GeForce GT 240 GDDR5 1GB vs Radeon HD 4670 1GB

Intro

Compare that to the Radeon HD 4670 1GB, which comes with a clock frequency of 750 MHz and a GDDR4/GDDR3/DDR3/DDR2 memory speed of 1100 MHz. It also uses a 128-bit bus, and uses a 55 nm design. It features 320(64x5) SPUs, 32 Texture Address Units, and 8 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Both cards have the same power consumption.

Memory Bandwidth

In theory, the GeForce GT 240 GDDR5 1GB is 55% quicker than the Radeon HD 4670 1GB overall, because of its greater bandwidth. (explain)

GeForce GT 240 GDDR5 1GB		54400 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 19200 (55%)

Texel Rate

The Radeon HD 4670 1GB is a lot (more or less 36%) more effective at anisotropic filtering than the GeForce GT 240 GDDR5 1GB. (explain)

Radeon HD 4670 1GB		24000 Mtexels/sec
GeForce GT 240 GDDR5 1GB		17600 Mtexels/sec
	Difference: 6400 (36%)

Pixel Rate

The Radeon HD 4670 1GB will be much (about 36%) more effective at anti-aliasing than the GeForce GT 240 GDDR5 1GB, and able to handle higher resolutions while still performing well. (explain)

Radeon HD 4670 1GB		6000 Mpixels/sec
GeForce GT 240 GDDR5 1GB		4400 Mpixels/sec
	Difference: 1600 (36%)

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: Memory bandwidth is the largest amount of information (in units of megabytes per second) that can be transferred past the external memory interface in one second. It's calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

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

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