7970 v 7770 crossfire v 6870x2

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AlienIsGOD


i dont care what some website says, 1280 shaders does NOT come close to 2048. Also a 6990 has 2 x 1536 shaders whereas a 6870X2 has 2 x 1120. A 7850/70 crossfire config will come close to or beat a 7970 but NOT 7770 crossfire.
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MC_K7

MC_K7

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I would go for a single 7970.

I'm not a huge fan of Crossfire or SLI due to added complexity of running two cards at the same time: consumes more power (need beefier PSU), generates more heat inside the case, less stable drivers, some games not well optimized for it, etc... And note that the 6870x2 you were also looking at is basically Crossfire on the same card, so it consumes a lot more power and will run really really hot and therefore will be more noisy too.

 
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AlienIsGOD

AlienIsGOD

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um no. 7770 has 640 shaders, multiply that x 2 and you get 1280; the same number a 7870 has for shaders. So 7770 crossfire is more like single 7850/70 territory at best. As for the 6870X2, it COULD have more brute power, but the crossfire issues and the fact its 2 GPUs on a single card present more issues ie. overheating and stuttering.

A 7970 would be more than suffice and being the newer series, it should have better driver support as I havent seen anything in catalyst release notes about improvements other than on HD7000 series cards
 
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Mi7agent1

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Motherboards.org show the 7770 crossfire setup to be on par with a 7950 and alot of peepz say the 6870x2 is bassically a 6990 which isnt a bad card tbh so from this info thats why im wondering which is the best choice ?
 
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MC_K7

MC_K7

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It's not a matter of raw performance, because the 3 options are somewhat close. As said by AlienIsGod it becomes a matter of potential issues with multiple card setups, so I suggest to avoid it if possible.

Go read my first reply too.

The 7970 is the easiest and most "elegant" solution for you. Plain and simple.
 
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AlienIsGOD

AlienIsGOD

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i dont care what some website says, 1280 shaders does NOT come close to 2048. Also a 6990 has 2 x 1536 shaders whereas a 6870X2 has 2 x 1120. A 7850/70 crossfire config will come close to or beat a 7970 but NOT 7770 crossfire.
 
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MC_K7

MC_K7

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Trying to save money is one thing, but if you run into problems or inconveniences after, you might regret not spending just a little more.

How much is the 7950 selling in the UK?

7870 XT (Tahiti core) is a good option too.
 
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AlienIsGOD

AlienIsGOD

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im telling you, 2 7770's wont give you any kind of desired performance. 1GB @ 128bit bus vs 2GB @ 256bit bus on the 7800 and 7900. 7770s shouldnt even be a consideration against a single 7870 XT or 7950. Saving money is one thing, but spending foolishly is another....
 
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iam2thecrowe

iam2thecrowe

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even if the dual card options were as powerful as a single 7970, you get all the problems of dual amd cards, like stuttering and frame time varience, along with the lack of vram compared to a 3gb 7970. I agree with alienisgod, I would take a single 7870 over dual 7770's regardless of what any benchmark results would show. AMD's drivers are improved for dual card configs with the new driver, but at a cost of reduced performance scaling and still doesn't fix the stuttering across all resolutions and setups. Don't touch crossfire until amd finally gets a hardware fix for its problems as NVidia has done with its sli. Or maybe just consider a couple NVidia 650ti boosts for an inexpensive dual card setup that performs well (although I would still get a better single card first leaving room for upgrade later.)
 
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