820KHs per 280x - Config + SS

[kikeda]

Thank You! ill probably experiment with it.

[hashfastmining]

will try that today... got a 280x dc2 

[Gazza1]

4 min is long enough to stabilize.  My rigs take 10-20 or so seconds.  If your hashrates are going down after 4 minutes it's because your cards are throttling.

[mrugala]

watt usage per card pls?

[La_boutique_du_mineur]

watt usage per card pls?

+1

[SheepOnDrugs]

Would also like to see the watt usage of your cards.
Would be interesting if they would still run stable at 1.084

[Gazza1]

My guess is the voltage is over 1.2.  Possibly 1.256.  I could be wrong.  My 7970s weren't stable over 1135 without going over 1.2vddc.

I haven't tried yet on my 280x's, I couldn't get it to build on Linux and I've been slackin

That's still fantastic though.  If one can keep the cards cool I'm definitely going to do it, at least while it's cold.  Summer I'll probably have to volt back down to 1.019 with 1050/1500 @ 740's which is still freakin awesome given the tremendous temp/power drop.

This has me seriously considering to get those cards for my next rigs.  I was going to get 290s.  Now I'm uncertain.  I wonder what 290s can run now with sgminer given the right tweaking.  

[madjules007]

My guess is the voltage is over 1.2.  Possibly 1.256.  I could be wrong.  My 7970s weren't stable over 1135 without going over 1.2vddc.

I haven't tried yet on my 280x's, I couldn't get it to build on Linux and I've been slackin

That's still fantastic though.  If one can keep the cards cool I'm definitely going to do it, at least while it's cold.  Summer I'll probably have to volt back down to 1.019 with 1050/1500 @ 740's which is still freakin awesome given the tremendous temp/power drop.

This has me seriously considering to get those cards for my next rigs.  I was going to get 290s.  Now I'm uncertain.  I wonder what 290s can run now with sgminer given the right tweaking.  

Which 280x's are these? I have 4x Sapphire dual-x. I can't seem to get much lower than 1.130 (Trixx) without the drivers crashing (@ 1050/1500). Don't know if this would work better with a BIOS undervolt?

[atp1916]

In regards to the wattage:  Very high.  

Being locked at 1.2v (thanks MSI  ), Killer-watt indicated the entire rig in that screenshot was pulling 1365w from the wall (on a 1500w PSU).  Minus the ~140w idle from the system, that's good for ~1300 for the 4 cards = 325-330w per card.  Certainly not optimal, and missing the 3:1 khs/watt mark i strive for.  It's big khs, but also big power.  They are basically mini-290s.

Will do more testing later, but being volt-locked maintaining 3:1 khs/watt will be tough.  I would be very, very careful attempting vbe7 bios modding with these R9 cards.  I know they are basically 7xxx architecture, but there's too many brick reports to just plow ahead and mod/flash.

Adding the power quotes to the OP for future reference.

[crazyates]

In regards to the wattage:  Very high.  

Being locked at 1.2v (thanks MSI  ), Killer-watt indicated the entire rig in that screenshot was pulling 1365w from the wall (on a 1500w PSU).  Minus the ~140w idle from the system, that's good for ~1300 for the 4 cards = 325-330w per card.  Certainly not optimal, and missing the 3:1 khs/watt mark i strive for.  It's big khs, but also big power.  They are basically mini-290s.

Will do more testing later, but being volt-locked maintaining 3:1 khs/watt will be tough.  I would be very, very careful attempting vbe7 bios modding with these R9 cards.  I know they are basically 7xxx architecture, but there's too many brick reports to just plow ahead and mod/flash.

Ouch. Our 280x rigs are undervolted, and pull 1250W at the wall for 5 cards! We're sitting at under 230W/GPU, but we're only getting ~725KHs/GPU.

And yes, all of those R9 280x were undervolted with VBE7.

EDIT: A 100KH/s gain at the expense of adding 100W is still more profitable, but only slightly. You're talking about about $30 of increased revenue over the course of a month, with only about $10-20 of that being profit (after electric costs). Add the costs of buying larger PSUs, and the fact that you won't be able to undervolt much at those high clock speeds, and the increased temps (80C vs 60C), and you might want to reconsider.

[atp1916]

^^ Which make/model R9 280x?

I am not entirely sure what i'm gonna do with these.  Prolly keep em running.

Perhaps i will keep telling myself they are 290s in disguise then the power draw doesn't look so bad.  

The funny thing is that they kept scaling with more core with the memory @ 1500.  They weren't stable, but @ 1210 core / 1500 ram I was cleanly over 840khs on all 4.

[crazyates]

^^ Which make/model R9 280x?

Gigabyte 280x WF3. 1040/1500 = ~725KH/s, and 1.01V = >230W/GPU.

[CrimsonGT]

Couldn't ever get this to work any better for me. I get around 725 kh/s on CGMiner. SGMiner with/without the optimized bin only gave me about 700 at most.

Sapphire R9 280X Dual-X

[atp1916]

^^ Which make/model R9 280x?

Gigabyte 280x WF3. 1040/1500 = ~725KH/s, and 1.01V = >230W/GPU.

Gah, figures.  Good ole Gigabyte WF3s.  Oh well.

[dima_a123]

I see these cards are about 80C temperature, what is VRM temperature on these cards running 820 kh/s?

[minermob]

I've been able to pull similar KH's out of my unlocked sapphires, but the temps are simply too hot for me to justify the increase in KH's.

Just my two cents.

[atp1916]

I see these cards are about 80C temperature, what is VRM temperature on these cards running 820 kh/s?

The VRMs are apx 82-87c as a range across the cards.  Kinda warm.  Am watching them.

I've been able to pull similar KH's out of my unlocked sapphires, but the temps are simply too hot for me to justify the increase in KH's.

Just my two cents.

Yep.  In the summer I am gonna need to get creative or just downclock.  

[Amph]

^^ Which make/model R9 280x?

Gigabyte 280x WF3. 1040/1500 = ~725KH/s, and 1.01V = >230W/GPU.

280x toxic is even better

180/1500 = 750kh/s 1.000v


@atp1916

820 kh/s at 1.25v is not worth it mate, better at 750 but with 1.000-1050v = -80w from the wall

[bjoern1978]

i have 2  sapphire vapor X R9 280x
both @ about 730 kh

1050/1500 @1,1 v

cgminer --scrypt -I 13 -g 2 -w 256 --shaders 2048 --thread-concurrency 8192 --gpu-engine 1050 --gpu-memclock 1500 --gpu-vddc 1.100 --gpu-fan 90 --gpu-powertune 20 --lookup-gap 2 -o pool -u user -p x --failover-only -o pool -u user -p x

[KlimBo_BG]

Where to find this optimized .bin file?