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post #31 of 61
Quote:
Originally Posted by 2advanced View Post

Sell the 780, and 1x 7950. Give your bro the other 7950, and buy yourself a 7990 thumb.gif This way, you avoid the scaling issues of SLI, and the Micro-stuttering issues of CF all while having the most powerful, single card solution in existence.

Quote:
Originally Posted by 2advanced View Post

doh.gif

It's called google bro.. AMD CrossFire™: harnesses the power of two or more discrete graphics cards working in parallel to dramatically improve gaming performance

So now that you now that theres nothing "Crossfire" about the 7990, why would you suggest he DOWNGRADE to the 780? His CF 7950 will pimp slap the 780 any day of the week. The 780 is an absolute joke when you consider that it is only marginally better than the 7970GE, which costs $250 LESS.
Not you too...... doh.gif Allow me to correct you...

AMD CrossFire™: harnesses the power of two or more discrete graphics cards working in parallel to dramatically improve gaming performance
OP, are you looking for better performance? If so, the 780 will get its ass handed to it by your CF 7950's. You might as well keep what you have and give the free-bee to your brother. If you are looking for better performance, that 780 would easily sell for $600 here in the marketplace. Thats enough for 2 more 7950's. Tri-Fire for you, single for your bro thumb.gif

How you get a free 780 BTW?

Please tell me you're joking....

The only different thing about dual GPU cards compared to normal crossfire setups is that they communicate through the PLX/NF200 chip instead of the CFX bridge and the PCI-E interface. That's the one and only difference.

Implementation wise dual GPU cards work exactly like crossfire setups do. They absolutely 100% use crossfire to achieve the two GPUs working together. In order for a 7990 to work you need to have CFX enabled as well.

That and they suffer from exactly the same issues and you will get a worse gaming experience on a 7990/7970CFX/7950CFX than you will with a single 780. This has been proven in countless reviews by now. It's hard data and unless you have proof showing otherwise, please do not spread misinformation.
 
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post #32 of 61
Quote:
Originally Posted by Alatar View Post


Please tell me you're joking....

The only different thing about dual GPU cards compared to normal crossfire setups is that they communicate through the PLX/NF200 chip instead of the CFX bridge and the PCI-E interface. That's the one and only difference.

Implementation wise dual GPU cards work exactly like crossfire setups do. They absolutely 100% use crossfire to achieve the two GPUs working together. In order for a 7990 to work you need to have CFX enabled as well.

That and they suffer from exactly the same issues and you will get a worse gaming experience on a 7990/7970CFX/7950CFX than you will with a single 780. This has been proven in countless reviews by now. It's hard data and unless you have proof showing otherwise, please do not spread misinformation.

Oh Alatar, never a dull moment.... If you are correct, then there would be absolutely no need to plug in the second video card into the pci-e slot in crossfire. What about the fact that a 7990 has more available Vram than a pair of 7970's in CF? Power consumption? Like I said before, I agree that is essentially the same thing, just not by definition.

As far as the term "Crossfire," AMD defines it as a two or more discrete video cards working together. Whomever has a problem with that, needs to take it to AMD, not me.

Perhaps you should take the time to read through the thread next time before impulse replying thumb.gif
Quote:
Originally Posted by 2advanced View Post

Google is your friend bro. Here you go, I hope this settles it. You're welcome...

AMD CrossFire™ FAQ
Back
Last Updated
11/26/2012
Article Number
GPU-198
What are the system requirements for AMD CrossFire™?

The minimum requirements to run AMD CrossFire are:

2x or more AMD Radeon™ HD2000 series or greater graphics cards that are within the same family model number. E.g. 2 x AMD Radeon HD6770
AMD CrossFire compatible graphics cards
AMD CrossFire supporting motherboard
At least one AMD CrossFire interconnect bridge for each additional graphics card
Note - Running more than one graphics card on a system may require a higher rated power supply or a power supply that features enough power connections for each graphics card. Please refer to the list of AMD CrossFire certified power supplies.


http://support.amd.com/us/kbarticles/Pages/AMDCrossFireFAQ.aspx

AMD CrossFire™
AMD CrossFire™ technology is the ultimate multi-GPU performance gaming platform. Unlocking game-dominating power, AMD CrossFire™ harnesses the power of two or more discrete graphics cards working in parallel to dramatically improve gaming performance.1 With AMD CrossFire™-certified AMD Radeon™ HD graphics cards ready for practically every budget and the flexibility to combine two, three or four GPUs, AMD CrossFire™ is the perfect multi-GPU solution for those who demand the best.


http://sites.amd.com/us/game/technology/Pages/crossfirex.aspx
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post #33 of 61
amd-radeon7990-gpuz.png

GPU-Z screenshot for a 7990, and what do you know crossfire enabled...shocker


also

"What about the fact that a 7990 has more available Vram than a pair of 7970's in CF?" - It doesnt
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post #34 of 61
Quote:
Originally Posted by 2advanced View Post

Oh Alatar, never a dull moment.... If you are correct, then there would be absolutely no need to plug in the second video card into the pci-e slot in crossfire. What about the fact that a 7990 has more available Vram than a pair of 7970's in CF? Power consumption? Like I said before, I agree that is essentially the same thing, just not by definition.

As far as the term "Crossfire," AMD defines it as a two or more discrete video cards working together. Whomever has a problem with that, needs to take it to AMD, not me.

Perhaps you should take the time to read through the thread next time before impulse replying thumb.gif

vram is mirrored. All dual GPU cards can only use half the amount of the memory they have because they're just crossfire on a stick.

Yes there is a need to connect it to a pci-e slot since the GPU needs to send data somewhere and it needs to communicate with the other GPU. pci-e is the interface for that.

power consumption is lower due to binning, more efficient vrm designs, lower clocks, only one cooler and so on.

Crossfire is AMD's technology for using multiple GPUs to render one game instance. It doesn't have anything to do with the amount of cards, just the amount of GPUs. Everyone here is telling you're wrong, that ought to tell you something.

Do you even have experience of dual GPU cards?
 
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post #35 of 61
The official sentence quoted by 2advanced sums it up. But he keeps not "seeing" it:
Quote:
AMD CrossFire™
AMD CrossFire™ technology is the ultimate multi-GPU performance gaming platform.

So, my 5970 has dual-GPU, hence is multi-GPU, hence is AMD Crossfire.

HD7990 has dual-GPU, hence is multi-GPU, hence is AMD Crossfire.

As far as the "What about the fact that a 7990 has more available Vram than a pair of 7970's in CF?" just shows how really ignorant some users are about how Crossfire works. I WISH my HD5970 REALLY had 2 GB GDDR5, I wouldn't be needing update anytime soon. What my card has REALLY is 1GB + 1GB. Each core uses 1GB only, not 2 GB
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post #36 of 61
If it was me i would sell the GTX780 now for MAX profit.
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post #37 of 61
Quote:
Originally Posted by Johnny Rook View Post

The official sentence quoted by 2advanced sums it up. But he keeps not "seeing" it:
So, my 5970 has dual-GPU, hence is multi-GPU, hence is AMD Crossfire.

HD7990 has dual-GPU, hence is multi-GPU, hence is AMD Crossfire.

As far as the "What about the fact that a 7990 has more available Vram than a pair of 7970's in CF?" just shows how really ignorant some users are about how Crossfire works. I WISH my HD5970 REALLY had 2 GB GDDR5, I wouldn't be needing update anytime soon. What my card has REALLY is 1GB + 1GB. Each core uses 1GB only, not 2 GB

exactly. Would have been nice if my 3870X2s and 4870x2 had twice the usable vram... And same goes for my GTX 590.
 
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post #38 of 61
Quote:
Originally Posted by Alatar View Post

vram is mirrored. All dual GPU cards can only use half the amount of the memory they have because they're just crossfire on a stick.

Yes there is a need to connect it to a pci-e slot since the GPU needs to send data somewhere and it needs to communicate with the other GPU. pci-e is the interface for that.

Earlier you said the ONLY difference was the bridge. I guess part of the perks of being a mod is that you can Ninja Edit without anyone knowing. ph34r-smiley.gif Shame on you for not manning up and admitting your mistake.
Quote:
Originally Posted by Alatar View Post

Crossfire is AMD's technology for using multiple GPUs to render one game instance. It doesn't have anything to do with the amount of cards, just the amount of GPUs.

BRO, I just posted hard facts and in AMD's own words, that it in-fact DOES have to do with the ammount of cards. How is this even a discussion? Does "discrete" mean something different in Finland or something?

dis·crete adjective \dis-ˈkrēt, ˈdis-ˌ\

Definition of DISCRETE

1
: constituting a separate entity : individually distinct

Quote:
Originally Posted by Alatar View Post

Do you even have experience of dual GPU cards?

IMAG0335.jpg

Your point?
Edited by 2advanced - 5/31/13 at 10:06pm
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post #39 of 61
Quote:
Originally Posted by 2advanced View Post

Earlier you said the ONLY difference was the bridge. I guess part of the perks of being a mod is that you can Ninja Edit without anyone knowing. ph34r-smiley.gif Shame on you for not manning up and admitting your mistake.
BRO, I just posted hard facts and in AMD's own words, that it in-fact DOES have to do with the ammount of cards. How is this even a discussion? Does "discrete" mean something different in Finland or something?

dis·crete adjective \dis-ˈkrēt, ˈdis-ˌ\

Definition of DISCRETE

1
: constituting a separate entity : individually distinct


This is exactly why...... Sad to say, but there is no such thing as truth in numbers on OCN
IMAG0335.jpg

Your point?

And the only difference still is the PLX bridge for transfering the data instead of pci-e. I never said anything that would imply otherwise. Memory is mirrored. Just like on dual card CFX setups. On dual GPU cards only half the memory is effectively usable.

And no you posted quotes that you don't understand and tried to argue that it's about cards instead of GPUs. Please just at the very least read the wikipedia article on CFX. AMD does not have another multi GPU tech that they use. Dual GPU cards use crossfire just like two single GPU cards do.

And no, the 7990 does not have 6GB of usable vram. As I said, it's mirrored which means that both GPUs need their own pool of memory and will use it just like single GPU cards in crossfire. 7990 has 3GB effective just like a 7970 CFX setup does.

And I was talking about experience with dual GPU cards. If you haven't owned one don't you think you should take the word of the people who have? You know what the first step is when you plug in an AMD dual GPU card? Enabling CFX in the ccc. No AMD dual GPU card will use both cores without enabling CFX.

I mean cmon, this is basic stuff.... Nvidia dual GPU cards work using SLI and AMD dual GPU cards work using crossfire. Read any review. Any wikipedia article. Anything.
 
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post #40 of 61
Quote:
Originally Posted by Johnny Rook View Post

The official sentence quoted by 2advanced sums it up. But he keeps not "seeing" it:
So, my 5970 has dual-GPU, hence is multi-GPU, hence is AMD Crossfire.

HD7990 has dual-GPU, hence is multi-GPU, hence is AMD Crossfire.

First, why would you stoop as low as to intentionally take something out of context just to try an make a point?

Secondly, why are you even arguing about something that you had already been cleared about...................?
Quote:
Originally Posted by Johnny Rook View Post

@2advanced
Thanks for the input on the GTX 780...
I understand your point of view and yeah, by definition, Crossfire and Dual-GPU card are different things......

Quote:
Originally Posted by Alatar View Post

And I was talking about experience with dual GPU cards. If you haven't owned one don't you think you should take the word of the people who have? You know what the first step is when you plug in an AMD dual GPU card? Enabling CFX in the ccc. No AMD dual GPU card will use both cores without enabling CFX.

I mean cmon, this is basic stuff.... Nvidia dual GPU cards work using SLI and AMD dual GPU cards work using crossfire. Read any review. Any wikipedia article. Anything.

This is bloody exhausting... That picture I posted was my own. Since you're having such a difficult time making sense of things, YES, I DO HAVE CROSSFIRE EXPERIENCE. I have, in the past played around with Crossfire. That picture I posted was of my own Crossfire setup. For the record, Crossfire enabled itself the moment I powered up the PC.

I dont know if you knew this or not, but Wiki is only supposed to be used for informal purposes. The information can be unreliable. Please dont make me explain.

I suggest you take your own advice and READ. I couldnt have made it easier. I even went as far as to post links to my AMD sources.
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