Radeon 295x2 Mining set up | Bitcointalksearch.org

antantti

legendary

Activity: 1176

Merit: 1015

Quote from: npittas on July 20, 2017, 07:20:29 PM

1 XFX 295x2 at 31+31.5Mh/s

The XFX needed a Fan on the Back for the VRMs and 2 x SP120 fans for the Radiator, Push/Pull, plugged to the motherboard and set at constant 100% Speed.

Not worth it to push them anymore imo, try core 992 for sapphire 1030 model and 981 for the 1018 models, you will see that voltage drops too. Also mem speeds higher than 1250 make no sense if mining dagger.

Quote from: npittas on July 20, 2017, 07:20:29 PM

I never found any Bios for straps or Undevolt for any of them. I could surelly use one!!

It's not that hard to modify straps yourself. Hawaiibiosreader, HxD, gpu-z and atiflash are all you need. Nerdralphs cgi-tool might help too.

npittas

newbie

Activity: 29

Merit: 0

My Rig has:
3 Sapphire rx470 Reference at 27Mh/s
1 XFX Black Edition rx470 at 26.5Mh/s
1 XFX 295x2 at 31+31.5Mh/s
on an MSI 270-A Pro with 4Gb Ram
The XFX needed a Fan on the Back for the VRMs and 2 x SP120 fans for the Radiator, Push/Pull, plugged to the motherboard and set at constant 100% Speed.
I had to undervolt through AB
Core Voltage at -70mV for GPU0 and -75mV for GPU1
Core at 1100
Memory at 1350-1400
And it still hovers around 71-72 degrees.
Next step would be to change the VRM Thermal Pads.

I have build another 3 x 295x2 rig with 1 XFX and 2 Sapphire. Same exact throttling problem, but only for the XFX, since I couldn't undervolt more than 60-65mV without crashing GPU0 every 3-4 hours. Sapphires are working like beasts at the same settings, without throttling and with -100mV

I never found any Bios for straps or Undevolt for any of them. I could surelly use one!!

antantti

legendary

Activity: 1176

Merit: 1015

Quote from: Faboo005 on July 20, 2017, 10:28:52 AM

The main problem with them is finding a tidy place to put the fan, and keeping them cool.

S_Natural gave some good tips, also adding another fan to make it push+pull radiator helps.

What I would suggest though is to install water cooling. Temps are easily down 10-30 celsius depending on your setup, gpu is fanless so it is silent and as a special bonus it becomes a one slot card, block+card+backplate is only 21mm thick.

They pull almost nothing from pcie slot so no need for risers. Add long tubing + radiators outside and you have a dirty powerful rig without heat/ noise problems.

Quote from: Faboo005 on July 20, 2017, 10:28:52 AM

Also avoid automated driver updates at all cost, as some of the more modern drivers will break your cards.

Easiest workaround for this is to roll back drivers in device manager, windows will ask reason for this and stops autoupdating.

Cards use bfr memory, modding straps gives a nice boost to equihash, from 660 closer to 800. Cryptonight gets some boost too, last time I tried dagger was unaffected. But that was many many dags ago so things could have changed.

To sum it up, if power is no problem and you have enough psu's and quality power cables+connectors, 295x2 is still a really nice toy to play with.

edit: It isn't a 8GB card, it is a 2 x 4GB card. So two turkeys doesn't make an eagle there...

Faboo005

newbie

Activity: 46

Merit: 0

I mine with 295x2 cards.

I mine on ETH, they produce about 55MH each.

The main problem with them is finding a tidy place to put the fan, and keeping them cool. Also avoid automated driver updates at all cost, as some of the more modern drivers will break your cards. This is also a good reason not to mix in modern RX cards.

I wrote more about this here: http://blockchurn.com/2017/07/04/is-the-r9-295x2-the-miners-holy-grail/

Batelk

full member

Activity: 216

Merit: 100

Quote from: S_Natural on July 19, 2017, 11:10:06 AM

Quote from: DKCMiners on July 17, 2017, 12:47:40 PM

Who is successfully mining with Radeon 295x2 (s)?

What coin are you mining and what performance are you getting?

Are you using Linux or Windows?

What hardware are you using with it (motherboard, power supply, processor, memory, etc.)?

For multi-gpu rigs that include a 295x2, any problems pairing with other GPU that have different memories?

Thank you for your time and feedback.

If you want to mine with 295x2 you have to do some thing:
1. Change the fan 9mm, the original fan not good.
2. Change the fan 120mm of rad and put the 3pin of this fan into the sys fan in the motherboard.
2 tips will help fix throttle.
For more efficiency you should mod the bios (undervolt and clock) to make it's run under 70C and TDP <350W at wall.
For ETH or ZEC, you can mix with any GPU (red or green)

The 295 are old cards. It is better to underclock and undervolt to get better efficiency.

S_Natural

member

Activity: 154

Merit: 11

Quote from: DKCMiners on July 17, 2017, 12:47:40 PM

Who is successfully mining with Radeon 295x2 (s)?

What coin are you mining and what performance are you getting?

Are you using Linux or Windows?

What hardware are you using with it (motherboard, power supply, processor, memory, etc.)?

For multi-gpu rigs that include a 295x2, any problems pairing with other GPU that have different memories?

Thank you for your time and feedback.

If you want to mine with 295x2 you have to do some thing:
1. Change the fan 9mm, the original fan not good.
2. Change the fan 120mm of rad and put the 3pin of this fan into the sys fan in the motherboard.
2 tips will help fix throttle.
For more efficiency you should mod the bios (undervolt and clock) to make it's run under 70C and TDP <350W at wall.
For ETH or ZEC, you can mix with any GPU (red or green)

vuli

full member

Activity: 233

Merit: 100

Andrius | Junior Business developer at Unboxed ICO

if the drivers support 295 and 580 than yes, else you might have a problem

TenCashMan

newbie

Activity: 4

Merit: 0

Quote from: Batelk on July 17, 2017, 01:08:14 PM

Quote from: YIz on July 17, 2017, 12:55:04 PM

Your best bet is mining Zcash with Claymore's miner. You can pair the 295X2 with any other GPU (AMD GPU) or Nvidia GPUs if you are mining ETH.

Can you pair that with RX 580?

Yes. You can. If you are using Claymore's Eth miner you can even use the 295x2 with NVidia cards.

Batelk

full member

Activity: 216

Merit: 100

Quote from: YIz on July 17, 2017, 12:55:04 PM

Your best bet is mining Zcash with Claymore's miner. You can pair the 295X2 with any other GPU (AMD GPU) or Nvidia GPUs if you are mining ETH.

Can you pair that with RX 580?

YIz

hero member

Activity: 686

Merit: 502

Your best bet is mining Zcash with Claymore's miner. You can pair the 295X2 with any other GPU (AMD GPU) or Nvidia GPUs if you are mining ETH.

DKCMiners

newbie

Activity: 4

Merit: 0

Who is successfully mining with Radeon 295x2 (s)?

What coin are you mining and what performance are you getting?

Are you using Linux or Windows?

What hardware are you using with it (motherboard, power supply, processor, memory, etc.)?

For multi-gpu rigs that include a 295x2, any problems pairing with other GPU that have different memories?

Thank you for your time and feedback.

Topic: Radeon 295x2 Mining set up (Read 1031 times)