Radeon HD 4650 1GB vs Radeon R9 380 4G

Intro

Compare those specifications to the Radeon R9 380 4G, which has a core clock frequency of 970 MHz and a GDDR5 memory speed of 1425 MHz. It also makes use of a 256-bit bus, and makes use of a 28 nm design. It features 1792 SPUs, 112 Texture Address Units, 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 380 4G		190 Watts
	Difference: 135 Watts (245%)

Memory Bandwidth

Theoretically speaking, the Radeon R9 380 4G should be much faster than the Radeon HD 4650 1GB overall. (explain)

Radeon R9 380 4G		182400 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 160000 (714%)

Texel Rate

The Radeon R9 380 4G is quite a bit (about 466%) faster with regards to AF than the Radeon HD 4650 1GB. (explain)

Radeon R9 380 4G		108640 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 89440 (466%)

Pixel Rate

If running with high levels of AA is important to you, then the Radeon R9 380 4G is superior to the Radeon HD 4650 1GB, by a large margin. (explain)

Radeon R9 380 4G		31040 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 26240 (547%)

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 data (counted in MB per second) that can be transported across the external memory interface in one second. The number is worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied 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 the texel rate, the better the graphics card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels per second.

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