Radeon HD 4670 1GB vs Radeon R9 390X 8G

Intro

Compare all of that to the Radeon R9 390X 8G, which comes with GPU clock speed of 1050 MHz, and 8192 MB of GDDR5 memory set to run at 1500 MHz through a 512-bit bus. It also features 2816 Stream Processors, 176 TAUs, and 64 ROPs.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4670 1GB		70 Watts
Radeon R9 390X 8G		275 Watts
	Difference: 205 Watts (293%)

Memory Bandwidth

The Radeon R9 390X 8G, in theory, should perform a lot faster than the Radeon HD 4670 1GB in general. (explain)

Radeon R9 390X 8G		384000 MB/sec
Radeon HD 4670 1GB		35200 MB/sec
	Difference: 348800 (991%)

Texel Rate

The Radeon R9 390X 8G is a lot (more or less 670%) more effective at anisotropic filtering than the Radeon HD 4670 1GB. (explain)

Radeon R9 390X 8G		184800 Mtexels/sec
Radeon HD 4670 1GB		24000 Mtexels/sec
	Difference: 160800 (670%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon R9 390X 8G is superior to the Radeon HD 4670 1GB, by a large margin. (explain)

Radeon R9 390X 8G		67200 Mpixels/sec
Radeon HD 4670 1GB		6000 Mpixels/sec
	Difference: 61200 (1020%)

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: Memory bandwidth is the maximum amount of information (measured in megabytes per second) that can be transferred across the external memory interface in one second. The number is worked out by multiplying the card's bus width by its memory clock speed. If the card has DDR type memory, the result should be multiplied by 2 once again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that can be applied in one second. This figure is worked out by multiplying the total texture units by the core speed of the chip. The higher the texel rate, the better the graphics 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 maximum amount of pixels that the graphics chip can possibly write to the local memory in one second - measured in millions of pixels per second. The number is worked out by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also sometimes called Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel fill rate is also dependant on many other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to get to the maximum fill rate.