Radeon HD 4750 vs Radeon R9 280

Intro

Compare those specifications to the Radeon R9 280, which features GPU core speed of 933 MHz, and 3072 MB of GDDR5 RAM set to run at 1250 MHz through a 384-bit bus. It also features 1792 Stream Processors, 112 TAUs, and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4750		75 Watts
Radeon R9 280		250 Watts
	Difference: 175 Watts (233%)

Memory Bandwidth

The Radeon R9 280 should theoretically perform much faster than the Radeon HD 4750 overall. (explain)

Radeon R9 280		240000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 188800 (369%)

Texel Rate

The Radeon R9 280 should be much (more or less 347%) more effective at texture filtering than the Radeon HD 4750. (explain)

Radeon R9 280		104496 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 81136 (347%)

Pixel Rate

The Radeon R9 280 will be much (more or less 156%) more effective at FSAA than the Radeon HD 4750, and also capable of handling higher resolutions better. (explain)

Radeon R9 280		29856 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 18176 (156%)

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 data (in units of MB per second) that can be moved past the external memory interface within a second. It is calculated by multiplying the card's bus width by its memory clock speed. If it uses DDR RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen 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 amount of texture units of the card by the core speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.