Vega 64 low hashrate

[jimmy_007vn]

Hi all,
I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue?

I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me  

Update: No matter how i set my cards, there is always one card that dropped down to 1200H/s. Sometime that card reach 1500H/s then other 3 other drops total of 300H/s. So, total hashrate of all 4 cards in any case always around 7200H

[jimmy_007vn]

Up. i will reward 0.002btc for whoever help me fix this issue.

[krylz]

What motherboard are you using?

[Juggar]

Wasn't it the FE Vegas that had a hard ceiling of like 9000 H/s or something? Do you have any of those?

[Undefined31415]

Hi all,
I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue?

I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me 

What mining software are you using?

[CryptoPlay]

Set min fan speed to 3000.
It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY.

So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that.

If you was getting 2k, its not windows or bios. It is temp.

You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry.
http://vega.miningguides.com/p/tuning.html

good luck

[P00P135]

Hi all,
I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue?

I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me 

Make sure crossfire is disabled, might have to modify your registry.

[Digital Drug Lord]

Hi all,
I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue?

I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me 

powersupply

my BTC address

3Bt8AxDFP7DZoqwsivpSA8L8be1SnV4pFy

[Toughit]

Try one more stick of 4gb ram as a test, make sure you have 60gb virtual memory.  Try the ram first, dont do both at once

[jimmy_007vn]

What motherboard are you using?

Biostar TB85

[jimmy_007vn]

Hi all,
I got 4 vega cards, 2x56, 2x64. everything was fine until i added the 4th card to my rig. All 4 cards hashed about 1900-2000H/s for ~40seconds, then 1 one the card's hashrate dropped to 1400H/s. So i switched this card to different pcie slot. Then one of other 3 hashrate dropped. Im using TB85 motherboard, 4G ram. What do you recommend to fix this issue?

I assume the motherboard got bottleneck. but i don't know how to solve this issue. please help me 

What mining software are you using?

I tried both cast and stak, but same result.

[jimmy_007vn]

Set min fan speed to 3000.
It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY.

So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that.

If you was getting 2k, its not windows or bios. It is temp.

You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry.
http://vega.miningguides.com/p/tuning.html

good luck

HBM are all below 75.

[bubbagump]

Does your BIOS have a setting for "4g decoding" or a setting for changing the PCIE version to use?

[jimmy_007vn]

Does your BIOS have a setting for "4g decoding" or a setting for changing the PCIE version to use?

I have 4G option on, and tried both gen 1 or 2 for pcie. Also i added 4G ram to my rig this morning make it to 8G ram, 200G virtual ram. still sign of improvement.

[treanski]

Set min fan speed to 3000.
It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY.

So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that.

If you was getting 2k, its not windows or bios. It is temp.

You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry.
http://vega.miningguides.com/p/tuning.html

good luck

HBM are all below 75.

hbm temp needs to be below 70°C, make sure you disable/enable all vegas in device manager before mining. use registry powerplay tables. flash your 56 vegas with 64 bios for better hashrate
read this guide, every word!
http://vega.miningguides.com/

[Toughit]

Set min fan speed to 3000.
It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY.

So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that.

If you was getting 2k, its not windows or bios. It is temp.

You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry.
http://vega.miningguides.com/p/tuning.html

good luck

HBM are all below 75.

I run my vegas at a temp target of 62 with 3000 rpm fan

I think you said it is just the one card.

Can you run it alone again and set the temp target really low and the fan really high?

[jimmy_007vn]

Set min fan speed to 3000.
It is droping cuz of HBM temp and the fan rpm is related to core temp ONLY.

So, HBM must be bellow 70 witch means core temp must be bellow 60 since HBM is usually 10 hotter than core. You'll need to check that.

If you was getting 2k, its not windows or bios. It is temp.

You dont need to follow the guide but there is a lot of info there. Check windows settings and crossfire in registry.
http://vega.miningguides.com/p/tuning.html

good luck

HBM are all below 75.

I run my vegas at a temp target of 62 with 3000 prm fan

I think you said it is just the one card.

Can you run it alone again and set the temp target really low and the fan really high?

yea, its just one card. Before it was the Red Devil 64. Since i switched it to other pcie slot, now the vega 56 has a low hashrate.

[bubbagump]

Is it always the same slot that has the underperforming card?  Is it the same riser each time?  Also, did you try a different power supply?

[jimmy_007vn]

Is it always the same slot that has the underperforming card?  Is it the same riser each time?  Also, did you try a different power supply?

It's not always the same card. Every time i switch pcie slot, the underperforming card also switch. One thing i noted today, one of my cards always 15oC hotter then the rest of the rig. But today, i unplugged that card, the other 3 become weird. One card was mining at lower hashrate. one card became hotter. The last one was normal.