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GeForce GTS 250 1GB vs Radeon HD 5450


Intro

The GeForce GTS 250 1GB has a clock speed of 738 MHz and a GDDR3 memory speed of 1100 MHz. It also features a 256-bit bus, and uses a 65/55 nm design. It is made up of 128 SPUs, 64 TAUs, and 16 Raster Operation Units.

Compare that to the Radeon HD 5450, which uses a 40 nm design. AMD has set the core frequency at 650 MHz. The DDR3 RAM runs at a frequency of 800 MHz on this model. It features 80(16x5) SPUs along with 8 Texture Address Units and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 5450 19 Watts
GeForce GTS 250 1GB 145 Watts
Difference: 126 Watts (663%)

Memory Bandwidth

In theory, the GeForce GTS 250 1GB should be 450% faster than the Radeon HD 5450 overall, due to its higher bandwidth. (explain)

GeForce GTS 250 1GB 70400 MB/sec
Radeon HD 5450 12800 MB/sec
Difference: 57600 (450%)

Texel Rate

The GeForce GTS 250 1GB will be quite a bit (about 808%) better at texture filtering than the Radeon HD 5450. (explain)

GeForce GTS 250 1GB 47232 Mtexels/sec
Radeon HD 5450 5200 Mtexels/sec
Difference: 42032 (808%)

Pixel Rate

The GeForce GTS 250 1GB should be a lot (about 354%) better at anti-aliasing than the Radeon HD 5450, and also capable of handling higher screen resolutions while still performing well. (explain)

GeForce GTS 250 1GB 11808 Mpixels/sec
Radeon HD 5450 2600 Mpixels/sec
Difference: 9208 (354%)

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 5450

Specifications

Display Specifications

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Model GeForce GTS 250 1GB Radeon HD 5450
Manufacturer nVidia AMD
Year March 3, 2009 February 4, 2010
Code Name G92a/b Cedar PRO
Memory 1024 MB 512 MB
Core Speed 738 MHz 650 MHz
Memory Speed 2200 MHz 1600 MHz
Power (Max TDP) 145 watts 19 watts
Bandwidth 70400 MB/sec 12800 MB/sec
Texel Rate 47232 Mtexels/sec 5200 Mtexels/sec
Pixel Rate 11808 Mpixels/sec 2600 Mpixels/sec
Unified Shaders 128 80(16x5)
Texture Mapping Units 64 8
Render Output Units 16 4
Bus Type GDDR3 DDR3
Bus Width 256-bit 64-bit
Fab Process 65/55 nm 40 nm
Transistors 754 million 292 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 max amount of information (counted in megabytes per second) that can be transferred past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The higher the texel rate, 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 most pixels 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 number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on many other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the max fill rate.

GeForce GTS 250 1GB

Radeon HD 5450

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