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HD 7970 Vapor-X vs HD 7850 X2 crossfire

Last response: in Graphics & Displays
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April 12, 2013 6:19:45 AM

I am thinking of buying either a 7970 or 2 7850's.what would give me better performance?

More about : 7970 vapor 7850 crossfire

April 12, 2013 6:22:11 AM

HD 7850 X2 crossfire will be the strongest performer

amdman599 said:

and I find its actually cheaper to buy 2 7850's rather than 1 7970


Yes, Correct. HD 7850 CF will be faster in raw fps but subject to microstutter issues so a single card is always the best solution.
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April 12, 2013 6:24:37 AM

imomun said:
HD 7850 X2 crossfire will be the strongest performer


and I find its actually cheaper to buy 2 7850's rather than 1 7970
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April 12, 2013 6:32:05 AM

HD 7850 in CF = Slight Better Performance but you'll experience lots of CF issues, so 1 high end card is better than 2 mid-range cards in CF.
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April 12, 2013 6:33:27 AM

Crossfire is badly broken, as FCAT testing has revealed. AMD admits the problem, is working on it, and hopes to have fixes by July.
SLI does not have this problem. Your choice is therefor a pair of GTX650Ti Boost Edition cards, or the single HD7970.
If you have any interest in bitcoin mining, the HD7970 is the only way to go. If it is strictly for games, the two GTX650Ti Boost cards will likely be stronger. Note these must be Boost edition cards, as the vanilla GTX650Ti does not support SLI.
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April 12, 2013 6:40:34 AM

As a rule, you want to get the best single GPU you can for your budget. This way, you can crossfire later (when they correct the microstutter issues with crossfire) and have a better setup than you'd have if you bought the lesser cards now.

Get the 7970.
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April 12, 2013 6:55:00 AM

1 gpu is usually the best option every time. because not all games/aps support xfire/SLi, and the ones which do don't always scale well.

I disagree with the claim 2 650ti Boost will match a 7970... SLi doesn't scale as well as xfire, generally you only get 70% of the 2nd card (vs 90% of an xfire setup)... and while SLi is perferable to xfire (which is buggy as hell) i'd still take a 7970 over any xfire/SLi setup

remember in SLi/xfire the gpus DON'T share Video Ram. So a 1gb 650ti Boost or 1GB or even 2GB 7850 will have more memory bottlenecks then one 7970 (which comes with 3gb of vram)... which means on a big monitor, you'll need the 7970, over any combination of low end gpus with their 1gb of vram.
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April 12, 2013 7:17:51 AM

ingtar33 said:
1 gpu is usually the best option every time. because not all games/aps support xfire/SLi, and the ones which do don't always scale well.

I disagree with the claim 2 650ti Boost will match a 7970... SLi doesn't scale as well as xfire, generally you only get 70% of the 2nd card (vs 90% of an xfire setup)... and while SLi is perferable to xfire (which is buggy as hell) i'd still take a 7970 over any xfire/SLi setup

remember in SLi/xfire the gpus DON'T share Video Ram. So a 1gb 650ti Boost or 1GB or even 2GB 7850 will have more memory bottlenecks then one 7970 (which comes with 3gb of vram)... which means on a big monitor, you'll need the 7970, over any combination of low end gpus with their 1gb of vram.


While I agree the 7970 is the best of the two options for the poster, I disagree that you need more than 2GB of RAM for larger monitors or even resolutions up to 5760x1080. Otherwise we'd be observing better performance out of two 7970 3GB cards in crossfire than two GTX 680 2GB cards in SLI or a single GTX 690 (2GB/GPU):
http://www.tomshardware.com/reviews/geforce-gtx-690-ben...

RAM is temporary storage for the data which can be accessed quickly. RAM size does not equal performance at higher resolutions as exhibited in most reviews with 3GB 7970s in crossfire and 2GB 680s in SLI. When 4K or 8K screens become affordable and the standard, we'll need more RAM on these video cards, but by then we'll all be upgrading to a different gen of video cards.

I do agree you'll see bottlenecks with 1GB cards at resolutions beyond 1080p.
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April 12, 2013 7:33:04 AM

ilysaml said:
HD 7850 in CF = Slight Better Performance but you'll experience lots of CF issues, so 1 high end card is better than 2 mid-range cards in CF.


what glitches/bugs are there exactly? can u send me a link maybe?
thanks
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April 12, 2013 7:45:15 AM

They already told you above. To discover it yourself;
http://www.tomshardware.com/reviews/graphics-card-bench...

In addition to that, CF or SLI scaling isn't that perfect specially with the "Just Released" titles. Frame Latency is another issue too.
Lack of drivers support for CF is a bad habit of AMD too.
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April 12, 2013 8:00:35 AM

What if you already have a 7850? Selling it would be losing a lot of money after fees and shipping.
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April 12, 2013 8:05:25 AM

www.pcper.com probably has the most detailed articles and explanation for a new testing methodology called FCAT. AMD has acknowledged there is a problem, is working on it, and hopes to have fixes by July.
I also agree that one stronger card is the better option.
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September 17, 2013 9:07:25 AM

the OP has most likely made a decision by now, but since this thread isn't closed, I'd thought I'd post my opinion for future readers.

There are plenty of people who have Xfired 7850s that have seen no issue with Microstutter. Microstutter is NOT a given when someone crossfires their cards. It's really a case by case basis. And it is far less prevelent than people make it out to be. There is a thread right in these forums here: http://www.tomshardware.com/forum/395067-33-crossfire-7...

You can clearly see that Xfire 7850s can actually get you in the Titan or 780 range at times with the right rig and OC. His review also gives suggestions on how to clock your cards for better performace. But you will notice the words SMOOTH often in the thread.
I hope to enjoy my 7850 xfire next month. And can post a review as well.

Stay educated and don't let people scare you with talk of experiences they've personally never had.
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