Radeon HD 6450 (OEM) 1GB vs Radeon HD 6950 2GB

Intro

Compare that to the Radeon HD 6950 2GB, which comes with a clock speed of 800 MHz and a GDDR5 memory speed of 1250 MHz. It also uses a 256-bit bus, and uses a 40 nm design. It is made up of 1408 SPUs, 88 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon HD 6950 2GB		200 Watts
	Difference: 169 Watts (545%)

Memory Bandwidth

Theoretically, the Radeon HD 6950 2GB should perform quite a bit faster than the Radeon HD 6450 (OEM) 1GB overall. (explain)

Radeon HD 6950 2GB		160000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 131200 (456%)

Texel Rate

The Radeon HD 6950 2GB will be quite a bit (about 1073%) better at anisotropic filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 6950 2GB		70400 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 64400 (1073%)

Pixel Rate

The Radeon HD 6950 2GB should be much (more or less 753%) faster with regards to anti-aliasing than the Radeon HD 6450 (OEM) 1GB, and also should be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon HD 6950 2GB		25600 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 22600 (753%)

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

Specifications

Memory Bandwidth: Memory bandwidth is the max amount of data (in units of MB per second) that can be moved across the external memory interface in a second. It is worked out by multiplying the card's bus width by the speed of its memory. If it uses DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The higher the 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 in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The number is calculated by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output 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 max fill rate.