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Radeon HD 5850 vs Radeon HD 7850

Intro

The Radeon HD 5850 comes with a GPU core clock speed of 725 MHz, and the 1024 MB of GDDR5 RAM runs at 1000 MHz through a 256-bit bus. It also is comprised of 1440(288x5) Stream Processors, 72 Texture Address Units, and 32 ROPs.

Compare all that to the Radeon HD 7850, which makes use of a 28 nm design. AMD has clocked the core frequency at 860 MHz. The GDDR5 RAM runs at a frequency of 1200 MHz on this specific model. It features 1024 SPUs along with 64 TAUs and 32 ROPs.

Display Graphs

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Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 7850 130 Watts
Radeon HD 5850 151 Watts
Difference: 21 Watts (16%)

Memory Bandwidth

In theory, the Radeon HD 7850 will be 20% quicker than the Radeon HD 5850 overall, because of its greater data rate. (explain)

Radeon HD 7850 153600 MB/sec
Radeon HD 5850 128000 MB/sec
Difference: 25600 (20%)

Texel Rate

The Radeon HD 7850 should be a small bit (more or less 5%) better at AF than the Radeon HD 5850. (explain)

Radeon HD 7850 55040 Mtexels/sec
Radeon HD 5850 52200 Mtexels/sec
Difference: 2840 (5%)

Pixel Rate

The Radeon HD 7850 will be just a bit (approximately 19%) better at anti-aliasing than the Radeon HD 5850, and able to handle higher screen resolutions without losing too much performance. (explain)

Radeon HD 7850 27520 Mpixels/sec
Radeon HD 5850 23200 Mpixels/sec
Difference: 4320 (19%)

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 5850

Radeon HD 7850

Specifications

Display Specifications

Hide Specifications

Model Radeon HD 5850 Radeon HD 7850
Manufacturer AMD AMD
Year September 30, 2009 March 2012
Code Name Cypress PRO Pitcairn Pro
Memory 1024 MB 2048 MB
Core Speed 725 MHz 860 MHz
Memory Speed 4000 MHz 4800 MHz
Power (Max TDP) 151 watts 130 watts
Bandwidth 128000 MB/sec 153600 MB/sec
Texel Rate 52200 Mtexels/sec 55040 Mtexels/sec
Pixel Rate 23200 Mpixels/sec 27520 Mpixels/sec
Unified Shaders 1440(288x5) 1024
Texture Mapping Units 72 64
Render Output Units 32 32
Bus Type GDDR5 GDDR5
Bus Width 256-bit 256-bit
Fab Process 40 nm 28 nm
Transistors 2154 million 2800 million
Bus PCIe 2.1 x16 PCIe 3.0 x16
DirectX Version DirectX 11 DirectX 11.1
OpenGL Version OpenGL 3.2 OpenGL 4.2

Memory Bandwidth: Memory bandwidth is the maximum amount of data (counted in megabytes per second) that can be transported past the external memory interface in a second. It is calculated by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If it uses DDR5, multiply by ANOTHER 2x. The better the card's memory bandwidth, the better the card will be in general. It especially helps with AA, HDR and high resolutions.

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

Pixel Rate: Pixel rate is the most pixels that the graphics card could possibly write to its local memory in one second - measured in millions of pixels per second. The figure is calculated by multiplying the amount of colour ROPs by the the core clock speed. ROPs (Raster Operations Pipelines - aka Render Output Units) are responsible for drawing the pixels (image) on the screen. The actual pixel rate is also dependant on quite a few other factors, most notably the memory bandwidth - the lower the bandwidth is, the lower the ability to get to the maximum fill rate.

Radeon HD 5850

Radeon HD 7850

Comments

3 Responses to “Radeon HD 5850 vs Radeon HD 7850”
GPU Upgrade - Need Suggestions! says:

[...] better performer as well as a better overclocker (if you overclock ofcourse). Check out this link- Radeon HD 5850 vs Radeon HD 7850 – Performance Comparison Benchmarks @ Hardware Compare Please note that it is completely theoretical and the real world performance may differ. Also [...]

Terrence says:

Hey Im looking at possibly upgrading my video card in couple of months.
I currently have radeon hd 5850 and was wondering whats the main difference when cards say core speed and memory speed?
I see cheaper cards on the market have the same core speed but are DDR2 instead of 3.

larsV12 says:

@Terrence .. core (clock) speed like any of the other measures of performance in gfx cards is all relative. You mention lesser cards having "the same core speed" .. and that's actually incorrect across each generation iteration of DDR & GDDR vRAM types. That's to say, a gfx card with 1GB of DDR2 vRAM will essentially perform no better than a card with 512MB's of GDDR3 vRAM. You see, the premise being that each generation of DDR roughly doubles the speed of the generation before. So, put another way, 1 GB of GDDR3 will perform at only half the speed of 1 GB of GDDR5. So, it's like this, DDR2 & DDR3?? Forget it .. they're yesterday's tech' - and a complete waste of time even thinking about (let alone discussing). If you're after a budget upgrade in the RED corner, i'd advise a HD6950 2GB - or better still a 6970, at the very least. If you're looking at the GREEN team, consider at least a GTX 480 or GTX 580. As all of those cards are getting relatively old now (but each still supporting DX 11 & all having GDDR5 vRAM), you should be able to pick up a bargain from either the GREEN or RED Team on any one of those cards i've named ;)

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