GeForce GTX 650 vs Radeon HD 7990

Intro

Compare all of that to the Radeon HD 7990, which comes with a core clock speed of 950 MHz and a GDDR5 memory speed of 1500 MHz. It also uses a 384-bit bus, and makes use of a 28 nm design. It is made up of 2048 SPUs, 128 Texture Address Units, and 32 Raster Operation Units.

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
GeForce GTX 650		2263 points
	Difference: 13257 (586%)

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650		64 Watts
Radeon HD 7990		375 Watts
	Difference: 311 Watts (486%)

Memory Bandwidth

In theory, the Radeon HD 7990 should perform much faster than the GeForce GTX 650 in general. (explain)

Radeon HD 7990		576000 MB/sec
GeForce GTX 650		80000 MB/sec
	Difference: 496000 (620%)

Texel Rate

The Radeon HD 7990 should be a lot (more or less 618%) faster with regards to AF than the GeForce GTX 650. (explain)

Radeon HD 7990		243200 Mtexels/sec
GeForce GTX 650		33856 Mtexels/sec
	Difference: 209344 (618%)

Pixel Rate

If running with a high resolution is important to you, then the Radeon HD 7990 is superior to the GeForce GTX 650, and very much so. (explain)

Radeon HD 7990		60800 Mpixels/sec
GeForce GTX 650		16928 Mpixels/sec
	Difference: 43872 (259%)

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 largest amount of data (in units of MB per second) that can be transferred past the external memory interface within a second. It is worked out by multiplying the card's interface width by the speed of its memory. If the card has DDR type RAM, it must be multiplied by 2 once again. If it uses DDR5, multiply by 4 instead. The better the bandwidth is, the faster the card will be in general. It especially helps with AA, HDR and higher screen resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are processed per second. This number is worked out by multiplying the total number of texture units of the card by the core 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 applied in a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card could possibly write to its local memory per 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 filling the screen with pixels (the image). The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to reach the maximum fill rate.