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GeForce GTX 650 vs Radeon HD 5870

Intro

The GeForce GTX 650 makes use of a 28 nm design. nVidia has clocked the core speed at 1058 MHz. The GDDR5 RAM works at a speed of 1250 MHz on this card. It features 384 SPUs as well as 32 Texture Address Units and 16 ROPs.

Compare those specs to the Radeon HD 5870, which makes use of a 40 nm design. AMD has clocked the core frequency at 850 MHz. The GDDR5 RAM is set to run at a speed of 1200 MHz on this particular model. It features 1600(320x5) SPUs along with 80 TAUs and 32 Rasterization Operator Units.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

GeForce GTX 650 64 Watts
Radeon HD 5870 188 Watts
Difference: 124 Watts (194%)

Memory Bandwidth

The Radeon HD 5870 should theoretically perform quite a bit faster than the GeForce GTX 650 overall. (explain)

Radeon HD 5870 153600 MB/sec
GeForce GTX 650 80000 MB/sec
Difference: 73600 (92%)

Texel Rate

The Radeon HD 5870 is quite a bit (approximately 101%) better at AF than the GeForce GTX 650. (explain)

Radeon HD 5870 68000 Mtexels/sec
GeForce GTX 650 33856 Mtexels/sec
Difference: 34144 (101%)

Pixel Rate

If using a high screen resolution is important to you, then the Radeon HD 5870 is the winner, and very much so. (explain)

Radeon HD 5870 27200 Mpixels/sec
GeForce GTX 650 16928 Mpixels/sec
Difference: 10272 (61%)

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.

Price Comparison

GeForce GTX 650

Radeon HD 5870

Specifications

Display Specifications

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Model GeForce GTX 650 Radeon HD 5870
Manufacturer nVidia AMD
Year September 2012 September 23, 2009
Code Name GK107 Cypress XT
Memory 1024 MB 1024 MB
Core Speed 1058 MHz 850 MHz
Memory Speed 5000 MHz 4800 MHz
Power (Max TDP) 64 watts 188 watts
Bandwidth 80000 MB/sec 153600 MB/sec
Texel Rate 33856 Mtexels/sec 68000 Mtexels/sec
Pixel Rate 16928 Mpixels/sec 27200 Mpixels/sec
Unified Shaders 384 1600(320x5)
Texture Mapping Units 32 80
Render Output Units 16 32
Bus Type GDDR5 GDDR5
Bus Width 128-bit 256-bit
Fab Process 28 nm 40 nm
Transistors 1300 million 2154 million
Bus PCIe 3.0 x16 PCIe 2.1 x16
DirectX Version DirectX 11.0 DirectX 11
OpenGL Version OpenGL 4.3 OpenGL 3.2

Memory Bandwidth: Memory bandwidth is the max amount of information (counted in MB per second) that can be moved over the external memory interface in a second. The number is worked out by multiplying the bus width by its memory speed. If the card has DDR memory, it should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the card's memory bandwidth, 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 can be processed in one second. This figure is worked out by multiplying the total number of texture units of the card by the core speed of the chip. The better the texel rate, the better the graphics 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 its local memory in one second - measured in millions of pixels per second. The figure is worked out by multiplying the number of ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for filling the screen with pixels (the image). The actual pixel rate also depends on lots of other factors, especially the memory bandwidth of the card - the lower the memory bandwidth is, the lower the potential to get to the maximum fill rate.

GeForce GTX 650

Radeon HD 5870

Comments

2 Responses to “GeForce GTX 650 vs Radeon HD 5870”
Søren says:

Why is your GTX 650 listed as having 2048mb GDDR5 rams when it only has 1024? that makes no sense to me and this is the only place i've found that suggesd this.

MikEms says:

You are correct, slight oversight, will be fixed.
There actually are 2GB versions available.
http://www.gainward.com/main/vgapro.php?id=894&lang=en
https://www.amazon.com/PNY-GeForce-GTX650-VCGGTX650XPB-Graphic/dp/B009T0FDR2

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