GeForce GTX 750 vs Radeon HD 4650 512MB

Intro

Compare those specifications to the Radeon HD 4650 512MB, which has clock speeds of 600 MHz on the GPU, and 500 MHz on the 512 MB of DDR2 RAM. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

The GeForce GTX 750 should theoretically be quite a bit faster than the Radeon HD 4650 512MB overall. (explain)

GeForce GTX 750		80000 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 64000 (400%)

Texel Rate

The GeForce GTX 750 should be a lot (more or less 70%) more effective at AF than the Radeon HD 4650 512MB. (explain)

GeForce GTX 750		32640 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 13440 (70%)

Pixel Rate

The GeForce GTX 750 is much (about 240%) more effective at anti-aliasing than the Radeon HD 4650 512MB, and also should be capable of handling higher screen resolutions more effectively. (explain)

GeForce GTX 750		16320 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 11520 (240%)

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 (counted in megabytes per second) that can be moved across the external memory interface in a second. The number is calculated by multiplying the bus width by its memory clock speed. In the case of DDR type memory, it must be multiplied by 2 once 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 anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed per second. This figure is calculated by multiplying the total texture units 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 processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate also depends on quite a few other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the max fill rate.