Radeon HD 4730 vs Radeon HD 6950

Intro

Compare those specs to the Radeon HD 6950, which features a GPU core clock speed of 800 MHz, and 1024 MB of GDDR5 RAM running at 1250 MHz through a 256-bit bus. It also is made up of 1408 SPUs, 88 Texture Address Units, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4730		140 Watts
Radeon HD 6950		200 Watts
	Difference: 60 Watts (43%)

Memory Bandwidth

Performance-wise, the Radeon HD 6950 should in theory be a lot superior to the Radeon HD 4730 overall. (explain)

Radeon HD 6950		160000 MB/sec
Radeon HD 4730		57600 MB/sec
	Difference: 102400 (178%)

Texel Rate

The Radeon HD 6950 will be quite a bit (more or less 214%) faster with regards to AF than the Radeon HD 4730. (explain)

Radeon HD 6950		70400 Mtexels/sec
Radeon HD 4730		22400 Mtexels/sec
	Difference: 48000 (214%)

Pixel Rate

The Radeon HD 6950 is a lot (approximately 357%) more effective at AA than the Radeon HD 4730, and capable of handling higher resolutions more effectively. (explain)

Radeon HD 6950		25600 Mpixels/sec
Radeon HD 4730		5600 Mpixels/sec
	Difference: 20000 (357%)

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 largest amount of data (in units of megabytes per second) that can be transported over the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. If the card has DDR memory, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines 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 output rate is also dependant on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.