GeForce GTX 650 vs Radeon HD 4750

Intro

Compare all that to the Radeon HD 4750, which has core speeds of 730 MHz on the GPU, and 800 MHz on the 512 MB of GDDR5 memory. It features 640(128x5) SPUs along with 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 4750		75 Watts
	Difference: 11 Watts (17%)

Memory Bandwidth

The GeForce GTX 650 should theoretically perform quite a bit faster than the Radeon HD 4750 overall. (explain)

GeForce GTX 650		80000 MB/sec
Radeon HD 4750		51200 MB/sec
	Difference: 28800 (56%)

Texel Rate

The GeForce GTX 650 should be much (approximately 45%) more effective at AF than the Radeon HD 4750. (explain)

GeForce GTX 650		33856 Mtexels/sec
Radeon HD 4750		23360 Mtexels/sec
	Difference: 10496 (45%)

Pixel Rate

The GeForce GTX 650 should be much (about 45%) faster with regards to FSAA than the Radeon HD 4750, and able to handle higher screen resolutions while still performing well. (explain)

GeForce GTX 650		16928 Mpixels/sec
Radeon HD 4750		11680 Mpixels/sec
	Difference: 5248 (45%)

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 information (counted in MB per second) that can be transferred over the external memory interface in one second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR type RAM, it must be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

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

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