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GeForce GTS 450 1GB vs Radeon HD 4770

Intro

The GeForce GTS 450 1GB makes use of a 40 nm design. nVidia has clocked the core speed at 783 MHz. The GDDR5 RAM is set to run at a speed of 902 MHz on this card. It features 192 SPUs as well as 32 TAUs and 16 ROPs.

Compare those specs to the Radeon HD 4770, which uses a 40 nm design. AMD has clocked the core speed at 750 MHz. The GDDR5 RAM works at a speed of 800 MHz on this model. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

(No game benchmarks for this combination yet.)

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

The GeForce GTS 450 1GB should in theory perform a bit faster than the Radeon HD 4770 overall. (explain)

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

Texel Rate

The GeForce GTS 450 1GB is a bit (more or less 4%) more effective at texture 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

If using a high resolution is important to you, then the GeForce GTS 450 1GB is the winner, though only just barely. (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

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

Model GeForce GTS 450 1GB Radeon HD 4770
Manufacturer nVidia AMD
Year September 2010 Apr 28, 2009
Code Name GF106 RV740
Fab Process 40 nm 40 nm
Bus PCIe x16 PCIe 2.0 x16
Memory 1024 MB 512 MB
Core Speed 783 MHz 750 MHz
Shader Speed 1566 MHz (N/A) MHz
Memory Speed 902 MHz (3608 MHz effective) 800 MHz (3200 MHz effective)
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
DirectX Version DirectX 11 DirectX 10.1
OpenGL Version OpenGL 4.1 OpenGL 3.0
Power (Max TDP) 106 watts 80 watts
Shader Model 5.0 4.1
Bandwidth 57728 MB/sec 51200 MB/sec
Texel Rate 25056 Mtexels/sec 24000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 12000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (measured in megabytes per second) that can be transported across the external memory interface in one second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed per second. This number is worked out by multiplying the total texture units by the core speed of the chip. The better this number, the better the video card will be at handling 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 video card could possibly record to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Raster Operations Pipelines by the clock speed of the card. ROPs (Raster Operations Pipelines - also sometimes called 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, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.

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