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GeForce GTS 450 1GB vs Radeon HD 4770

Intro

The GeForce GTS 450 1GB features a GPU core speed of 783 MHz, and the 1024 MB of GDDR5 RAM is set to run at 902 MHz through a 128-bit bus. It also features 192 SPUs, 32 TAUs, and 16 Raster Operation Units.

Compare all of that to the Radeon HD 4770, which comes with a GPU core clock speed of 750 MHz, and 512 MB of GDDR5 RAM running at 800 MHz through a 128-bit bus. It also is comprised of 640(128x5) SPUs, 32 Texture Address Units, and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4770 80 Watts
GeForce GTS 450 1GB 106 Watts
Difference: 26 Watts (33%)

Memory Bandwidth

Performance-wise, the GeForce GTS 450 1GB should theoretically be a little bit better than the Radeon HD 4770 in general. (explain)

GeForce GTS 450 1GB 57728 MB/sec
Radeon HD 4770 51200 MB/sec
Difference: 6528 (13%)

Texel Rate

The GeForce GTS 450 1GB should be a bit (approximately 4%) better at anisotropic filtering than the Radeon HD 4770. (explain)

GeForce GTS 450 1GB 25056 Mtexels/sec
Radeon HD 4770 24000 Mtexels/sec
Difference: 1056 (4%)

Pixel Rate

The GeForce GTS 450 1GB should be a little bit (more or less 4%) faster with regards to AA than the Radeon HD 4770, and also able to handle higher screen resolutions better. (explain)

GeForce GTS 450 1GB 12528 Mpixels/sec
Radeon HD 4770 12000 Mpixels/sec
Difference: 528 (4%)

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

Radeon HD 4770

Amazon.com

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 4770
Manufacturer nVidia AMD
Year September 2010 Apr 28, 2009
Code Name GF106 RV740
Memory 1024 MB 512 MB
Core Speed 783 MHz 750 MHz
Memory Speed 3608 MHz 3200 MHz
Power (Max TDP) 106 watts 80 watts
Bandwidth 57728 MB/sec 51200 MB/sec
Texel Rate 25056 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 12000 Mpixels/sec
Unified Shaders 192 640(128x5)
Texture Mapping Units 32 32
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
Fab Process 40 nm 40 nm
Transistors 1170 million 826 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 max amount of data (counted in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's 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 amount of texture map elements (texels) that can be applied in one second. This is calculated by multiplying the total texture units of the card by the core speed of the chip. The better the texel rate, the better the 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 maximum number of pixels the video card can possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel rate also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the max fill rate.

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