Radeon HD 7990 vs Radeon R9 280X

Intro

Compare all that to the Radeon R9 280X, which has core clock speeds of 850 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 128 TAUs and 32 ROPs.

Display Graphs

Hide Graphs

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 HD 7990		15520 points
Radeon R9 280X		8886 points
	Difference: 6634 (75%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon R9 280X		21 Mh/s
	Difference: 11 (52%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon R9 280X		294 Sol/s
	Difference: 219 (74%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon R9 280X		250 Watts
Radeon HD 7990		375 Watts
	Difference: 125 Watts (50%)

Memory Bandwidth

In theory, the Radeon HD 7990 will be 100% faster than the Radeon R9 280X in general, due to its higher data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon R9 280X		288000 MB/sec
	Difference: 288000 (100%)

Texel Rate

The Radeon HD 7990 should be quite a bit (about 124%) faster with regards to texture filtering than the Radeon R9 280X. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon R9 280X		108800 Mtexels/sec
	Difference: 134400 (124%)

Pixel Rate

If using high levels of AA is important to you, then the Radeon HD 7990 is the winner, by far. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon R9 280X		27200 Mpixels/sec
	Difference: 33600 (124%)

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: Memory bandwidth is the largest amount of data (in units of megabytes per second) that can be moved across the external memory interface in a second. It's calculated by multiplying the interface width by its memory clock speed. If it uses DDR type memory, it should be multiplied by 2 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, HDR and high resolutions.

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