Radeon HD 7850 vs Radeon HD 7990

Intro

Compare those specifications to the Radeon HD 7990, which features core speeds of 950 MHz on the GPU, and 1500 MHz on the 3072 MB of GDDR5 memory. It features 2048 SPUs as well as 128 TAUs and 32 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 HD 7990		15520 points
Radeon HD 7850		5200 points
	Difference: 10320 (198%)

Zcash Mining Hash Rate

Radeon HD 7990		513 Sol/s
Radeon HD 7850		171 Sol/s
	Difference: 342 (200%)

Ethereum Mining Hash Rate

Radeon HD 7990		32 Mh/s
Radeon HD 7850		13 Mh/s
	Difference: 19 (146%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850		130 Watts
Radeon HD 7990		375 Watts
	Difference: 245 Watts (188%)

Memory Bandwidth

In theory, the Radeon HD 7990 should be much faster than the Radeon HD 7850 in general. (explain)

Radeon HD 7990		576000 MB/sec
Radeon HD 7850		153600 MB/sec
	Difference: 422400 (275%)

Texel Rate

The Radeon HD 7990 should be quite a bit (more or less 342%) faster with regards to AF than the Radeon HD 7850. (explain)

Radeon HD 7990		243200 Mtexels/sec
Radeon HD 7850		55040 Mtexels/sec
	Difference: 188160 (342%)

Pixel Rate

The Radeon HD 7990 should be quite a bit (approximately 121%) more effective at FSAA than the Radeon HD 7850, and also will be able to handle higher resolutions better. (explain)

Radeon HD 7990		60800 Mpixels/sec
Radeon HD 7850		27520 Mpixels/sec
	Difference: 33280 (121%)

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 information (in units of megabytes per second) that can be moved past the external memory interface within a second. The number is calculated by multiplying the interface width by the speed of its memory. In the case of DDR type RAM, it should be multiplied by 2 once again. If DDR5, multiply by ANOTHER 2x. The higher the card's 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 are processed in one second. This number 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 card will be at texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum amount of pixels the video card could possibly record to the local memory in a second - measured in millions of pixels per second. The number is worked out by multiplying the amount of ROPs 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 also depends on quite a few other factors, especially the memory bandwidth - the lower the bandwidth is, the lower the potential to get to the maximum fill rate.