GeForce GT 420 vs Radeon R9 M295X

Intro

Compare all that to the Radeon R9 M295X, which uses a 28 nm design. AMD has clocked the core frequency at 750 MHz. The GDDR5 memory is set to run at a frequency of 1375 MHz on this particular card. It features 2048 SPUs as well as 128 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon R9 M295X		125 Watts
	Difference: 75 Watts (150%)

Memory Bandwidth

Theoretically, the Radeon R9 M295X should be quite a bit faster than the GeForce GT 420 overall. (explain)

Radeon R9 M295X		176000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 147200 (511%)

Texel Rate

The Radeon R9 M295X is quite a bit (more or less 1614%) more effective at anisotropic filtering than the GeForce GT 420. (explain)

Radeon R9 M295X		96000 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 90400 (1614%)

Pixel Rate

The Radeon R9 M295X is much (about 757%) faster with regards to anti-aliasing than the GeForce GT 420, and able to handle higher screen resolutions while still performing well. (explain)

Radeon R9 M295X		24000 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 21200 (757%)

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 information (counted in MB per second) that can be moved across the external memory interface in one second. The number is worked out by multiplying the bus width by its memory speed. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied in one second. This is worked out by multiplying the total 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 the video card can possibly write to the local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.