Radeon HD 6450 (OEM) 1GB vs Radeon HD 7870 XT

Intro

Compare all of that to the Radeon HD 7870 XT, which makes use of a 28 nm design. AMD has clocked the core speed at 925 MHz. The GDDR5 memory works at a speed of 1500 MHz on this model. It features 1536 SPUs as well as 96 Texture Address Units and 32 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 7870 XT		185 Watts
	Difference: 154 Watts (497%)

Memory Bandwidth

Theoretically, the Radeon HD 7870 XT should perform a lot faster than the Radeon HD 6450 (OEM) 1GB in general. (explain)

Radeon HD 7870 XT		192000 MB/sec
Radeon HD 6450 (OEM) 1GB		28800 MB/sec
	Difference: 163200 (567%)

Texel Rate

The Radeon HD 7870 XT will be a lot (approximately 1380%) better at texture filtering than the Radeon HD 6450 (OEM) 1GB. (explain)

Radeon HD 7870 XT		88800 Mtexels/sec
Radeon HD 6450 (OEM) 1GB		6000 Mtexels/sec
	Difference: 82800 (1380%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7870 XT is superior to the Radeon HD 6450 (OEM) 1GB, by a large margin. (explain)

Radeon HD 7870 XT		29600 Mpixels/sec
Radeon HD 6450 (OEM) 1GB		3000 Mpixels/sec
	Difference: 26600 (887%)

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 information (in units of megabytes per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the card's interface width by the speed of its memory. If it uses DDR type RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster 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 in one second. This figure is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the graphics 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 amount of pixels the video card could possibly record to its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.