Radeon HD 4830 1GB vs Radeon HD 7750

Intro

Compare those specs to the Radeon HD 7750, which has clock speeds of 800 MHz on the GPU, and 1125 MHz on the 1024 MB of GDDR5 memory. It features 512 SPUs as well as 32 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7750		55 Watts
Radeon HD 4830 1GB		95 Watts
	Difference: 40 Watts (73%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7750 is 25% faster than the Radeon HD 4830 1GB in general, due to its higher data rate. (explain)

Radeon HD 7750		72000 MB/sec
Radeon HD 4830 1GB		57600 MB/sec
	Difference: 14400 (25%)

Texel Rate

The Radeon HD 7750 should be a lot (approximately 39%) more effective at anisotropic filtering than the Radeon HD 4830 1GB. (explain)

Radeon HD 7750		25600 Mtexels/sec
Radeon HD 4830 1GB		18400 Mtexels/sec
	Difference: 7200 (39%)

Pixel Rate

If running with a high screen resolution is important to you, then the Radeon HD 7750 is superior to the Radeon HD 4830 1GB, by far. (explain)

Radeon HD 7750		12800 Mpixels/sec
Radeon HD 4830 1GB		9200 Mpixels/sec
	Difference: 3600 (39%)

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: Memory bandwidth is the maximum amount of data (in units of megabytes per second) that can be moved across the external memory interface in one second. It is worked out by multiplying the card's bus 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 better the bandwidth is, 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 can be applied in one second. This is worked out by multiplying the total texture units by the core speed of the chip. The better 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 a second.

Pixel Rate: Pixel rate is the most pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. 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 quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.