Radeon HD 6450 (OEM) 1GB vs Radeon HD 7770

Intro

Compare those specs to the Radeon HD 7770, which features a core clock speed of 1000 MHz and a GDDR5 memory frequency of 1125 MHz. It also features a 128-bit bus, and makes use of a 28 nm design. It is comprised of 640 SPUs, 40 Texture Address Units, and 16 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 7770		80 Watts
	Difference: 49 Watts (158%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7770 should be 150% quicker than the Radeon HD 6450 (OEM) 1GB overall, due to its greater bandwidth. (explain)

Radeon HD 7770		72000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 43200 (150%)

Texel Rate

The Radeon HD 7770 is much (about 567%) faster with regards to anisotropic filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 7770		40000 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 34000 (567%)

Pixel Rate

If running with 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
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 13000 (433%)

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 maximum amount of information (measured in megabytes per second) that can be moved across the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. If it uses DDR RAM, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock 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 maximum number of pixels that the graphics card can possibly record to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.