From what I've read here it looks like the MSI Z77A-GD65 with an Ivy Bridge CPU is the way to go for 7 GPUs. Up to 6 GPUs the MSI Z77A-G45 look to be the better choice if you don't mind having to presence short one of the slots.

There is about a $40 difference in price and you can use a slightly cheaper Sandy Bridge CPU with the G45.

Personally I think I may use a Z77A-GD65 with Ivy Bridge in my next rig even though I have a new 890FXA-GD70 set aside for it.
Will ANY Ivy Bridge CPU activate the 7th slot on the Z77A-GD65? Thinking of using the G1610. It's listed at 10 watts less than the G550 I have in my Z77A-G45.

Fun stuff

Yup, picture says it all:



I do wonder... if you use a x16 riser in the orange highlighted slot will you still need to PCIe presence short it?

I'm actually running this board now with two 7970s in a HAF XM until I get powered risers and a custom case. The card between the CPU and second GPU runs about 6-7c hotter.

Plan to use the MSI 890FXA-GD70 in the custom case I plan to build so wont be using more than two cards on the MSI Z77A-G45 until I build a second many months down the road.

I found this thread helpful on the MSI Z77A-G45

https://bitcointalk.org/index.php?topic=97154.0;all

HP ProLiant DL360 G7
(2) Intel(R) Xeon(TM) Processor 2.533 GHz (x64 Family 6 Model 44 Stepping 2)
Running HyperV with two VMs (AD&Exchange)

-t 20

Ok, it's all in the GPU-README.

 
(lack of sleep)

Think I figured it out.

Adding this setting fixed it: --gpu-map 0:1,1:0

I guessed as I did not know how to find the ADL number. Anyone know how to find the ADL number without having to install the AMD Display Library?

Think it has something to do with --gpu-map
Investigating

Seems to happen no matter what the intensity is set at. In the example it is set to 13.

Anyone run into this?

The GPU #, temp, and RPM lines are mixed up:

http://www.flickr.com/photos/95598166@N05/8724607830/

Sorry about the hyperlink to flickr. What do you use to embed the image?

7jGdHiKdeA9LzBRzJxGKQKeBxTuN7SbhJk


Thanks!

Wow, thank you blastbob!

CQVEMwNQsVDYpEuykpaQ4UxYH6GMMePGUY

I didn't get anything either

Live and learn.

Look into the MSI Z77A-G45. It may not have that 7th card CPU limitation. It does not have a power button on the MB though :/

The third PCIe slot is gen2 on the Z77A-G45 instead of gen3 link the Z77A-GD65 which is fine for mining.

No powered risers on the Z77A-GD65 huh? I wonder if the Z77A-G45 needs powered risers.

Does the need for powered risers have anything to do with scrypt vs SHA?

I am looking at having something like this built myself. I need to put it into a standard 19" rack though. When you say 19" wide do you really mean around 17.8" since that is the maximum that will fit in a 19" rack. I was going to do 17.5" myself. Most server enclosures are 16.9-17.1 to accommodate for rails.

I was shooting for only 8 cards across that 17.5" knowing that the most an affordable MB could use is 7. Thinking 7-8 cards across 17.5" would allow for enough space between them for airflow. Could reduce the # of cards as necessary.

My design was going to have the cards on top and the MB under them. The PS's were going to be under the MB. I was going to have the top bottom and sides enclosed with the front and back open for push/pull fans. The front would push in cold air and the back would pull hot. This is for a hot/cold isle in the server rack.

These are just my thoughts. Haven't gotten as far as you in designing it. Keep up the good work!  

Thank you for your help!

Reloading W8 only using v3.1 did the trick. 

Thanks. I was going to install AMD-APP-SDK-v2.7-Windows-64 since I read that 2.8 had problems but if the SDK is no longer needed I will skip it.

Thanks for the suggestion. Uninstalled 13.4 and installed 13.1 but that did not work.

Now BTC mining causes the same error. 

Even cgminer --benchmark is causing the error now.

Going to try reinstalling W8 from scratch only using the 13.1 drivers.

Question: Is AMD-APP-SDK-v2.8-Windows-64 required for scrypt mining?

Hi everyone. Was wondering if you could help me with trying to mine LTC?
I am able to mine BTC fine but I just can't seem to get LTC working with cgminer

Here is my config:

cgminer --scrypt -o stratum+tcp://stratum.us.give-me-ltc.com:3333 -u worker.1 -p password --intensity 10 --shaders 2048 --worksize 256 --thread-concurrency 8192 --gpu-threads 2

I always get a windows message box saying cgminer.exe has stopped working.

I tried cgminer --benchmark and it worked fine but when I try cgminer --benchmark --scrypt it errors with a windows message box saying cgminer.exe has stopped working.
It seems as if --scrypt is causing it to crash



If I try cgminer --scrypt --verbose I still get the same error after entering the password.


Any idea?  Using a 7970 on Windows 8 x64 with cgminer 3.1.0 (also tried 3.0.1). Driver version 9.14.10.0969. Catalyst 13.4

I use a data center for stuff other than mining. Just so you can get an idea of the cost here is what I pay.

4 full size enclosures
1 two post rack
Multiline FastE
100 Mbps internet with 10 Mbps base
1 20amp/208volt redundant pair
2 20amp/120volt redundant pair
2 20amp/120volt

Total 100 amps of power
80 amps of usable power

Limited to 125 watts/sq ft

about $4,300/month

Recently evaluated moving to other data centers but we seem to be getting a great rate for being in a premier data center. Found that we would end up paying more for lesser data centers. Our price might be because we have been there for around eight years now.

Note:
To comply with National Electrical Code Article 220.3 (B) (9) (pre 2008) and 220.14 (I) (2008 and later) we are allowed continuous loads to draw only 80% of a circuit breaker’s rated capacity