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GeForce GTS 250 1GB vs Radeon HD 5670


Intro

The GeForce GTS 250 1GB has a core clock frequency of 738 MHz and a GDDR3 memory frequency of 1100 MHz. It also features a 256-bit memory bus, and uses a 65/55 nm design. It features 128 SPUs, 64 Texture Address Units, and 16 ROPs.

Compare those specifications to the Radeon HD 5670, which makes use of a 40 nm design. AMD has clocked the core speed at 775 MHz. The GDDR5 RAM works at a speed of 1000 MHz on this particular model. It features 400(80x5) SPUs as well as 20 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5670 61 Watts
GeForce GTS 250 1GB 145 Watts
Difference: 84 Watts (138%)

Memory Bandwidth

In theory, the GeForce GTS 250 1GB will be 10% faster than the Radeon HD 5670 overall, due to its higher bandwidth. (explain)

GeForce GTS 250 1GB 70400 MB/sec
Radeon HD 5670 64000 MB/sec
Difference: 6400 (10%)

Texel Rate

The GeForce GTS 250 1GB should be quite a bit (more or less 205%) better at anisotropic filtering than the Radeon HD 5670. (explain)

GeForce GTS 250 1GB 47232 Mtexels/sec
Radeon HD 5670 15500 Mtexels/sec
Difference: 31732 (205%)

Pixel Rate

The GeForce GTS 250 1GB should be a lot (approximately 90%) better at anti-aliasing than the Radeon HD 5670, and also capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTS 250 1GB 11808 Mpixels/sec
Radeon HD 5670 6200 Mpixels/sec
Difference: 5608 (90%)

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 250 1GB

Radeon HD 5670

Specifications

Display Specifications

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Model GeForce GTS 250 1GB Radeon HD 5670
Manufacturer nVidia AMD
Year March 3, 2009 January 14, 2010
Code Name G92a/b Redwood XT
Memory 1024 MB 1024 MB
Core Speed 738 MHz 775 MHz
Memory Speed 2200 MHz 4000 MHz
Power (Max TDP) 145 watts 61 watts
Bandwidth 70400 MB/sec 64000 MB/sec
Texel Rate 47232 Mtexels/sec 15500 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 6200 Mpixels/sec
Unified Shaders 128 400(80x5)
Texture Mapping Units 64 20
Render Output Units 16 8
Bus Type GDDR3 GDDR5
Bus Width 256-bit 128-bit
Fab Process 65/55 nm 40 nm
Transistors 754 million 627 million
Bus PCIe x16 2.0 PCIe 2.1 x16
DirectX Version DirectX 10 DirectX 11
OpenGL Version OpenGL 3.1 OpenGL 3.2

Memory Bandwidth: Bandwidth is the largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. It is calculated by multiplying the interface width by its memory speed. In the case of DDR type memory, it must be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the 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 number of texture map elements (texels) that are processed in one second. This figure is calculated by multiplying the total number of texture units of the card by the core speed of the chip. The better this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.

GeForce GTS 250 1GB

Radeon HD 5670

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