GeForce GT 420 vs Radeon HD 4750

Intro

Compare all of 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 RAM. It features 640(128x5) SPUs as well as 32 Texture Address Units and 16 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon HD 4750		75 Watts
	Difference: 25 Watts (50%)

Memory Bandwidth

The Radeon HD 4750 should in theory perform quite a bit faster than the GeForce GT 420 overall. (explain)

Radeon HD 4750		51200 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 22400 (78%)

Texel Rate

The Radeon HD 4750 will be quite a bit (approximately 317%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)

Radeon HD 4750		23360 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 17760 (317%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 4750 is a better choice, and very much so. (explain)

Radeon HD 4750		11680 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 8880 (317%)

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 largest amount of data (in units of megabytes per second) that can be transferred past the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. If it uses DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is worked out by multiplying the total amount of texture units of the card by the core clock 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 processed in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory per second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.