Topic: Windows 7 64 bit dual 5970 rig question - page 2. (Read 7053 times)

Exactly. As you can see from the imageshak graph. The 'bad' gpu runs well on Phoenix for a very short while. It is hashing. Work is gotten from server, and even submitted. Then suddenly, just bom, GPU percentage use goes to 0 and phoenix miner freezes.

So honestly I do not know if it would have made a  diff if I had dummy plugs in all outlets on the back of the card.

First of all dishware, thanks for your answer.


Tried both stock speed and up until 800Mhz, no difference in how the 'bad' gpu behaves.

I mostly made express installs, and if there's 'too much' stuff installed, please enlighten me as to how that would negatively affect my setup.  I run 11.1, not 11.4. I tried 11.3 which is the newest from here: http://support.amd.com/us/gpudownload/windows/previous/Pages/radeonaiw_vista64.aspx

The win 7 64 bit selection leads to that page, I think the name (vista) is just misleading.

11.3 did not work well, it made the system crash, believe it or not. So I went for 11.1 which seem to work well.


Yes, I've read that. But does it also apply to win 7? Anything less than 11.1 on the ati drivers page has no mention of windows 7, only vista, but perhaps the vista and win 7 drivers are interchangeable? Besides, the rig works with the current setup, also with the 'bad' gpu if the card with the 'bad' gpu is left alone in the box.


I hope that's not the case. :\ Fan is running at 100% with temps 70-73 celcius on gpu 2 and gpu 3, and the 'bad' gpu and the other gpu on that card is running at aprox 50 celcius.



Already did that. If a single card runs alone. Then it works fine. The trouble is just the one 'gpu' when both cards are running.

I  might just try that, altough I have this feeling it will not work. Not because it would not work in theory, but because I think there might be some hw issue at play.


Exactly. Thanks for your most helpful reply!

I always thought from what I read that for users with that problem the GPU wouldn't be recognised full stop? This guy seems to have a problem where it just doesn't keep running long.

Yes, you need to plug in dummy connectors to all outlets when running a windows system. Don't ask me why.

All I know is that this is not the case when it comes to Ubuntu.

+1 for Linux!

I only run a single card in my regular PC that doesn't have very good cooling for a GPU and I had a few problems initially with lock-ups that I solved by lowering the mem clock and 1000Mz and the GPU to 750MHz. It might be worth a try just in case you have a problem with marginal power or thermal issues that only crop up when all 4 GPUs are running full tilt. In my case the temperatures were within spec so it took me a while to think of trying it, so just thought I'd mention it as something quick to try that might be worth a go.

OS: Win 7 64 bit, phoenix 1.4, SDK 2.4

I have some issues getting all the gpu's to work properly. And thus I have some questions:

I read in this thread: http://hashcat.net/forum/archive/index.php/thread-421.html

It says there that you need 4 monitors connected if you want to use all cores (4 in total) on 2x5970. Can anyone confirm this?

Also a possible solution was stated in that thread to have the cards connected with crossfire, and then just have one monitor
connected to one of the cards.

I wold think it was logical to have only one monitor connected to each card to make the mining work on all cores, do I really need to get
dummy connectors for all DVI-outputs?

I have two cards, both 5970, let us call them A (d0,d1) and B(d2,d3).

d3 never semmed to work properly with any miner that I tried. It worked for a short while then froze.

Please see this picture for the behaviour:
http://imageshack.us/photo/my-images/859/gpuactivity.png/

I tried to remove A and insert B only. then d2 and d3 both performed well with phoenix. Once I insert A, I have issues with d3 again. It just starts, runs for a few seconds, then freeze. There is one monitor attached to a cable from each card (I tought this was sufficient).

I'm stuped as to how this problem occurs, and I'd like to set up the source for phoenix to run some debugging with it to see what really happens here, but not sure which environment to use, and how exactly to do that, but if anyone gives me any pointers. I'd figure it out.

I am tempted to write off d3 as an hw issue, but won't give up just yet.

I'm interested in knowing which software versions and how cables and/or dummy plugs are connected to your cards if you run a dual 5970 setup under windows.

Also would I possibly have more success if I used Ubuntu? My next move will be to install Ubuntu to see if I can get all cores working under Ubuntu. I really don't care if I use windows or Ubuntu, all I want is to get this damn thing to work. Again, if anyone helps me to solve this issue, I'd gladly donate a sum that will make you feel it was worthwhile helping me. I've been looking into this on and off for weeks, but intensified the efforts the lasts days, so far with limited luck.

I was thinking of alternative solutions like restarting d3 mining every time it locked up (would not be optimal, but better than nothing), but when I restart the miner, nothing happens, a reboot is actually required.


I run one bat-file for each worker, the content of each file is as follows, with device ranging from 0 to 3.


I I run poclbm from the command line with no parameteres, it too will freeze. Gpu-Z or GpuCaps will not run either. So I suspect there might be something wrong, and I am not sure if the hw or the sw is to blame. But for the record, d0,d1 and d2 runs just like a charm, it's only the 4th gpu, device 3 that's not working. That'll be the slave gpu on my 2nd 5970.


Thanks in advance for all the help you can provide.