Issue getting my 7950 above 600Khs

[Pansyfaust]

Hey fellow miners, hope the grinding is rewarding

I just manged to finally set up my "three card" miner. I have the 7990 and one 7950 running. On my gaming PC I was able to get over 600Khs with the 7950 with G-1 and TC at 24000 and intensity 20 with some overclocking.

Now the issue is that I want to run the 7950 with the same settings on my mining PC, but it wont run AT ALL at all with G-1 settings. It can only run it with G-2 and 8192 TC and with a hefty OC it can only get max 560Khs, which is a lot lower than I would like it to be. Even if I take out the 7990 and try run the 7950 with g-1 settings it wont run, says something about memory buffer etc being wrong. Any advice? Do you think it requires a windows format and re install etc because it seems that even without the 7990 in the machine the 7950 can only use the settings that work for the 7990. Software issue?

 

[Flashgear]

Hey fellow miners, hope the grinding is rewarding

I just manged to finally set up my "three card" miner. I have the 7990 and one 7950 running. On my gaming PC I was able to get over 600Khs with the 7950 with G-1 and TC at 24000 and intensity 20 with some overclocking.

Now the issue is that I want to run the 7950 with the same settings on my mining PC, but it wont run AT ALL at all with G-1 settings. It can only run it with G-2 and 8192 TC and with a hefty OC it can only get max 560Khs, which is a lot lower than I would like it to be. Even if I take out the 7990 and try run the 7950 with g-1 settings it wont run, says something about memory buffer etc being wrong. Any advice? Do you think it requires a windows format and re install etc because it seems that even without the 7990 in the machine the 7950 can only use the settings that work for the 7990. Software issue?

Should just sell me the 7990. Problem solved.

 

[Pansyfaust]

Should just sell me the 7990. Problem solved.

Hahahah...hahaha....ha....NO. You had your chance, but you guys gave it to me instead!

 

[Flashgear]

Hahahah...hahaha....ha....NO. You had your chance, but you guys gave it to me instead!

D: /sadpanda

But on a serious note. Is your PSU enough for those 3 cards? Also, I've heard on 2+ 7970's you need more than 4Gb RAM, Have you got this?

 

[Pansyfaust]

D: /sadpanda

But on a serious note. Is your PSU enough for those 3 cards? Also, I've heard on 2+ 7970's you need more than 4Gb RAM, Have you got this?

I'm using a Seasonic 850W PSU, silver rated. Its a tad touch and go, but the 7990 has been undervolted quite a bit to 1.095, saving at least 30-40W per GPU. The 7950 is also running at stock though at 1.094

The ram idea is interesting as I only have 4 gigs. Will bring my 8gb from my gaming PC and try it out.

 

[Flashgear]

I'm using a Seasonic 850W PSU, silver rated. Its a tad touch and go, but the 7990 has been undervolted quite a bit to 1.095, saving at least 30-40W per GPU. The 7950 is also running at stock though at 1.094

The ram idea is interesting as I only have 4 gigs. Will bring my 8gb from my gaming PC and try it out.

I know with 2 R9 290's you need 8Gb so it seems like a plausible idea.

 

[roligov]

Also, I've heard on 2+ 7970's you need more than 4Gb RAM, Have you got this?

That's a myth. I've run 6 x R9-280X cards on 1GB of memory before, but it sits at 80% usage. Running 2GB of memory per 6 cards now in all my rigs. Granted I run linux but it's more to show cgminer/sgminer and scrypt mining in general is not system memory intensive...It makes use of the 3GB of memory on the cards themselves.

 

[Flashgear]

That's a myth. I've run 6 x R9-280X cards on 1GB of memory before, but it sits at 80% usage. Running 2GB of memory per 6 cards now in all my rigs. Granted I run linux but it's more to show cgminer/sgminer and scrypt mining in general is not system memory intensive...It makes use of the 3GB of memory on the cards themselves.

Just what I've read online for 290's to be able to do TC 32000 + or something to that figure

Edit: Just one example. https://bitcointalk.org/index.php?topic=413630.0

 

[roligov]

I'll ask [MENTION=23192]gox1201[/MENTION] to be the guinea pig He's got 4 x R9-290's in a 1 rig, I'll ask him to test with 2GB.

 

[gox1201]

Heh. Long story short is I have already. In Linux you need little to no ram with anything other than a 290. You can literally mine 7x 280x with 1gb ram. The 290s are slightly different. By looking at my memory use in Linux from 2 to 3 to 4 cards I can tell you that 4gb will be enough for up to 5cards to load the drivers, the 6th card you might run into memory error. This is only on loading though. For Windows it's completely different. The 290s take a lot of ram, and without 8gb you won't get thread concurrency high.

It will crash with that memory error.
Having said that, there are quite a few posts about the Asus cards and their mining problems. Ballpark hash rate you should be able to get would be shaders*gpuclock in ghz *0.34.

Use something like Tahiti mem info to see what ram you have on the 7950. Also post what bios version you have. Then we'll take it from there. g2 tc 8192 i13 core 1000 mem 1.5k

Sent from my GT-N7100 using Tapatalk

 

[Flashgear]

Heh. Long story short is I have already. In Linux you need little to no ram with anything other than a 290. You can literally mine 7x 280x with 1gb ram. The 290s are slightly different. By looking at my memory use in Linux from 2 to 3 to 4 cards I can tell you that 4gb will be enough for up to 5cards to load the drivers, the 6th card you might run into memory error. This is only on loading though. For Windows it's completely different. The 290s take a lot of ram, and without 8gb you won't get thread concurrency high.

It will crash with that memory error.
Having said that, there are quite a few posts about the Asus cards and their mining problems. Ballpark hash rate you should be able to get would be shaders*gpuclock in ghz *0.34.

Use something like Tahiti mem info to see what ram you have on the 7950. Also post what bios version you have. Then we'll take it from there. g2 tc 8192 i13 core 1000 mem 1.5k

Sent from my GT-N7100 using Tapatalk

What Asus cards are you referring to? A 290 or 7950. Asus R9 290 usually have Hynix memory(Ref cards).

Also, does the above you posted relate to a 7990+7950 for RAM in Windows like Pansy originally asked or is it just 290's?

 

[gox1201]

The ram is batch specific, so Asus r9 290s have either elpida or hynix. No default type. The 7950 has one of 4 types of ram, 2x hynix 1x elpida 1xsamsung. He should check what he has, since it makes it easier to help him optimize. The ram issue is for 290, since that is what I was asked to comment on.

The problems are usually a combo of bios and driver issues. But much easier to help once we have all the facts.

Also just upping core and memory won't increase the speed. In general you will find the stepping point for ram 1250 1375 and 1500.core speed has a much better return on hash, but it's a factor of your bios quality and ram timings

Sent from my GT-N7100 using Tapatalk

 

[Flashgear]

The ram is batch specific, so Asus r9 290s have either elpida or hynix. No default type. The 7950 has one of 4 types of ram, 2x hynix 1x elpida 1xsamsung. He should check what he has, since it makes it easier to help him optimize. The ram issue is for 290, since that is what I was asked to comment on.

The problems are usually a combo of bios and driver issues. But much easier to help once we have all the facts.

Also just upping core and memory won't increase the speed. In general you will find the stepping point for ram 1250 1375 and 1500.core speed has a much better return on hash, but it's a factor of your bios quality and ram timings

Sent from my GT-N7100 using Tapatalk

On a note I read online with regards to Hynix and Elpida is on the product code of the card, if it has 00 it means Hynix, 01 is Elpida, so you can basically judge what RAM the card has before you buy it. Determine Hynix/Elpida Memory on 290x cards based on Product Number before buying them! (Confirmation needed, please help if you have a 290x)

 

[Pansyfaust]

Hey guys, thanks for the assistance. [MENTION=23192]gox1201[/MENTION] the Memory is definitely Hynix as I can see the modules and Tahiti identifier said the same. I can clock the ram up to 1600 if I want, stable with no extra voltage. This does not get me any return on Hash though as the card seems to like Core 1000/1050 and Mem at 1350/1500. These clocks used to get me at about 620Khs with intensity at 20 and g-1, but I cant get them anywhere near that with g-2 settings and intensity at 13.

I might just have to up the core speed a bit then. Its okay though this card runs amazingly cool even clocked up to 1050/1500- temps with 100% fan never go above 65 Deg. So I was pretty sad when I could not get over 600 at these settings.

 

[gox1201]

Hmm. Try get me the details on your card bios and amd driver version. I'll try help

Sent from my GT-N7100 using Tapatalk

 

[Pansyfaust]

Hmm. Try get me the details on your card bios and amd driver version. I'll try help

Sent from my GT-N7100 using Tapatalk

AMD drivers are 13.12. Bios is 015.017.000.001.000000

 

[gox1201]

[MENTION=470]Pansyfaust[/MENTION] Ok sent you a pm with a link , read msg