Radeon HD 4650 1GB vs Radeon R9 M375X

Intro

Compare all of that to the Radeon R9 M375X, which comes with core speeds of 1015 MHz on the GPU, and 1125 MHz on the 4096 MB of GDDR5 RAM. It features 640 SPUs along with 40 Texture Address Units and 16 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Memory Bandwidth

In theory, the Radeon R9 M375X will be 221% quicker than the Radeon HD 4650 1GB overall, due to its greater bandwidth. (explain)

Radeon R9 M375X		72000 MB/sec
Radeon HD 4650 1GB		22400 MB/sec
	Difference: 49600 (221%)

Texel Rate

The Radeon R9 M375X should be much (approximately 111%) more effective at AF than the Radeon HD 4650 1GB. (explain)

Radeon R9 M375X		40600 Mtexels/sec
Radeon HD 4650 1GB		19200 Mtexels/sec
	Difference: 21400 (111%)

Pixel Rate

The Radeon R9 M375X should be a lot (about 238%) better at full screen anti-aliasing than the Radeon HD 4650 1GB, and also capable of handling higher resolutions better. (explain)

Radeon R9 M375X		16240 Mpixels/sec
Radeon HD 4650 1GB		4800 Mpixels/sec
	Difference: 11440 (238%)

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 data (measured in megabytes per second) that can be moved across the external memory interface in one second. It's worked out by multiplying the card's bus width by the speed of its memory. If the card has DDR type RAM, the result should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be applied per second. This number is worked out by multiplying the total amount of texture units of the card by the core clock 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 in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly record to its local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of colour ROPs by the the core speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel output rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.