Radeon HD 7990 vs Radeon RX Vega 64

Intro

Compare those specs to the Radeon RX Vega 64, which uses a 14 nm design. AMD has set the core speed at 1247 MHz. The HBM2 RAM is set to run at a frequency of 1890 MHz on this particular model. It features 4096 SPUs along with 256 Texture Address Units and 64 ROPs.

Display Graphs

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Benchmarks

These are real-world performance benchmarks that were submitted by Hardware Compare users. The scores seen here are the average of all benchmarks submitted for each respective test and hardware.

3DMark Fire Strike Graphics Score

Radeon RX Vega 64		21986 points
Radeon HD 7990		15520 points
	Difference: 6466 (42%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon RX Vega 64		295 Watts
Radeon HD 7990		375 Watts
	Difference: 80 Watts (27%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 is 16% quicker than the Radeon RX Vega 64 in general, because of its higher data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon RX Vega 64		495411 MB/sec
	Difference: 80589 (16%)

Texel Rate

The Radeon RX Vega 64 is a lot (more or less 31%) faster with regards to anisotropic filtering than the Radeon HD 7990. (explain)

Radeon RX Vega 64		319232 Mtexels/sec
Radeon HD 7990		243200 Mtexels/sec
	Difference: 76032 (31%)

Pixel Rate

The Radeon RX Vega 64 is a lot (about 31%) faster with regards to AA than the Radeon HD 7990, and also will be capable of handling higher screen resolutions without losing too much performance. (explain)

Radeon RX Vega 64		79808 Mpixels/sec
Radeon HD 7990		60800 Mpixels/sec
	Difference: 19008 (31%)

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.

One or more cards in this comparison are multi-core. This means that their bandwidth, texel and pixel rates are theoretically doubled - this does not mean the card will actually perform twice as fast, but only that it should in theory be able to. Actual game benchmarks will give a more accurate idea of what it's capable of.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the max amount of information (measured in MB per second) that can be transferred past 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 RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by ANOTHER 2x. The higher the card's memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that can be applied per second. This number is calculated by multiplying the total texture units of the card by the core clock speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels applied per second.

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