Radeon HD 4650 1GB vs Radeon HD 7970

Intro

Compare all that to the Radeon HD 7970, which uses a 28 nm design. AMD has clocked the core frequency at 925 MHz. The GDDR5 RAM runs at a speed of 1375 MHz on this card. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon HD 7970		250 Watts
	Difference: 195 Watts (355%)

Memory Bandwidth

Theoretically, the Radeon HD 7970 should perform quite a bit faster than the Radeon HD 4650 1GB overall. (explain)

Radeon HD 7970		264000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 241600 (1079%)

Texel Rate

The Radeon HD 7970 should be a lot (approximately 517%) faster with regards to anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Radeon HD 7970		118400 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 99200 (517%)

Pixel Rate

The Radeon HD 7970 will be a lot (about 517%) more effective at FSAA than the Radeon HD 4650 1GB, and also capable of handling higher resolutions without losing too much performance. (explain)

Radeon HD 7970		29600 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 24800 (517%)

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 transferred across the external memory interface in one second. It is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This is worked out by multiplying the total texture units by the core clock speed of the chip. The higher the texel rate, the better the video card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card can possibly record to the local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate also depends on many other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the max fill rate.