Can you combine 2x6990 with 4x5870 on H81 Pro BTC? 0.1BTC bounty

[Timmieman]

Hiya,

I`m planning on making a litecoin rig with 3x 5870 and 3x 6990.
Would this be possible?
I`m also using a GA-Z77X-D3H motherboard and an Celeron 1620 ivy bridge.

The thing that bothers me is the fact that you would need an ivy bridge in order to use 6 GPU's, but does that mean I cannot use 3x 6990 + 3x 5870 since that actually are 12 9 cores?

thanks in advance


Edit: I can't count when i`m sleepy!

[snowb0110]

it's not possible with just one board. also you would have 9 cores (5870s have 1 core)
cheap amd boards + chips will do the same job.

6 cores per rig else drivers will fail.
expect a TON of heat from those 6990s.


best regards

[empoweoqwj]

6 graphics cards on one mobo is pushing it a little

[eduncan911]

Also, ATI drivers limit you to 8 total GPU "cores."  The 6990s have 2x GPUs per card.  So, 3x 6990s = 6 GPUs to start.  That only leaves room for 2 more .

[Timmieman]

6 graphics cards on one mobo is pushing it a little

In terms of what? I have powered risers, so that takes away a lot of stress, memory bandwith is more than sufficient



So, is it 8 cores or 6?

Anyone who can confirm?

[eduncan911]

So, is it 8 cores or 6?

Anyone who can confirm?

Only from what I read: 8 cores if the ATI drivers support it.  Newer drivers support it, older ones, that miners like, do not.  Also, for some reason, miners go for LGA1155 mobos for 8 GPU cores.  Maybe older LGA1366s don't support 8 GPUs?  Don't see why not, has more than enough bandwidth (I have a few LGA1366 systems lying around here).

E.g. 4x 7990s, or 4x 6990s, or 2x 7990s and 4x R9 290x in my planned setup, etc.  8 GPUs in a single rig.  Do some searches, there are plenty of 8 GPU rigs out there like that.

[Timmieman]

A lil update here,

Have got 2X 6990 and 3X 5870 working.

Though I cant seem to get my last 5870 to kick in, the mobo keeps rebooting.
I`m using the H81 PRO BTC motherboard with an ivy bridge

Btw, i`m using W7 64bit with newest drivers 13.12 I believe

Cheers

Edit: 0.1BTC bounty added!

[Timmieman]

Other question:

If the card is blowing it's fan for 100% at startup and it's not recognized, is that a driver problem or a presence problem?
So if there would be a driver issue, it would be recognized in device manager but with an exclamation mark or something?

Cheers,

[Starscream]

Have got 2X 6990 and 3X 5870 working.

Though I cant seem to get my last 5870 to kick in, the mobo keeps rebooting.

If I assume you made a mistake here (total of 4x 5870) since in your OP you wrote you have 3x 6990 and 3x 5870, than what you wanted to type is:

Have got 3X 6990 and 2X 5870 working.

In that case, it makes sense: In Windows 7 64bit you can run up to 8 single GPUs and since the 6990 are dual GPUs and the 5870 are single GPUs, the total of GPUs you got to run is exactly 8 ( 6 for the 6990 and 2 for 5870).
Even if the opposite is true (you got 2x 6990 to work and 3x 5870) than the total still holds true: 7 GPUs with a spare 6990 which counts as 2 (thus can't work under win7).

Your only option is to either install Windows 8.1 or move to linux.

[Timmieman]

I indeed made an error and then I changed the topic name.
Currently I have 2x 6990 working and 3x 5870. But I want to add another 5870.
When I do so now, the last 5870 does not POST.

You say that Linux is a possibility, do you mean Linux BAMT?
I've read that only 7 GPu is the max there.

I'd like to keep using cgwatcher so its gonna be windows 8 I guess.
You have any verification that 8 GPu's work with this mobo and windows 8?

Cheers,

[Starscream]

I indeed made an error and then I changed the topic name.
Currently I have 2x 6990 working and 3x 5870. But I want to add another 5870.
When I do so now, the last 5870 does not POST.

You say that Linux is a possibility, do you mean Linux BAMT?
I've read that only 7 GPu is the max there.

I'd like to keep using cgwatcher so its gonna be windows 8 I guess.
You have any verification that 8 GPu's work with this mobo and windows 8?

Cheers,

Well, in that case, all your cards should work under windows 7 64bit, since the sum of your GPUs is exactly 8, but perhaps because you are using 6 separated cards, there's some issue with windows, because your mobo should be able to handle 6 cards without an issue so it can't be the problem.
Here's the H81 Pro BTC with 6 cards: http://www.youtube.com/watch?v=t3iup26oUN4&feature=youtu.be
As for Windows 8, the verification you want is all over the net.

But definitely try out Windows 8.

[Timmieman]

Will definitely try out!

Thanks for the tip, will post the results tonight!

Cheers,

[Timmieman]

Installed Windows 8.1, with newest catalyst drivers.
Though when plugging in the 8th gpu core, the last 5870 doesn't POST and I have to clear CMOS to get the rig starting up again.

Anyone else has a solution?

Cheers,