Radeon HD 6450 (OEM) 1GB vs Radeon HD 7750

Intro

Compare all of that to the Radeon HD 7750, which features clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 RAM. It features 512 SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM) 1GB		31 Watts
Radeon HD 7750		55 Watts
	Difference: 24 Watts (77%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 will be 150% faster than the Radeon HD 6450 (OEM) 1GB overall, due to its greater bandwidth. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 43200 (150%)

Texel Rate

The Radeon HD 7750 is much (about 327%) faster with regards to texture filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 19600 (327%)

Pixel Rate

The Radeon HD 7750 will be a lot (more or less 327%) faster with regards to anti-aliasing than the Radeon HD 6450 (OEM) 1GB, and should be capable of handling higher resolutions while still performing well. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 9800 (327%)

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 largest amount of information (in units of megabytes per second) that can be moved over the external memory interface within a second. It is calculated by multiplying the card's interface width by its memory speed. If the card has DDR RAM, it must be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, 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 applied per second. This figure is worked out by multiplying the total number 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 applied in one 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. Pixel rate 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 is also dependant 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 max fill rate.