Radeon HD 4650 1GB vs Radeon R7 250

Intro

Compare those specs to the Radeon R7 250, which makes use of a 28 nm design. AMD has clocked the core frequency at 1000 MHz. The GDDR5 RAM is set to run at a speed of 1150 MHz on this particular model. It features 384 SPUs as well as 24 Texture Address Units and 8 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 1GB		55 Watts
Radeon R7 250		65 Watts
	Difference: 10 Watts (18%)

Memory Bandwidth

Theoretically speaking, the Radeon R7 250 is 229% quicker than the Radeon HD 4650 1GB in general, because of its higher bandwidth. (explain)

Radeon R7 250		73600 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 51200 (229%)

Texel Rate

The Radeon R7 250 should be quite a bit (more or less 25%) faster with regards to anisotropic filtering than the Radeon HD 4650 1GB. (explain)

Radeon R7 250		24000 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 4800 (25%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon R7 250 is the winner, by a large margin. (explain)

Radeon R7 250		8000 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 3200 (67%)

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 maximum amount of information (counted in MB per second) that can be transported past the external memory interface in a second. It's calculated by multiplying the card's interface width by the speed of its memory. If the card has DDR memory, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are applied in one second. This figure is calculated by multiplying the total amount of texture units by the core clock speed of the chip. The better the texel rate, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the most pixels that the graphics card can possibly record to the local memory in a second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on many other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the max fill rate.