Radeon HD 4650 1GB vs Radeon R9 M390X

Intro

Compare those specifications to the Radeon R9 M390X, which has a core clock frequency of 723 MHz and a GDDR5 memory frequency of 1250 MHz. It also features a 256-bit memory bus, and uses a 28 nm design. It is comprised of 2048 SPUs, 128 TAUs, and 32 ROPs.

Display Graphs

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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

The Radeon R9 M390X, in theory, should perform quite a bit faster than 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 should be quite a bit (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 a high screen resolution is important to you, then the Radeon R9 M390X is a better choice, and very much so. (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: Memory bandwidth is the max amount of data (counted in MB per second) that can be moved past the external memory interface within a second. The number is worked out by multiplying the card's interface width by the speed of its memory. In the case of DDR RAM, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the bandwidth is, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed in one second. This number is worked out by multiplying the total number of texture units by the core speed of the chip. The higher 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 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 the core 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 is also dependant on quite a few other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.