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post #21 of 61

Sigh.....thinking.gif
Quote:
Originally Posted by 2advanced View Post




Crossfire/SLI, by definition, is the use of TWO or more DISCRETE graphics cards in parallel. It's not a difficult concept to understand guys. While I would agree it is essentially the same thing, it is by definition and other things like VRAM, and power consumption, NOT one and the same..................

Edited by 2advanced - 5/29/13 at 6:40pm
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post #22 of 61

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 #23 of 61
@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.
Howerver, that doesn't mean people with Dual-GPU cards will not have the EXACT same issues Crossfire users have. In the particular point, you were wrong, my friend and you gave a bad advice...
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post #24 of 61
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.
Howerver, that doesn't mean people with Dual-GPU cards will not have the EXACT same issues Crossfire users have. In the particular point, you were wrong, my friend and you gave a bad advice...

Unfortunately, I dont base my facts on opinion. Based on initial tests and results, the 7990 does not appears to be having identical issues to 7970's in CF. 7990 appears to be doing worse in some instances and better in others, which would indicate that it has its own problems inherent to the 2x GPU/Single PCB solution. We can quibble all you want about it but these are clearly two entirely different architectures requiring two entirely different solutions.
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post #25 of 61
Quote:
Originally Posted by 2advanced View Post

Unfortunately, I dont base my facts on opinion. Based on initial tests and results, the 7990 does not appears to be having identical issues to 7970's in CF. 7990 appears to be doing worse in some instances and better in others, which would indicate that it has its own problems inherent to the 2x GPU/Single PCB solution. We can quibble all you want about it but these are clearly two entirely different architectures requiring two entirely different solutions.
Wasn't that because they were testing the HD7990 at launch with a Prototype Catalyst driver? The final driver that will -or is said that will -, fix the most significant Crossfire issue is schedule to final June and that will fix not only the Dual-Cards but also the Crossfire and CrossfireX setups.
Again, I agree with you. Different system implementations, indeed.
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post #26 of 61
Quote:
Originally Posted by Johnny Rook View Post

Wasn't that because they were testing the HD7990 at launch with a Prototype Catalyst driver? The final driver that will -or is said that will -, fix the most significant Crossfire issue is schedule to final June and that will fix not only the Dual-Cards but also the Crossfire and CrossfireX setups.
Again, I agree with you. Different system implementations, indeed.

13.6 Beta came out a few days ago and it looks like they've added support for single GPU. Im not sure if they are talking about the 7990 when they say that though...

New profiles added to this release:
- Call of Juarez – Gunslinger – Improves CrossFire performance
- Company of Heroes 2 – Disables CrossFire support
- Far Cry 2 (DX9) – Improves single GPU performance
- Resident Evil 6 – Improves single GPU performance
- Call of Duty 4 – improves single GPU performance
- Dark sider 2 – Fixes the corruption in game menu under certain CrossFire configurations
- Minimum – Improves single GPU performance
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post #27 of 61
Quote:
Originally Posted by 2advanced View Post

13.6 Beta came out a few days ago and it looks like they've added support for single GPU. Im not sure if they are talking about the 7990 when they say that though...

New profiles added to this release:
- Call of Juarez – Gunslinger – Improves CrossFire performance
- Company of Heroes 2 – Disables CrossFire support
- Far Cry 2 (DX9) – Improves single GPU performance
- Resident Evil 6 – Improves single GPU performance
- Call of Duty 4 – improves single GPU performance
- Dark sider 2 – Fixes the corruption in game menu under certain CrossFire configurations
- Minimum – Improves single GPU performance

Facepalm. This is the new CAPs not the new drivers. Also the drivers recognize the 7990 as crossfire. Its the same thing just on the same PCB. Same vrm same chips same everything except performance.
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post #28 of 61
if you get a 7990 to avoid the crossfire issues you are in for a rude awakening, hate to break it to you but its still crossfired
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post #29 of 61
Thread Starter 
ok well I have been really luck with my 7950s as I have had almost no stuttering issues that I can notice anyways. my 7950s are sapphire 7950 hd. and as for the 780 my sponsor tossed in a second to go with it so now i am leaning towards the 780s since i already have a 3d vision setup and 3 3d ready monitors. i will post some of my results once the cards start to arrive. and as for the 7990 i actually started out with that when i updated from my 2 560tis and my stuttering problem was so bad i ended up getting them swaped out for the two 7950s. so those of you who are looking like i was in about a week ill have the cards and ill get some results posted to see what the real difference is since my rig should have no bottle necks for any of these cards.
post #30 of 61
Quote:
Originally Posted by hypnoticx View Post

ok well I have been really luck with my 7950s as I have had almost no stuttering issues that I can notice anyways. my 7950s are sapphire 7950 hd. and as for the 780 my sponsor tossed in a second to go with it so now i am leaning towards the 780s since i already have a 3d vision setup and 3 3d ready monitors. i will post some of my results once the cards start to arrive. and as for the 7990 i actually started out with that when i updated from my 2 560tis and my stuttering problem was so bad i ended up getting them swaped out for the two 7950s. so those of you who are looking like i was in about a week ill have the cards and ill get some results posted to see what the real difference is since my rig should have no bottle necks for any of these cards.

the stuttering on the 560 TIs could be from the vram being limited or if this was a while back, then those stuttering issues were fixed last year - afaik. looking forward to your results.

btw, i did crossfire (7970/7950) just this year and did not experience any stuttering either but i only played bf3, c3, and c2. all smooth and i did not even sync the cards. just let them ran at their own stock settings.
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