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Radeon HD 7850 vs Radeon HD 7870

Intro

The Radeon HD 7850 has a GPU clock speed of 860 MHz, and the 2048 MB of GDDR5 RAM is set to run at 1200 MHz through a 256-bit bus. It also is comprised of 1024 SPUs, 64 TAUs, and 32 ROPs.

Compare that to the Radeon HD 7870, which features a GPU core clock speed of 1000 MHz, and 2048 MB of GDDR5 RAM running at 1200 MHz through a 256-bit bus. It also is made up of 1280 Stream Processors, 80 Texture Address Units, and 32 Raster Operation Units.

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 7870 175 Watts
Difference: 45 Watts (35%)

Memory Bandwidth

Both cards have exactly the same memory bandwidth, so in theory they should have identical performance. (explain)

Texel Rate

The Radeon HD 7870 will be a lot (more or less 45%) better at anisotropic filtering than the Radeon HD 7850. (explain)

Radeon HD 7870 80000 Mtexels/sec
Radeon HD 7850 55040 Mtexels/sec
Difference: 24960 (45%)

Pixel Rate

If using a high resolution is important to you, then the Radeon HD 7870 is superior to the Radeon HD 7850, though not by far. (explain)

Radeon HD 7870 32000 Mpixels/sec
Radeon HD 7850 27520 Mpixels/sec
Difference: 4480 (16%)

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

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Radeon HD 7850

Amazon.com

Radeon HD 7870

Amazon.com

Please note that the price comparisons are based on search keywords - sometimes it might show cards with very similar names that are not exactly the same as the one chosen in the comparison. We do try to filter out the wrong results as best we can, though.

Specifications

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Model Radeon HD 7850 Radeon HD 7870
Manufacturer AMD AMD
Year March 2012 March 2012
Code Name Pitcairn Pro Pitcairn XT
Memory 2048 MB 2048 MB
Core Speed 860 MHz 1000 MHz
Memory Speed 4800 MHz 4800 MHz
Power (Max TDP) 130 watts 175 watts
Bandwidth 153600 MB/sec 153600 MB/sec
Texel Rate 55040 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 32000 Mpixels/sec
Unified Shaders 1024 1280
Texture Mapping Units 64 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 28 nm 28 nm
Transistors 2800 million 2800 million
Bus PCIe 3.0 x16 PCIe 3.0 x16
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of information (measured in MB per second) that can be transferred past the external memory interface within a second. It's calculated by multiplying the card's bus width by its memory speed. In the case of DDR type memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by 4 instead. The higher the memory bandwidth, the better the card will be in general. It especially helps with AA, High Dynamic Range and high resolutions.

Texel Rate: Texel rate is the maximum texture map elements (texels) that are applied per second. This is calculated by multiplying the total amount of texture units of the card by the core clock speed of the chip. The better the texel rate, the better the video card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels in one second.

Pixel Rate: Pixel rate is the maximum number of pixels that the graphics chip can possibly write to the local memory in a second - measured in millions of pixels per second. Pixel rate is calculated by multiplying the number of Render Output Units by the the core clock speed. ROPs (Raster Operations Pipelines - also called Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth - the lower the memory bandwidth is, the lower the potential to get to the max fill rate.

Comments

5 Responses to “Radeon HD 7850 vs Radeon HD 7870”
Neuen PC/ Laptop - Seite 65 - Das Diablo-3.net Forum - Das beste deutsche Diablo 3 Forum says:

[...] Radeon HD 7850 vs Radeon HD 7870 – Performance Comparison Benchmarks @ Hardware Compare __________________ "Alle Menschen haben Recht, ZUMINDEST GLAUBEN SIE DAS!" (Albert Einstein) [...]

Upgrading from AMD 4870 to 7850 GFX says:

[...] Originally Posted by colinquek An update, i go t the ASUS 7850. Good card, and did some perfmon test on my pc, other than FPS increased, nothing else pretty much changed. Which is a good thing. Thanks all the bros for your advice. If you were a lil earlier, many were dumping 6970 for as cheap as 400 bucks. (Non-ref) Radeon HD 7850 vs Radeon HD 7870 – Performance Comparison Benchmarks @ Hardware Compare [...]

Awais says:

hello, i wanted to ask that would it be wise to get an hd7870 instead of 7850. i work in different 3d creation softwares.

thank you

Gamer PC mit Windows und Zusammenbau 900€ - netzwelt.de Forum says:

[...] okay aber wie gesagt wäre die 7870 besser. Hier einmal ein kleiner Vergleich der 7850 mit der 7870 Vergleich 7850 mit 7870 Das Mainboard ist auch noch okay, allerdings kann man damit zwar kein SLI/Crossfire betreiben, [...]

Suche passende Grafikkarte - netzwelt.de Forum says:

[...] jedoch finde ich das die ca. 40-50€ für die 7870 es mehr als wert sind. Gruß Junatic PS: Vergleich 7850 mit 7870 2048MB Sapphire Radeon HD 7850 2048MB XFX Radeon HD 7850 Core Edition mit Doppellüfter 1024MB XFX [...]

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