Topic: Who ordered the AMD Radeon VII? Lets make a list of Miners / Hashrates / Coins - page 5. (Read 12978 times)

Mining xmr currently @ 1550/1200/0.858 (w/o particularly detailed tuning.)  Same voltage for eth, but different clocks.

What is the lowest stable voltage that you guys are using for mining Eth (or XMR)? I have lowered it down to 1.0 (1.17 originally) so far but I haven't tried to go below that yet.

I use a cheap ass 1600W Chinese mining PSU which costs $80 and run 6 Vegas on it without any problems. Of course, buying any no-name Chinese PSUs online is a hit or miss thing. Best to be able to physically look and touch the cables and connectors first before buying them. That way, you will be able to know if the wires and connectors are rated for the said wattage or not. I have one blow up in my face once and another emitting high EMI to the point it disrupted my video signal. But at $80 or lower, it was a risk worth taking. 

Not just this card. But no, why should you aim for best hashrate, not the most efficient? You'll get more returns after your electicity bill if you aim for efficency.

Hey all, as BTC price has been increasing, daily earning with Vii have been slightly increasing also.
Do you think it's still worth to push these cards to the highest limit possible; DaggerHashimoto @ 91 MH/s . Earnings go to around £1.90-£2 each GPU.
But the temp also increases to around 95-100 degrees.
I know it would be very bad in the long term and the lifespan won't be much long.

did anyone ever figure out best memory timing settings using AMD Mem Tweak tool?

It's unfortunate how tenacious this 'common wisdom' is.  Maybe it was translated from home wiring circuits (where it's def important to maintain 20% headroom when talking about sustained loads,) or it's from older/cheaper/lower-end PSUs w/ more bell-shaped curves, but current high end PSUs have no issue running at capacity.  In fact the graph you pasted shows measurements up to 12.5% above cap - though I wouldn't necessarily test that w/ a 24/7 load.  

As to the efficiency and power use concern, peak eff is around 33% of cap - that would be insane to leave so much unused cap.  Assuming 75-80% is the guideline as suggested, you're talking about maybe a 2% eff drop between that level and full cap.  Which assuming a $0.1/kwh power rate translates into:

((1600 * .02) / 1000) * 0.1 * 24 * 365 = $28

That's $28 per year in extra energy cost by fully utilizing your PSU vs handicapping it at 80%.  Even if you double that (splitting the load will get closer to peak on each PSU,) given that that the AX1600i runs about $470 new, and the avg lifespan of electronics is 3-5 yrs, it's clearly much more financially prudent to simply utilize the full potential of the PSU.

Also, if someone is really worried about a reset-situation kicking the GPUs back to stock, they should just use PPTs.  Although even w/o that, the over-current protection of the PSU will handle what should be a rare occurrence anyway.


I found 1575 cclock was roughly the line for 935 mclock in my case.  Though this was a while ago, on an early bios and older drivers.

I finally wound up ordering one today; hopefully I can have it installed in time to tinker with this weekend.  It will be in a multi use PC so hopefully I can get multiple profiles set up for convenience sake.

I currently have 3 Radeon VII's mining Monero with TRM 0.5.2, core 1500MHz @ 875mV, HBM 1050MHz. Total system average 8434H/s pulling 550W from the wall (this is no estimate, but actual metered powerconsumption).

All these people having PSU issues in this thread, it's like they've never built a system using 300 watt stock tbp gpus before.

How to size PSUs:

Step 1 - Add up the stock power of all of your gpus.

Step 2 - Divide by 0.8 so that if your OCs get reset and you don't notice you've sized to pull no more than 80% of the psu's rated power.

Step 3 - Take the combined power of your power supplies and make sure your wall socket can provide 15-25% more power than that without tripping the breaker.

Example:

You want a system with a cheap mobo + 4 Radeon VII gpus.

Step 1 - Power Draw = 60 watts (mobo) + 300 watts (gpu) x 4 = 1260 watts

Step 2 - 1260 / 0.8 = 1575 watts, or we need a PSU rated for 1600 watts or higher.

Step 3 - 1600 watts power draw * 1.25 = 2000 watts.  2000 watts / 110vac (rms) = 18 amps, or you need a 20 amp breaker dedicated to just this 1600 watt psu, powering just four Radeon VII gpus.


You really don't want to be maxing your psus out anyway for efficiency sake, you're burning more power by not running closer to the peak of the psu's efficiency curve.
https://i.imgur.com/wBkTB9S.jpg



On another topic, I've found that for ethash the point at which the gpu core no longer bottlenecks the memory on this gpu to be when the gpu clock is about 1.8-1.83x the memory clock.  Or 1800mhz core for 1000mhz mem, or 1620mhz for 900mhz mem.  Is everyone seeing similar in their fiddling?

PSU problems perhaps?

Try them 1 by 1 on the mobo to see if they are working or not.

I have 4 dead Radeon VIIs.  After I rebooted my rig 4 of 8 Radeon VIIs would not hash or show u in in SimpleOS.  I replaced riser, replaced the psu and tried plugin one straight into the modo and nothing.  I'm running out of ideas, could I have cooked 4 crads?  They ran fine for a 6 weeks around 83 degrees.  No idea why 4 cards would stop working after a reboot.

Awesome results!

Depends what algo you run. Ethereum is 215W for 82 MH/s, 245W for 89 MH/s or 300W for stock settings.

What is the power consumption on the new radeon VII, optimized or standard settings?

Hi there, can someone tell me how to configure SRB miner or XMR stack for Vega VII. Mine arrived today. For SRB miner on do you want to use double threads I put yes but I dont see double threds i am mining with 1400 hashes, please help me

Yeah what I hear over the forum (and popular YT commenters, such as Bitsbetrippin'), Corsair no longer makes quality power supplies that last. People have been moving to Thermaltake Toughpower and EVGA Supernova. I've personally have had no issues with EVGA or Thermaltake.

Also, the longer the extension cord, the more the voltage drop and higher amps needed for same wattage (which doesn't charge if you're mining with same setup).

A continuous load (e.g. a 24/7 mining rig) should generally be held to 80% of a circuits nominal rating.  That 15a rating is for transient / short-term loads.  For instance, I have a ‘20a’ PDU which is already derated to 16a to enforce this ‘rule’.

Also, not all extension cords are equal.  You should look for high amp/power cords - ‘heavy duty’, prob 12g or 10g wiring, and no longer than necessary (typically used for large outdoor/construction equipment like saws.)