SPUs, 40 Texture Address Units, and 16 ROPs.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTS 450 1GB 106 Watts
Radeon HD 4850 2GB 110 Watts
Difference: 4 Watts (4%)

Memory Bandwidth

The Radeon HD 4850 2GB should in theory be a small bit faster than the GeForce GTS 450 1GB in general. (explain)

Radeon HD 4850 2GB 63552 MB/sec
GeForce GTS 450 1GB 57728 MB/sec
Difference: 5824 (10%)

Texel Rate

The GeForce GTS 450 1GB should be a little bit (about 0%) faster with regards to AF than the Radeon HD 4850 2GB. (explain)

GeForce GTS 450 1GB 25056 Mtexels/sec
Radeon HD 4850 2GB 25000 Mtexels/sec
Difference: 56 (0%)

Pixel Rate

If running with a high resolution is important to you, then the GeForce GTS 450 1GB is the winner, by far. (explain)

GeForce GTS 450 1GB 12528 Mpixels/sec
Radeon HD 4850 2GB 10000 Mpixels/sec
Difference: 2528 (25%)

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 4850 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 1GB Radeon HD 4850 2GB
Manufacturer nVidia AMD
Year September 2010 Jun 25, 2008
Code Name GF106 RV770 PRO
Memory 1024 MB 2048 MB
Core Speed 783 MHz 625 MHz
Memory Speed 3608 MHz 1986 MHz
Power (Max TDP) 106 watts 110 watts
Bandwidth 57728 MB/sec 63552 MB/sec
Texel Rate 25056 Mtexels/sec 25000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 10000 Mpixels/sec
Unified Shaders 192 800(160x5)
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR4
Bus Width 128-bit 256-bit
Fab Process 40 nm 55 nm
Transistors 1170 million 956 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 largest amount of data (counted in megabytes per second) that can be transported across the external memory interface within a second. It is worked out by multiplying the bus width by the speed of its memory. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen 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 number of texture units by the core clock speed of the chip. The higher this number, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could 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 Render Output Units by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.

Display Prices

Hide Prices

GeForce GTS 450 1GB

Amazon.com

Check prices at:

Radeon HD 4850 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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