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Help with overclocking 3x Radeon 6990 - Page 3

post #21 of 34
Thread Starter 
DSP1 wrote '3 6990s crossfired', that is what I replied to.

They are not connected for crossfire. I did research turning off crossfire between the GPU's that share a board (since I am interrested in the raw GPUs only), but I read somewhere that it can't be turned off on 69xx cards and left it at that.

I did mention I'm not an overclocker nor gamer, but perhaps I should specify that I haven't cared about video performance, crossfire, SLI and such ever and I'm just now jumping in because these consumer GPUs can be used to my advantage. So excuse me if I come over like a retard or troll, but I've just been at this for a couple of days. I normally only deal with enterprise hardware.
Quote:
Originally Posted by Scorpion49;15325842 
Can't crossfire three dual-GPU cards....

Couldn't power three dual GPU cards with a "cheap" AMD quad core even if you could...

images.jpg

Now this is interresting, I was wondering about the high CPU usage. What is the CPU time required for and what would you say is the minimum CPU that could 'power' them?
post #22 of 34
Quote:
Originally Posted by Scorpion49 View Post
Can't crossfire three dual-GPU cards....

Couldn't power three dual GPU cards with a "cheap" AMD quad core even if you could...




In the event he's serious, he just needs to drop-down on the OC utility and select the next card.
Nice contribution
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post #23 of 34
OP don't mind most of these twits. We (the ones with brains atleast) don't think for a least bit you're a troll, just a guy with real problems trying to get real work done. Not for a game or anything else, which is what most these people are used to, but for actual work. Sorry if I couldn't give that mug advice but I would look into Kens if you can and do a bios flash, that would be best.

Good luck OP.
     
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post #24 of 34
Thread Starter 
Quote:
Originally Posted by Spykerv View Post
...

That said OP, I wonder why MSI AB isn't working. I didn't see in your post whether or not you tried bios flashing. With Trixx, it doesn't save the profile, but you could always reset it each time am I correct? I feel like I'm missing something. Id say a bios flash is your best option, since you would never need to reset or tune anything. Overdrive won't help you, the only thing that I know that would've is MSI and it comes with a remote monitoring client which I'm not sure if would help you. It may be the extra 2 cores tripping it up, but it's strange none the less.
Flashing was the second thing I tried (RBE), but apparently ATI is using some crypto in these newer cards that will make the card useless if you try to flash clock values. The driver will BSOD if you change them.

Quote:
Any reason why you need the extra 20mhz? I'm not Experienced nor do I know anything about this stuff so sorry for my ignorance.
Well, I'm testing with two prototype machines at the moment. If all tests are successful there's gonna be a whole lot more. Every 7.5 machine this small overclock will yield an extra 900Mhz core for free.

Quote:
And get prepared for a lot of morons that are going to say WHAT A TROLLLLL. Ignore them, some people are just stupid, but most of us are not.
I've noticed
post #25 of 34
Quote:
Originally Posted by raphidae View Post
Flashing was the second thing I tried (RBE), but apparently ATI is using some crypto in these newer cards that will make the card useless if you try to flash clock values. The driver will BSOD if you change them.



Well, I'm testing with two prototype machines at the moment. If all tests are successful there's gonna be a whole lot more. Every 7.5 machine this small overclock will yield an extra 900Mhz core for free.



I've noticed
BIOS flash will not allow you to change a lot of things for 6xxx series due to BIOS driver-check, but only a certain thing, else, crash and BSODs. But it will be a solution to meet your requirement/scenario.

AFAIK, your motherboard will not allow you to put 3 6990s. That's the hardware limitation hence you only see 4 GPUs under Device Manager or in CCC. If you really need 6 to 8 GPUs, I would suggest get the intel X58 mainboard with 4 full PCIe lanes at x16. Or x8/x8/x8/x8 should do fine too.
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post #26 of 34
May I ask what type of rendering you're going to be doing? No need to divulge specifics that you don't want to... But something along the lines of CAD, Animations, etc.
Also my suggestion would be to formulate your question/issue at a board dedicated to the activity you're trying to accomplish... I'm not trying to tell you to leave this site... But if you go to a place where CAD Designers, 3D Modelers, animators, lighting specialists, render farm owners meet (CGTalk); you will have a much better chance at getting a response other than "Troll... You can't CF three 6990s"
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post #27 of 34
Thread Starter 
Quote:
Originally Posted by Ken1649 View Post
BIOS flash will not allow you to change a lot of things for 6xxx series due to BIOS driver-check, but only a certain thing, else, crash and BSODs. But it will be a solution to meet your requirement/scenario.

AFAIK, your motherboard will not allow you to put 3 6990s. That's the hardware limitation hence you only see 4 GPUs under Device Manager or in CCC. If you really need 6 to 8 GPUs, I would suggest get the intel X58 mainboard with 4 full PCIe lanes at x16. Or x8/x8/x8/x8 should do fine too.
I am seeing 6 gpu's in device manager, TRIXX and GPU-Z, that is not the problem.

I'm really looking for a simple solution to have the clocks stick across reboots that perhaps doesn't even need an utility? (Registry settings perhaps? Driver hack?)
post #28 of 34
Thread Starter 
Quote:
Originally Posted by xXSebaSXx View Post
May I ask what type of rendering you're going to be doing? No need to divulge specifics that you don't want to... But something along the lines of CAD, Animations, etc.
Also my suggestion would be to formulate your question/issue at a board dedicated to the activity you're trying to accomplish... I'm not trying to tell you to leave this site... But if you go to a place where CAD Designers, 3D Modelers, animators, lighting specialists, render farm owners meet (CGTalk); you will have a much better chance at getting a response other than "Troll... You can't CF three 6990s"
I'll try other boards as well

The main (RISC) renderer is for 3D animations. It's great at rendering the actual frames, however to prevent having to have ECC on all memory involved there's certain kinds of CRCs that are calculated to rule out any corruption. The main renderer is not so great at these CRCs, but a 6990 is

I'm hoping to offload these expensive CRCs to (relatively) inexpensive consumer hardware as to increase overall rendering performance by 120% or so.
post #29 of 34
Quote:
Originally Posted by raphidae View Post
I am seeing 6 gpu's in device manager, TRIXX and GPU-Z, that is not the problem.

I'm really looking for a simple solution to have the clocks stick across reboots that perhaps doesn't even need an utility? (Registry settings perhaps? Driver hack?)
OK, for 6990 at stock voltage can give you 940/1400 MHz for core/memory. If these clocks are good enough for your processing, you don't have to edit anything at all.

Remove all the tweaking software Afterburner/Trixx/Asus Smart Doctor etc as you don't need them.

You can set fix fan speed in CCC overdrive for each GPU. All your overclocking and fan speed will stick at every PC reboot.

For a 6990, ECC will start to kick in around 1400-1500 MHz.
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post #30 of 34
I'm concerned that a "cheap AMD CPU" could result in bottlenecking your cards. However, the fact that they are not in Crossfire (obviously) may reduce the typical CPU usage for this type of thing. I'm not sure how that'll work.

It'll be difficult to find out if these cards are performing to their full potential under such rare circumstances. Once you do find out how to overclock, I suppose we'll see if it scales properly. That should indicate whether or not there's a CPU bottleneck. You really should have gone with a Sandy Bridge build to be sure.
Edited by Mookster - 10/15/11 at 10:26pm
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