Radeon HD 4870 1GB vs Radeon HD 6450 (OEM)

Intro

Compare all that to the Radeon HD 6450 (OEM), which makes use of a 40 nm design. AMD has set the core frequency at 625 MHz. The GDDR3 memory runs at a speed of 800 MHz on this specific card. It features 160 SPUs as well as 8 TAUs and 4 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 6450 (OEM)		31 Watts
Radeon HD 4870 1GB		150 Watts
	Difference: 119 Watts (384%)

Memory Bandwidth

The Radeon HD 4870 1GB should in theory perform quite a bit faster than the Radeon HD 6450 (OEM) in general. (explain)

Radeon HD 4870 1GB		115200 MB/sec
Radeon HD 6450 (OEM)		12800 MB/sec
	Difference: 102400 (800%)

Texel Rate

The Radeon HD 4870 1GB is much (about 500%) faster with regards to AF than the Radeon HD 6450 (OEM). (explain)

Radeon HD 4870 1GB		30000 Mtexels/sec
Radeon HD 6450 (OEM)		5000 Mtexels/sec
	Difference: 25000 (500%)

Pixel Rate

The Radeon HD 4870 1GB will be quite a bit (about 380%) better at FSAA than the Radeon HD 6450 (OEM), and also will be able to handle higher screen resolutions without slowing down too much. (explain)

Radeon HD 4870 1GB		12000 Mpixels/sec
Radeon HD 6450 (OEM)		2500 Mpixels/sec
	Difference: 9500 (380%)

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 information (counted in MB per second) that can be moved past the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. If it uses DDR RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be processed in one second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip can possibly record to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.