Radeon HD 7790 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which comes with core clock speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs along with 128 Texture Address Units 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 HD 7790		4330 points
	Difference: 11190 (258%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7790		85 Watts
Radeon HD 7990		375 Watts
	Difference: 290 Watts (341%)

Memory Bandwidth

Theoretically speaking, the Radeon HD 7990 should be 500% quicker than the Radeon HD 7790 in general, because of its greater data rate. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 7790		96000 MB/sec
	Difference: 480000 (500%)

Texel Rate

The Radeon HD 7990 is quite a bit (approximately 334%) faster with regards to AF than the Radeon HD 7790. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 7790		56000 Mtexels/sec
	Difference: 187200 (334%)

Pixel Rate

The Radeon HD 7990 should be much (approximately 280%) more effective at full screen anti-aliasing than the Radeon HD 7790, and also able to handle higher screen resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 7790		16000 Mpixels/sec
	Difference: 44800 (280%)

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 data (in units of MB per second) that can be transported past the external memory interface in one second. The number is calculated by multiplying the card's interface width by its memory clock speed. In the case of DDR RAM, it should be multiplied by 2 again. If DDR5, multiply by ANOTHER 2x. The better the memory bandwidth, the faster the card will be in general. It especially helps with anti-aliasing, HDR and high resolutions.

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that can be processed in one second. This figure is calculated by multiplying the total texture units of the card by the core speed of the chip. The higher this number, the better the video card will be at handling 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 that the graphics chip could possibly write to the local memory in a second - measured in millions of pixels per second. The figure is worked out by multiplying the number of Raster Operations Pipelines by the clock 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 rate also depends on quite a few other factors, especially the memory bandwidth - the lower the memory bandwidth is, the lower the ability to reach the max fill rate.