GeForce GTX 650 Ti vs Radeon HD 4790

Intro

Compare all that to the Radeon HD 4790, which uses a 55 nm design. AMD has clocked the core speed at 600 MHz. The GDDR5 RAM works at a speed of 800 MHz on this model. 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

Memory Bandwidth

The Radeon HD 4790 should theoretically be a little bit faster than the GeForce GTX 650 Ti overall. (explain)

Radeon HD 4790		102400 MB/sec
GeForce GTX 650 Ti		86400 MB/sec
	Difference: 16000 (19%)

Texel Rate

The GeForce GTX 650 Ti is quite a bit (about 209%) faster with regards to texture filtering than the Radeon HD 4790. (explain)

GeForce GTX 650 Ti		59392 Mtexels/sec
Radeon HD 4790		19200 Mtexels/sec
	Difference: 40192 (209%)

Pixel Rate

The GeForce GTX 650 Ti is much (more or less 55%) more effective at anti-aliasing than the Radeon HD 4790, and also should be capable of handling higher resolutions while still performing well. (explain)

GeForce GTX 650 Ti		14848 Mpixels/sec
Radeon HD 4790		9600 Mpixels/sec
	Difference: 5248 (55%)

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 data (measured in megabytes per second) that can be transferred past the external memory interface in a second. It is worked out by multiplying the bus width by the speed of its memory. If it uses DDR memory, it should be multiplied by 2 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, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This is calculated by multiplying the total number of texture units of the card by the core clock speed of the chip. The better this number, the better the graphics 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 most pixels that the graphics card can possibly write to its local memory in one second - measured in millions of pixels per second. The number is calculated by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel fill rate also depends on many other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the max fill rate.