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Old 2013-05-05, 20:57   #1
Manpowre
 
"Svein Johansen"
May 2013
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Default 2x AMD 7990 or 2x Nvidia Titan ??

Hi all,

I am new to this forum, but been using my amd 6970 for past year for mixed opencl programming and some limited gaming. I found most fun with programming offcourse as I am an old programmer...

I am considering purchasing a 2k USD set for my machine, an amd 8150 8 core with a great motherboard.

With my 6970 the cpu only run at 10 percent with Mfakto.. but I think I dont get many GHz days with the card..

Therefore I have 2k USD burning, and I just cant choose.

I see the Titan has DP out of scale compared to 7990 ?

I know 7990 is a dual GPU set, and I also see possibility to do 630 Ghz days with one 7990. probably cross the 1k Ghzday with two of these cards.

BUT, CudaLucas cant be used on AMD cards, and I assume the Kepler architecture with DP is worth it for Titan ?

Also the Cuda library seems more enhanced than OpenCL, and also Maxwell is coming in a year with the ARM cpu built into the GPU which allows for GPU to access host machine memory. Im thinking 256GB memory on host with 2 of these Maxwell cards. Therefore I am interested in continuing with Cuda mostly because of this.

But. for the the next year OpenCL and Cuda I guess will be more than sufficient to program the GPUs and to do GHZ days with Mfakto or MfactC when Im not using the machine.

My cabinet is big and good airflow, so cards will be vented sufficient..

What do you think ? Would love some opinions in regards 7990 vs Titan and the possibilities..

Svein
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Old 2013-05-06, 00:01   #2
kracker
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It depends on what work you do, if you do LL tests the titans or even 690 is a no-brainer, but if you do TF(Trial Factoring), I'm not sure, there aren't any benchmarks on the 7990 yet but it seems the 7970 preforms better than the 680 on it it seems...
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Old 2013-05-06, 02:42   #3
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For TF, where you get your biggest "bang for the buck", get two GTX 690 cards and an 850W PSU.

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Old 2013-05-06, 02:51   #4
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Depends on what you want to do. For TF, I'm not sure which is better. For now, LL and P-1 only run on CUDA cards. Also, for LL and P-1, isn't Titan still faster than the two GPUs in a 690 combined?
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Old 2013-05-06, 03:44   #5
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Quote:
Originally Posted by frmky View Post
Depends on what you want to do. For TF, I'm not sure which is better. For now, LL and P-1 only run on CUDA cards. Also, for LL and P-1, isn't Titan still faster than the two GPUs in a 690 combined?
I think the two cores of the 690 produce more than a single titan, in TF.
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Old 2013-05-06, 03:53   #6
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Quote:
Originally Posted by kracker View Post
I think the two cores of the 690 produce more than a single titan, in TF.
Yes, the K10 core in the 690 is great at integer and single precision code, but sucks at double precision required in LL and P-1.
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Old 2013-05-06, 03:53   #7
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Neither CuLu nor CuPm1 are written to take advantage of the two cores in a 690, but if they were, they might have higher throughput than a titan.

Last fiddled with by owftheevil on 2013-05-06 at 03:54 Reason: typo
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Old 2013-05-06, 05:27   #8
Manpowre
 
"Svein Johansen"
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Default 690 great at single point bad at dual point

The 690 is 1/8 of dual point, but the Titan in DP mode is 1/3.

But I dont know how 2x 7970 is compared to that ?

I see that the most advanced algorithms are made for Cuda, atleast most developed, but other mining systems bitcoin, and even folding apps take advantage of AMD GPUs. So I wonder if 7990 would be the best for this machine, and mabye at later stage in a year invest in completely new machine and get ready for Maxwell when it comes out.

I also assume Nvidia will answer with 780 very soon now in may, and after summer with 790 which is a dual GPU of GK110 chip. TitanX2 on one board I guess. So this is why I still wonder now for the summer and late fall to just get 2 titans so I can get my code ready with cudaLibrary.

Its really hard to choose.. but in a year I know Maxwell is way to go.. but in that case I havent been doing cuda if I go with 7990s now.
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Old 2013-05-06, 06:05   #9
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With that much power you may want to consider water cooling. Just an idea.
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Old 2013-05-06, 12:51   #10
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Default Two 690s

I'm getting about 330 GhZ/day from each GPU (mfaktc) for a total daily output of 1,320 from the two cards.
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Old 2013-05-07, 22:03   #11
Manpowre
 
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Quote:
Originally Posted by Chuck View Post
I'm getting about 330 GhZ/day from each GPU (mfaktc) for a total daily output of 1,320 from the two cards.
Seems like mfaktC is more powerful than mfakto, I get 30 per day for one amd 6970...

Im considering seriously ordering 2x Titans for the Cuda library..

Did you set the cards to DP ?
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