Radeon HD 4750 vs Radeon HD 4850 2GB

Intro

Compare all that to the Radeon HD 4850 2GB, which uses a 55 nm design. AMD has clocked the core frequency at 625 MHz. The GDDR4 memory runs at a frequency of 993 MHz on this specific model. It features 800(160x5) SPUs as well as 40 TAUs and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon HD 4850 2GB		110 Watts
	Difference: 35 Watts (47%)

Memory Bandwidth

The Radeon HD 4850 2GB, in theory, should perform a lot faster than the Radeon HD 4750 in general. (explain)

Radeon HD 4850 2GB		63552 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 12352 (24%)

Texel Rate

The Radeon HD 4850 2GB will be a small bit (approximately 7%) better at anisotropic filtering than the Radeon HD 4750. (explain)

Radeon HD 4850 2GB		25000 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 1640 (7%)

Pixel Rate

The Radeon HD 4750 is just a bit (about 17%) more effective at AA than the Radeon HD 4850 2GB, and will be capable of handling higher resolutions more effectively. (explain)

Radeon HD 4750		11680 Mpixels/sec
Radeon HD 4850 2GB		10000 Mpixels/sec
	Difference: 1680 (17%)

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 (measured in MB per second) that can be moved over the external memory interface in one second. It's calculated by multiplying the bus width by its memory speed. If the card has DDR memory, it must be multiplied by 2 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, High Dynamic Range and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels the video card could possibly write to its local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Render Output Units by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate is also dependant on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to reach the maximum fill rate.