820KHs per 280x - Config + SS - page 3.

Dannyboyni

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Quote from: atp1916 on January 29, 2014, 09:43:31 AM

If your electric is that cheap i say keep MSI cards. If you were paying US rates for elec i would definitely consider returning. Also, you will also not fit 6 280xs on a single 1500w unit unless you do some very serious undervolting.

Well you could run 5 cards on that power supply at least.

I take it there will be no way in the future to undervolt the MSI cards.

And alphacenturion, it seems its only the msi cards which are in stock in the whole of the uk. No luck finding any of the others anywhere else.

atp1916

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Quote from: Dannyboyni on January 29, 2014, 09:23:45 AM

I have just purchased 4 of the MSI Radeon R9 280X Gaming Edition cards along with the Silverstone strider 1500 watt PSU from Overclockers. Having read about how much power they consume and having spent so much money on the power supply I am very disappointed in my decision to purchase them.

Now I have two options I am considering, I either send them back and buy the 6 of the Sapphire Radeon R9 280X toxic which Amph suggested to buy. The reason I would buy 6 cards instead of 4 is because I have spent the money on the 1500 watt PSU so I may as well make use of it. It should be powerful enough to run 6 of the Sapphire Radeon R9 280X Toxic cards shouldn't it?

My other option is to keep the cards and just live with the higher power costs.

One thing to keep in mind my for my decision is that I can purchase my electricity at 7p a unit, which is half the price of what most people would be paying.

So guys which option should I choose?

If your electric is that cheap i say keep MSI cards. If you were paying US rates for elec i would definitely consider returning. Also, you will also not fit 6 280xs on a single 1500w unit unless you do some very serious undervolting.

alphacenturion

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Activity: 114

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I've just done the same as you purchased from overclockers today in fact except I bought 3 of them and a 1250w Seasonic. I wanted the Asus ideally as the Toxic runs so hot but the MSI was the best bet as nothing is available here in the UK for a reasonable price, they are stack at least £50 on the RRP and that all adds up when you're buying several cards. I'm going to stick with mine and see how it goes.

Dannyboyni

newbie

Activity: 4

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I have just purchased 4 of the MSI Radeon R9 280X Gaming Edition cards along with the Silverstone strider 1500 watt PSU from Overclockers. Having read about how much power they consume and having spent so much money on the power supply I am very disappointed in my decision to purchase them.

Now I have two options I am considering, I either send them back and buy the 6 of the Sapphire Radeon R9 280X toxic which Amph suggested to buy. The reason I would buy 6 cards instead of 4 is because I have spent the money on the 1500 watt PSU so I may as well make use of it. It should be powerful enough to run 6 of the Sapphire Radeon R9 280X Toxic cards shouldn't it?

My other option is to keep the cards and just live with the higher power costs.

One thing to keep in mind my for my decision is that I can purchase my electricity at 7p a unit, which is half the price of what most people would be paying.

So guys which option should I choose?

Victoo

sr. member

Activity: 393

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Show us the hash rate.

nonny12

sr. member

Activity: 362

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Quote from: KlimBo_BG on January 28, 2014, 11:57:42 AM

Where to find this optimized .bin file?

I found them in the reddit comments for sgminer. I'm not sure if these are the same ones OP is referring to.

http://www.reddit.com/r/litecoinmining/comments/1va8g2/ann_sgminer_400_release/ceqvjwn

KlimBo_BG

newbie

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Where to find this optimized .bin file?

bjoern1978

member

Activity: 133

Merit: 10

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

Amph

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Quote from: crazyates on January 27, 2014, 10:04:25 PM

Quote from: atp1916 on January 27, 2014, 09:52:54 PM

^^ 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

atp1916

legendary

Activity: 854

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Quote from: dima_a123 on January 28, 2014, 03:48:43 AM

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.

Quote from: minermob on January 28, 2014, 04:23:29 AM

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.

minermob

newbie

Activity: 28

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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.

dima_a123

member

Activity: 109

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

atp1916

legendary

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Quote from: crazyates on January 27, 2014, 10:04:25 PM

Quote from: atp1916 on January 27, 2014, 09:52:54 PM

^^ 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.

CrimsonGT

full member

Activity: 462

Merit: 100

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

crazyates

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Activity: 952

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Quote from: atp1916 on January 27, 2014, 09:52:54 PM

^^ Which make/model R9 280x?

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

atp1916

legendary

Activity: 854

Merit: 1000

^^ 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. Grin

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

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Quote from: atp1916 on January 27, 2014, 07:10:42 PM

In regards to the wattage: Very high.

Being locked at 1.2v (thanks MSI Roll Eyes

), 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

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In regards to the wattage: Very high.

Being locked at 1.2v (thanks MSI Roll Eyes

), 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.

madjules007

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Quote from: Gazza1 on January 27, 2014, 05:30:41 PM

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. Cheesy

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?

Gazza1

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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. Cheesy

Topic: 820KHs per 280x - Config + SS - page 3. (Read 15373 times)