GeForce GT 420 vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has a clock speed of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also makes use of a 256-bit memory bus, and uses a 28 nm design. It features 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GT 420		50 Watts
Radeon R9 M390X		125 Watts
	Difference: 75 Watts (150%)

Memory Bandwidth

In theory, the Radeon R9 M390X should perform a lot faster than the GeForce GT 420 overall. (explain)

Radeon R9 M390X		160000 MB/sec
GeForce GT 420		28800 MB/sec
	Difference: 131200 (456%)

Texel Rate

The Radeon R9 M390X should be much (about 1553%) faster with regards to anisotropic filtering than the GeForce GT 420. (explain)

Radeon R9 M390X		92544 Mtexels/sec
GeForce GT 420		5600 Mtexels/sec
	Difference: 86944 (1553%)

Pixel Rate

The Radeon R9 M390X will be quite a bit (more or less 726%) faster with regards to AA than the GeForce GT 420, and will be able to handle higher screen resolutions without losing too much performance. (explain)

Radeon R9 M390X		23136 Mpixels/sec
GeForce GT 420		2800 Mpixels/sec
	Difference: 20336 (726%)

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 (in units of MB per second) that can be transported past the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. In the case of DDR type RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the faster the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied in one second. This figure is calculated 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 handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in one second.

Pixel Rate: Pixel rate is the maximum number of pixels the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the card's clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate also depends on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.