What program are you using to change clocks?
What program do you use to verify at what clock is the GPU/mem running?
I'd suggest Hwinfo or GPU-Z to verify actual speed&memory speed

do you hava a Saphire card?

Please run also one of hwinfo or gpu-z for confirmation.
Trixx and AfterBurner sometimes incorrectly show current clock (both are simply same program, written by Unwinder, with different skins, customized for Saphire and MSI)
20MH/s seems way too good for 380 at 850/1125

PS: Then there could be possibility that somehow going down from 1500, memory is running with better/faster timings
Maybe running memory benchmark (Sandra?) will show bigger memcopy speed ?!

Dang... thank you for this.  I'm not new to mining but I am new to GPU mining and overclocking and I couldn't understand why my 380's hashrate wouldn't budge increasing the core clock but I found a nice little boost by upping the memclock to 1500.  After reading the thread you linked to, it makes sense now.  I think this card is doing best for me at 980/1500 on W764 with 15.12 drivers and CDM.

Yea, it's quite odd that it does it, but it doesn't bother me, can't complain about increase mh/s. I'm just glad to share what I found and the steps needed to replicate it =)

Edit: Can someone else besides a 380 card try the steps i mention to see if it show the same results?


Here you go restless



As you can see, with the undervolt and underclocking and reducing power limit, the power consumption is greatly reduced while still having a stable 20 mh/s.

On my screenshot, first 2 cards are powercooler 380x, and the rest are gigabyte 380.

If I run it at stock the VDDC power is around 80w, so since power consumption is important to me, lowering about 30w on the VDDC per card is good for me.

Hey guys,

I'm about to buy a 295x2 but still have some questions.

It's a Sapphire one.


What speed should it get with claymores miner on ETH only Windows 7? Do you think 60 MH/s is realistic?

What core clock, mem clock, voltage should I run it?

Anyone got a rough estimation of the power consumption for ETH only? My rough estimations tells me ~ 350 Watts under full load.

Is the stock hybrid cooler strong enough to hold the card below 75 degrees celsius?

@pikachuy could you teach me how you undervolt and clock your 380x? I'm looking for ways to get stable rates with lesser watts used.. thanks in advance =D

WHATEVER you do, don't use Sapphire for mining... It seems like everyone and their brother, sister, and mother, are having issues mining with Sapphire cards...

I thought with my R9 270's (2 of them) ~36MH would be my max. I haven't seen it yet.

I'm getting about 25MH/s Ethereum, about 380MH/s on Decred. I can get about 26MH/s in Eth only, but it's worth it to mine decred alongside ethereum. Keep in mind, that's considerably overclocked. Stock on mine is 900-925 Core Clock, 1400 Mem clock. I have it at 1050Mhz Core, 1500mhz Memory.


My two cards together probably use about 350 watts. I would think a 295x2 would use at LEAST 500 watts. Make sure you have a hefty power supply.

As for your expected mining speed... It's hard to really say. Two r9 270's are definitely more powerful than a single 290. So if I'm getting ~26MH/s, I'd imagine you'd get closer to 40. Maybe 45MH/s with a heavy overclock. But again, the problem is that I keep hearing nothing but complaints about Sapphire for mining...

Could you perhaps go with two R9 290's, non-Sapphire?

I don't want to hate on Sapphire. I used to have a passively-cooled HD5450 that I ran pretty hard. I now use it in my HTPC build. I love the thing, even now. But when you hear nothing but problems about a certain manufacturer in this particular usage... I can't help but recommend against it. I remember a thread on the ethereum forum where a guy had like 6 Sapphire cards for mining. Multiple failed within the first couple weeks. Not a good sign...

The bad cards were mainly 7950 with weak power stage design, which overheated and/or burned