Radeon HD 4650 512MB vs Radeon HD 6450 (OEM)

Intro

Compare those specifications to the Radeon HD 6450 (OEM), which features clock speeds of 625 MHz on the GPU, and 800 MHz on the 512 MB of GDDR3 memory. It features 160 SPUs as well as 8 TAUs and 4 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 4650 512MB		55 Watts
	Difference: 24 Watts (77%)

Memory Bandwidth

As far as performance goes, the Radeon HD 4650 512MB should theoretically be much better than the Radeon HD 6450 (OEM) in general. (explain)

Radeon HD 4650 512MB		16000 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 3200 (25%)

Texel Rate

The Radeon HD 4650 512MB should be quite a bit (about 284%) more effective at texture filtering than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4650 512MB		19200 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 14200 (284%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 4650 512MB is a better choice, by a large margin. (explain)

Radeon HD 4650 512MB		4800 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 2300 (92%)

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 max amount of data (counted in MB per second) that can be transferred across the external memory interface in a second. It is calculated by multiplying the card's bus width by its memory clock speed. If the card has DDR RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's 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 amount of texture map elements (texels) that are processed in one second. This figure is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The higher the texel rate, the better the graphics card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory in a second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka 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 of the card - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.