Radeon HD 4750 vs Radeon HD 6450 (OEM)

Intro

Compare all that to the Radeon HD 6450 (OEM), which comes with a GPU core clock speed of 625 MHz, and 512 MB of GDDR3 memory running at 800 MHz through a 64-bit bus. It also is made up of 160 SPUs, 8 TAUs, and 4 Raster Operation Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 4750		75 Watts
	Difference: 44 Watts (142%)

Memory Bandwidth

The Radeon HD 4750 should in theory perform quite a bit faster than the Radeon HD 6450 (OEM) overall. (explain)

Radeon HD 4750		51200 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 38400 (300%)

Texel Rate

The Radeon HD 4750 will be a lot (about 367%) better at texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4750		23360 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 18360 (367%)

Pixel Rate

The Radeon HD 4750 will be much (approximately 367%) faster with regards to FSAA than the Radeon HD 6450 (OEM), and will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 9180 (367%)

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: Bandwidth is the maximum amount of data (in units of MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the card's bus width by its memory clock speed. If it uses DDR type RAM, the result should be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The better the bandwidth is, 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 texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly record to its local memory in a second - measured in millions of pixels per second. The number is calculated by multiplying the amount of Render Output Units 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 fill rate also depends on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.