Radeon HD 4650 1GB vs Radeon R7 250X 2GB

Intro

Compare that to the Radeon R7 250X 2GB, which uses a 28 nm design. AMD has set the core frequency at 1000 MHz. The GDDR5 memory runs at a speed of 1125 MHz on this particular card. It features 640 SPUs along with 40 TAUs and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R7 250X 2GB		95 Watts
	Difference: 40 Watts (73%)

Memory Bandwidth

Performance-wise, the Radeon R7 250X 2GB should theoretically be much superior to the Radeon HD 4650 1GB in general. (explain)

Radeon R7 250X 2GB		72000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 49600 (221%)

Texel Rate

The Radeon R7 250X 2GB will be a lot (about 108%) faster with regards to AF than the Radeon HD 4650 1GB. (explain)

Radeon R7 250X 2GB		40000 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 20800 (108%)

Pixel Rate

The Radeon R7 250X 2GB should be a lot (more or less 233%) faster with regards to AA than the Radeon HD 4650 1GB, and will be able to handle higher resolutions better. (explain)

Radeon R7 250X 2GB		16000 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 11200 (233%)

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 over the external memory interface in one second. It's worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher 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 are applied in one second. This number is calculated by multiplying the total number of texture units by the core speed of the chip. The higher the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics chip could possibly record to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of colour ROPs by the the core clock speed. 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 many other factors, most notably the memory bandwidth of the card - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.