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Dual crossfire 6990 power consumption ?

Last response: in Graphics & Displays
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January 20, 2012 5:03:57 AM

Hi ! i have a few questions for you guys please help!

i actually have a gaming computer wich is working really great ! but i would like in the future add another ati radeon HD 6990 but.... do im gonna have power enough to run it ? does my cpu is going to bottleneck it ? my rams are ok ?

here are my specs:

CPU: intel core 2 extreme 3ghz overclocked at 4ghz
mobo: asus p5e3 deluxe crossfire ready 2X pciexpress 2.0
rams: 4x2 gb= 8gb DDR3 1333mhz
psu: antec truepower quattro 1200 watt 80 plus certified
graphic card: XFX radeon HD 6990

so does it gonna work great with another 6990 ?
or im not gonna have power enough to run these 2 6990 ?
on the AMD web site they said that we need 1200 watt 80 certified power supply to get maximum performance but i doubt cause of my overclocked cpu that is actually takes a lot of power (1.52 volts)...hope its gonna be alright.... i dont wanna buy another poweer supply these are so expensive
a c 92 U Graphics card
January 20, 2012 5:06:40 AM

2 6990s are not very good for performance scaling.

thats basically 4 cards running crossfire and often have a lot of issues.

your cpu and psu is fine tho, the 2 cards will still stay well below the 1200 watts it has.
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a c 358 U Graphics card
January 20, 2012 6:16:04 AM

A single HD 6990 uses nearly 400w of power. In a worse case scenario that means two HD 6990 XFired will use about 800w of power. However, since different games scales differently with multiple cards it is difficult to know what the actual power consumption will be.

In the case where you play a game that cannot make use of XFire, then the second card will likely be idling and consume about 50W of power.



http://www.xbitlabs.com/articles/graphics/display/radeo...
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a b U Graphics card
January 20, 2012 7:39:39 AM

I run 2x 5970's which are less effecient then the 6990's and with a I7 3930K and running a 900w PSU with power meter on the system and the line i have never pulled more then 830w from the wall under stress testing and way less under games. mainly cause Quad Crossfire is not utllized very well

So with that 1200 PSU you have heaps and heaps of room
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a b U Graphics card
January 20, 2012 8:46:16 AM

Quadfire is a terrible investment dude, you'll only see performance in benchmarks, it will NOT translate to the vast majority of games, look around the net for quadfire reviews, I really couldn't recommend against it more.
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a b U Graphics card
January 20, 2012 8:49:03 AM

no need to add another 6990, be happy with one it's more than enough vram if you want to add another then you always be facing a heatness problem cause 6990 is pretty big and the second one will block the first card air flow, as a result RMA chances increases and don't you know the scaling of 2 6990 is really bad in performance also your cpu will bottleneck both the cards a little.
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a b U Graphics card
January 20, 2012 9:56:01 AM

Joedjnpc i couldn't agree more after running it myself i won't ever go back to Quad its just not worth it for gaming
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a b U Graphics card
January 23, 2012 8:30:20 PM

MeO_05 said:
Hi ! i have a few questions for you guys please help!

i actually have a gaming computer wich is working really great ! but i would like in the future add another ati radeon HD 6990 but.... do im gonna have power enough to run it ? does my cpu is going to bottleneck it ? my rams are ok ?

here are my specs:

CPU: intel core 2 extreme 3ghz overclocked at 4ghz
mobo: asus p5e3 deluxe crossfire ready 2X pciexpress 2.0
rams: 4x2 gb= 8gb DDR3 1333mhz
psu: antec truepower quattro 1200 watt 80 plus certified
graphic card: XFX radeon HD 6990

so does it gonna work great with another 6990 ?
or im not gonna have power enough to run these 2 6990 ?
on the AMD web site they said that we need 1200 watt 80 certified power supply to get maximum performance but i doubt cause of my overclocked cpu that is actually takes a lot of power (1.52 volts)...hope its gonna be alright.... i dont wanna buy another poweer supply these are so expensive



My cheap win commander II 1200W powers all of my cards and I have had them running as high as 950MHz with no catastrophic meltdown(yet).
If you insist on upgrading, add a 6970 instead. It scales quite well. I play bf3 at 5760x1080 in ultra and I can tell you first hand a 6990+6970 is great. I did some benchmarking with fraps and repeated the same level for the same 5 minute time frame and with the 6990 my average fps was 40.8, the 6990+6970 it was 57.39 and with the 6990+6970+6970 it was 77.25. The reason I say do not get another 6990 is because it causes bf3 to crash anywhere from 5-10 minutes into the game depending on how much action is on the screen. It's too bad because it does work but it will cause your game to crash constantly. I was lucky enough to have a 6990 and two 6970's so I could just disable a 6970 and I was good to go but anyone in the bf3 forum who runs crossfire 6990 has to disable crossfire to play. I hope the next driver release fixes this but who knows if that will happen. Benchmarks like 3dmark11 work great with a 6990+6970 but as soon as you add another 6970 it gets confused and you actually score a bit less that you do in trifire. The only game that I have played that scales well with quadfire is bf3 but it crashes constantly. I am still holding out that there will be a game that eats gpus' for lunch that will take quadfire 6970's to tame it.
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February 3, 2012 12:38:25 PM

thanks a lot for your reply. but you know... i play bf3 as well with only 1 6990 and it crashes about 5-10 minutes after starting to play so i dont really think that its cause of the crossfire 6990 it has the same issue with only 1 6990.

and i didnt know that you could put 2 different cards in crossfire ? i thought that you could only do crossfire with 2 same cards :o  ? and the benchmark wasnt really bad with 2 6990 it depends only what kind of game you play some games show poor performances in crossfire and some games show good performances tho :p 
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a b U Graphics card
February 3, 2012 1:05:53 PM

MeO_05 said:
thanks a lot for your reply. but you know... i play bf3 as well with only 1 6990 and it crashes about 5-10 minutes after starting to play so i dont really think that its cause of the crossfire 6990 it has the same issue with only 1 6990.

and i didnt know that you could put 2 different cards in crossfire ? i thought that you could only do crossfire with 2 same cards :o  ? and the benchmark wasnt really bad with 2 6990 it depends only what kind of game you play some games show poor performances in crossfire and some games show good performances tho :p 



If your game crashes 5-10 minutes in, you have another problem. Running 6990+6970 my game never crashes and all gpus are running 98%. As soon as I add second 6970 I am lucky if I can play for 5 minutes before the game crashes. I have read in many forums including the bf3 forums that 6990+6990 crashes 1-5 minutes into play but a single 6990 or 6990+6970 works just fine. You can crossfire any 6xxx series gpu together. Since the 6990 is exaclty the same as two 6970's aside from the dialed down gpu and memory clocks, they work well together. If you crossfire a 6990 or 6970 with a 6950, they will all work at the speed of the slowest gpu. So if you crossfire a 6970 with a 6950 you basically end up with crossfire 6950's. Benchmarks like heaven 2.5 work well with quadfire and show excellent scaling. 3dmark11 does not. I am not at my home pc but my approx 3dmark11 scores for the 6990 was roughly p9500 and p13000 for the 6990+6970. As soon as I add the second 6970 my score actually drops to p12800. Search the 3dmark11 website for the highest quadfire 6970 score and you will see it is around P14000. That is on par with the highest trifire 6970 score. BTW, there are no 6990 scores since it shows as crossfire 6970. I don't mind overkill but I am just trying to help you based on my experience. Most people are saying don't do it and I am just saying if you do it you should break that 2nd 6990 into to 6970's. Trust me, it will help especially in a game like bf3 where you only have to disable one 6970 istead of the entire 6990.

***Edit***

On second thought maybe I should do some research before opening my mouth. Didn't realize core 2 extreme was 4 core. Just saw old platform and assumed the worst.
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February 4, 2012 10:40:51 AM

lol my gpu seriously :o  i actually have a core 2 extreme overclocked at 4ghz :o  its better of the most i7 quad core cpus :o  except the i7 extreme :o  lol

core 2 extreme 12 MB overclocked at 4 ghz 4 cores fsb speed 1066 lithographie 45 nm

price =1200 $ lol what cpus could be better ? lol extreme i7 lol ? :p 

i cant change my rig cause i just changed it to get the core 2 extreme cause i really wanted it that was the cheapest way to go for the maximum performance that i wanted i couldve go with the new series of i7 but no i found that it was better to go with the old intel cpus that was costing less with better performances i mean for the core 2 extreme lol

and my mobo isnt really bad its a x38 chipset and a 45 nm cpu ready (300$) lol specially made for the extreme cpus ;) 
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a b U Graphics card
February 4, 2012 10:47:59 AM

MeO_05 said:
lol my gpu seriously :o  i actually have a core 2 extreme overclocked at 4ghz :o  its better of the most i7 quad core cpus :o  except the i7 extreme :o  lol

core 2 extreme 12 MB overclocked at 4 ghz 4 cores fsb speed 1066 lithographie 45 nm

price =1200 $ lol what cpus could be better ? lol extreme i7 lol ? :p 

i cant change my rig cause i just changed it to get the core 2 extreme cause i really wanted it that was the cheapest way to go for the maximum performance that i wanted i couldve go with the new series of i7 but no i found that it was better to go with the old intel cpus that was costing less with better performances i mean for the core 2 extreme lol

and my mobo isnt really bad its a x38 chipset and a 45 nm cpu ready (300$) lol specially made for the extreme cpus ;) 



Anyway, you still have a problem with bf3 crashing that should not be related to your gpu unless it is faulty.
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a b U Graphics card
February 4, 2012 1:44:08 PM

BF3 has never crashed on me... what drivers are you using? Catalyst 12.1 release note they mention BF3 crasing under Ultra and stuttering with MSAA enabled. The 12.2 preview driver are pretty good but get some texture artifacting in Dirt 3 (only game that does it).

I just swapped out a 6970 and added a second 6990 and I'm happy. I have many games and benches and run at 5760x1080 - what do you want to see...




Hate to break it to ya, but the Core 2 Extreme is dated and it has no chance against a 2600K...~
http://www.anandtech.com/bench/Product/48?vs=287
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a b U Graphics card
February 4, 2012 6:20:03 PM

RussK1 said:
BF3 has never crashed on me... what drivers are you using? Catalyst 12.1 release note they mention BF3 crasing under Ultra and stuttering with MSAA enabled. The 12.2 preview driver are pretty good but get some texture artifacting in Dirt 3 (only game that does it).

I just swapped out a 6970 and added a second 6990 and I'm happy. I have many games and benches and run at 5760x1080 - what do you want to see...

http://i1081.photobucket.com/albums/j357/russwood8814/batman2.jpg
http://i1081.photobucket.com/albums/j357/russwood8814/batman.jpg

Hate to break it to ya, but the Core 2 Extreme is dated and it has no chance against a 2600K...~
http://www.anandtech.com/bench/Product/48?vs=287



Did you manage to get bf3 working with crossfire 6990? Just RMA'd one of my 6970 so I can't test 12.2 preview driver. What other games work well with your setup?
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a b U Graphics card
February 4, 2012 8:12:29 PM

alrobichaud said:
Did you manage to get bf3 working with crossfire 6990? Just RMA'd one of my 6970 so I can't test 12.2 preview driver. What other games work well with your setup?





Out of the list of games here I'd have to say the biggest problem givers are Crysis 2 (bad scaling but smooth), BFBC2 (really bad screen flicker since Catalyst 11.12), Grid (doesn't work with CF), Quake 4 (It has never worked exactly right for me despite constant adjustments in config) and Deus Ex (plays fine but just scales badly)... the rest work fine.

Using AFR through Catalyst for Crysis 2 works great and you'll get 100% scaling but at times you'll get some weird textures but it's not game breaking.
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February 6, 2012 9:54:11 PM

but sincerely i think that i would go for the 6970 as you said :p  but im really freaking out of the fact that im gonna regret not to buy another 6990 cause the drivers could be better and scale better that is gonna worth the price for 2 6990 ? that is a question :p  i really really want to be sure that im not gonna regret it :p  but seriously another 6970 for 340$ CAD for better performance than a dual 6990 i think it really worth the price tell me about it ! :p  thank you guyz ! :p 
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a b U Graphics card
February 6, 2012 11:33:48 PM

MeO_05 said:
but sincerely i think that i would go for the 6970 as you said :p  but im really freaking out of the fact that im gonna regret not to buy another 6990 cause the drivers could be better and scale better that is gonna worth the price for 2 6990 ? that is a question :p  i really really want to be sure that im not gonna regret it :p  but seriously another 6970 for 340$ CAD for better performance than a dual 6990 i think it really worth the price tell me about it ! :p  thank you guyz ! :p 



If you think you are going to regret it, you probably will. If you feel that strongly, then you should get the 6990. I was only trying to help you avoid spending over $700 to find out you are not getting any better performance. Of all the recent games that I have played including bf3, deus ex hr, need for speed the run, dirt 3, skyrim, FEAR 3, bf3 is the only one that scales well with 4 gpu's but it crashes like mad for me as well as many others who have posted in the bf3 forum. I have also found some minor artifacting in bf3 when in quadfire. Some of those games including Skyrim are limited to 2 gpu's. Even Deus Ex Human Revolution which is supposed to be optimized for AMD only scales with 2 gpu's. I also hope that new drivers/game updates take care of these problems and I didn't mind spending the money even though I currently have not found a game that scales well and works with quadfire. Though I do like benchmarking and this setup comes in handy as long as you don't use 3dmark11. Good luck with whatever you chose.
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February 7, 2012 5:32:57 AM

haha thank you very much buddy ;)  but you know your setup seem to be really good and for the price spend 750 $ for another6990 or spend 350$ for a 6970 that is gonna improove the performance better than dual 6990 i think i would go with a tri fire 6990+6970 and the 6970 is even faster than the 6990 (880mhz engine clock-1375mhz memory clock.

so, that means that i thought to turn the bios #2 on (6990) to get 880mhz of engine clock and overclock the memory clock to 1375 mhz.

summary, that means that the 2 cards gonna have the same speed to work together properly, that gonna be faster and im gonna have the spec of the 6970 more in my system for 350 $ i really think its worth it :o  :p  but im still thinking about it, you know, its like buy it and 1 month later they gonna drop the price of these cards in 2 and the drivers gonna kick out every games with dual 6990 thats what im scared of lol :p  and i would cry ! lool xD ;) 
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a c 271 U Graphics card
February 7, 2012 11:17:50 AM

MeO_05 watch your language.
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February 7, 2012 5:28:26 PM

ok sorry about that buddy
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