I knew this would drive up the price. MSI 280x are $499 now. lol.
In what universe? :O
seriously?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127759
Topic: 820KHs per 280x - Config + SS - page 2. (Read 15345 times)
In what universe? :O
seriously?
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127759
I knew this would drive up the price. MSI 280x are $499 now. lol.
In what universe? :O
I knew this would drive up the price. MSI 280x are $499 now. lol.
Has anyone else been able to do this on their MSI 280x's?
Has anyone else been able to do this on their MSI 280x's?
can anybody post the link for this version of rom?
Nice hashrate!
but the kh/w is meh for 280x's
but the kh/w is meh for 280x's
Surely can't wait for mine to come in now! Be next week but this is much better than the 720 I was looking at before! Nice job!
It's fine to use one PSU imo, I just had 2 of those lying around so why not. But with 2 PSU everything is rock solid stable and running for over a week with no issues what-so-ever.
I'll probably just buy two of the 1350W PSUs and then if the second one isn't needed, then I will just have to buy 4 more GPUs and build a second rig
It's fine to use one PSU imo, I just had 2 of those lying around so why not. But with 2 PSU everything is rock solid stable and running for over a week with no issues what-so-ever.
PSU are dual Seasonic 1000w platinum
Hmm...
Maybe I will just do that instead of trying to get it all to fit on one PSU. Seems like a little overkill on the cost vs hash ratio using two PSUs vs one. I was hoping to get all 4 of them powered on one of these:
http://www.newegg.com/Product/Product.aspx?Item=N82E16817194105
Thanks for all of the info. This will be my first new rig, so I am getting excited. I've just used 5000 and 6000 series cards on used motherboards and PSUs in the past. Hopefully all the endless hours of tweeking will come in handy
My rigs run at 750kh/s per card for a total of 3mh/s and are pulling 985W at the wall, and I think there is still room for more optimization. 
Would you mind sharing your settings and which cards you are using?
This is what I was hoping to acheive. I want to get 4 280x to run on a 1200W 80plus Platinum-rated Corsair PSU.
Just waiting on my paycheck next week to order the rest of the parts.
Sure, I'm running 4 x Asus 280x dc2t. Using MSI Afterburner undervolted core to 1.064v, clocks: 1050/1500
Using sgminer 4.0 and optimized scrypt130511Tahitiglg2tc8192w256l4.bin
Also undervolted/underclocked Sempron 145 to 1.1v @ 2GHz
PSU are dual Seasonic 1000w platinum
Looking at using Sapphire 280X Dual-X cards - anyone tried similar settings on these?
My rigs run at 750kh/s per card for a total of 3mh/s and are pulling 985W at the wall, and I think there is still room for more optimization.
Would you mind sharing your settings and which cards you are using?
This is what I was hoping to acheive. I want to get 4 280x to run on a 1200W 80plus Platinum-rated Corsair PSU.
Just waiting on my paycheck next week to order the rest of the parts.
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.
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.
My rigs run at 750kh/s per card for a total of 3mh/s and are pulling 985W at the wall, and I think there is still room for more optimization.
What PSU are you using? I am going to be ordering the parts to make my first 280x rig next week, but was thinking a 1350W was going to be enough... guess I need to think bigger!
SilverStone ST1500 1500w. I would highly recommend it. Very good unit for the price.
Thanks, mate! Going to order one now.
How long have you been running it continuously?
100% uptime (with 4). I've taken it down a couple times to mess with physical arrangements, but otherwise it's been rocksteady with 0 issues to speak of.
What PSU are you using? I am going to be ordering the parts to make my first 280x rig next week, but was thinking a 1350W was going to be enough... guess I need to think bigger!
SilverStone ST1500 1500w. I would highly recommend it. Very good unit for the price.
Thanks, mate! Going to order one now.
How long have you been running it continuously?
^^ That Silverstone unit is usually ~$329.99, not that 440+ you may be seeing right now. It's a solid unit with Nippon caps etc. Should be quite re-sellable.
I will certainly update this post if i can figure out a safe way to undervolt these cards!
I will certainly update this post if i can figure out a safe way to undervolt these cards!
I actually did buy 5 of the 280xs, and that 1500w would not handle all 5.
Theoretically, you could mod the bios (with vbe7) but after poking around and looking at all the softbrick reports it would appear that MSI did something within the bios framework that vbe7 is somehow messing up. The thing is, a new version of vbe7 may come out that has official support for the R9 2x cards and at that point your investment in the MSI cards will really shine. I say shine because that Samsung ram they have is golden!
Thanks for supplying that hopefully good news. Would you please update this post if at any stage you do manage to undervolt them. Also I cannot get over how expensive that PSU unit was. I really do hope it has good resale value...
Just to also say I bought a B Grade MSI Z77A-GD65 Intel Z77 motherboard for £70 and that included 8GB of Ram free with it. I take it, it being a completely different motherboard to what you have bought will not effect my attempt to match your hash rate.
What PSU are you using? I am going to be ordering the parts to make my first 280x rig next week, but was thinking a 1350W was going to be enough... guess I need to think bigger!
SilverStone ST1500 1500w. I would highly recommend it. Very good unit for the price.
What PSU are you using? I am going to be ordering the parts to make my first 280x rig next week, but was thinking a 1350W was going to be enough... guess I need to think bigger!
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.
I actually did buy 5 of the 280xs, and that 1500w would not handle all 5.
Theoretically, you could mod the bios (with vbe7) but after poking around and looking at all the softbrick reports it would appear that MSI did something within the bios framework that vbe7 is somehow messing up. The thing is, a new version of vbe7 may come out that has official support for the R9 2x cards and at that point your investment in the MSI cards will really shine. I say shine because that Samsung ram they have is golden!
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