Radeon HD 7990 vs Radeon RX Vega 64

Intro

Compare those specs to the Radeon RX Vega 64, which comes with core speeds of 1247 MHz on the GPU, and 1890 MHz on the 8192 MB of HBM2 memory. It features 4096 SPUs as well as 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

The Radeon HD 7990 should theoretically be a bit faster than the Radeon RX Vega 64 overall. (explain)

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

Texel Rate

The Radeon RX Vega 64 should be much (about 31%) faster with regards to texture 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 will be quite a bit (more or less 31%) better at FSAA than the Radeon HD 7990, and also will be able to handle higher 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 maximum amount of data (counted in megabytes per second) that can be moved past the external memory interface in a second. The number is worked out by multiplying the card's interface width by its memory speed. If it uses DDR type RAM, the result should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The higher 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 amount of texture map elements (texels) that are processed per second. This is worked out by multiplying the total number of texture units by the core clock speed of the chip. The higher the texel rate, the better the video 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 number of pixels the graphics card could possibly write to its local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the the core 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 is also dependant on lots of other factors, especially the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.