Radeon HD 4650 1GB vs Radeon R7 250

Intro

Compare that to the Radeon R7 250, which comes with clock speeds of 1000 MHz on the GPU, and 1150 MHz on the 1024 MB of GDDR5 memory. It features 384 SPUs as well as 24 TAUs and 8 Rasterization Operator Units.

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

Performance-wise, the Radeon R7 250 should in theory be quite a bit better than the Radeon HD 4650 1GB in general. (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%) better at AF 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 lots of anti-aliasing is important to you, then the Radeon R7 250 is a better choice, by far. (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 max amount of information (in units of MB per second) that can be transported over the external memory interface within a second. It's worked out by multiplying the bus width by its memory clock speed. If it uses DDR type memory, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the bandwidth is, the better 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 can be processed in one second. This is worked out by multiplying the total amount of texture units of the card by the core speed of the chip. The better this number, the better the card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to the local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the number of ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on quite a few other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.