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Radeon HD 7850 vs Radeon HD 7870

Intro

The Radeon HD 7850 comes with a clock speed of 860 MHz and a GDDR5 memory frequency of 1200 MHz. It also uses a 256-bit memory bus, and makes use of a 28 nm design. It is made up of 1024 SPUs, 64 TAUs, and 32 ROPs.

Compare that to the Radeon HD 7870, which uses a 28 nm design. AMD has clocked the core speed at 1000 MHz. The GDDR5 RAM works at a speed of 1200 MHz on this card. It features 1280 SPUs along with 80 TAUs and 32 ROPs.

(No game benchmarks for this combination yet.)

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 the exact same bandwidth, so in theory they should have the same performance. (explain)

Texel Rate

The Radeon HD 7870 is much (about 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 lots of anti-aliasing is important to you, then the Radeon HD 7870 is a better choice, but 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

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

Model Radeon HD 7850 Radeon HD 7870
Manufacturer AMD AMD
Year March 2012 March 2012
Code Name Pitcairn Pro Pitcairn XT
Fab Process 28 nm 28 nm
Bus PCIe 3.0 x16 PCIe 3.0 x16
Memory 2048 MB 2048 MB
Core Speed 860 MHz 1000 MHz
Shader Speed N/A MHz (N/A) MHz
Memory Speed 1200 MHz (4800 MHz effective) 1200 MHz (4800 MHz effective)
Unified Shaders 1024 1280
Texture Mapping Units 64 80
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
DirectX Version DirectX 11.1 DirectX 11.1
OpenGL Version OpenGL 4.2 OpenGL 4.2
Power (Max TDP) 130 watts 175 watts
Shader Model 5.0 5.0
Bandwidth 153600 MB/sec 153600 MB/sec
Texel Rate 55040 Mtexels/sec 80000 Mtexels/sec
Pixel Rate 27520 Mpixels/sec 32000 Mpixels/sec

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

Texel Rate: Texel rate is the maximum amount of texture map elements (texels) that are processed per second. This number is calculated by multiplying the total number 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 a second.

Pixel Rate: Pixel rate is the maximum amount of pixels that the graphics card can possibly write to its local memory per second - measured in millions of pixels per second. The number is worked out by multiplying the amount of colour ROPs by the clock speed of the card. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel output rate also depends on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Comments

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

[...] 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, [...]
[...] 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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