Radeon HD 4650 1GB vs Radeon R9 M390X

Intro

Compare all that to the Radeon R9 M390X, which uses a 28 nm design. AMD has clocked the core frequency at 723 MHz. The GDDR5 RAM runs at a frequency of 1250 MHz on this specific model. It features 2048 SPUs as well as 128 Texture Address Units and 32 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R9 M390X		125 Watts
	Difference: 70 Watts (127%)

Memory Bandwidth

As far as performance goes, the Radeon R9 M390X should theoretically be a lot superior to the Radeon HD 4650 1GB in general. (explain)

Radeon R9 M390X		160000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 137600 (614%)

Texel Rate

The Radeon R9 M390X is a lot (approximately 382%) more effective at AF than the Radeon HD 4650 1GB. (explain)

Radeon R9 M390X		92544 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 73344 (382%)

Pixel Rate

If using lots of anti-aliasing is important to you, then the Radeon R9 M390X is superior to the Radeon HD 4650 1GB, by a large margin. (explain)

Radeon R9 M390X		23136 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 18336 (382%)

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 (measured in MB per second) that can be transferred past the external memory interface in one second. It is worked out by multiplying the bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are processed in one second. This number 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 texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the amount of colour ROPs by the clock speed of the card. 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 is also dependant on quite a few 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.