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GeForce GTS 450 vs Radeon HD 7770

Intro

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

Compare those specs to the Radeon HD 7770, which comes with a clock frequency of 1000 MHz and a GDDR5 memory speed of 1125 MHz. It also features a 128-bit memory bus, and uses a 28 nm design. It is made up of 640 SPUs, 40 TAUs, and 16 Raster Operation Units.

(No game benchmarks for this combination yet.)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7770 80 Watts
GeForce GTS 450 106 Watts
Difference: 26 Watts (33%)

Memory Bandwidth

The Radeon HD 7770 should theoretically be a lot faster than the GeForce GTS 450 overall. (explain)

Radeon HD 7770 72000 MB/sec
GeForce GTS 450 57728 MB/sec
Difference: 14272 (25%)

Texel Rate

The Radeon HD 7770 is much (more or less 60%) faster with regards to texture filtering than the GeForce GTS 450. (explain)

Radeon HD 7770 40000 Mtexels/sec
GeForce GTS 450 25056 Mtexels/sec
Difference: 14944 (60%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7770 is the winner, by a large margin. (explain)

Radeon HD 7770 16000 Mpixels/sec
GeForce GTS 450 12528 Mpixels/sec
Difference: 3472 (28%)

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

Amazon.com

Radeon HD 7770

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 Radeon HD 7770
Manufacturer nVidia AMD
Year September 2010 February 2012
Code Name GF106 Cape Verde XT
Fab Process 40 nm 28 nm
Bus PCIe x16 PCIe 3.0 x16
Memory 512 MB 1024 MB
Core Speed 783 MHz 1000 MHz
Shader Speed 1566 MHz (N/A) MHz
Memory Speed 902 MHz (3608 MHz effective) 1125 MHz (4500 MHz effective)
Unified Shaders 192 640
Texture Mapping Units 32 40
Render Output Units 16 16
Bus Type GDDR5 GDDR5
Bus Width 128-bit 128-bit
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 4.1 OpenGL 4.2
Power (Max TDP) 106 watts 80 watts
Shader Model 5.0 5.0
Bandwidth 57728 MB/sec 72000 MB/sec
Texel Rate 25056 Mtexels/sec 40000 Mtexels/sec
Pixel Rate 12528 Mpixels/sec 16000 Mpixels/sec

Memory Bandwidth: Bandwidth is the max amount of data (counted in MB per second) that can be transferred past the external memory interface in one second. It's worked out by multiplying the bus width by its memory speed. If it uses DDR memory, it should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total amount of texture units by the core speed of the chip. The higher this number, the better the 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 card can possibly write to its local memory per second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the the core 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 fill rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

Comments

2 Responses to “GeForce GTS 450 vs Radeon HD 7770”
rodrigo says:
quero saber se a gts 450e melho do que a amd sapphire 7770 ati
arnaldo says:
7770 é bem melhor que a 450

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