Vesper,
I was all over the 270 bandwagon... but not sure now... I finally got a good power meter and I have a set of Sapphire Dual-X's that are runnning 1.5Mh/s at 630W including 80W for the system... that is 275W per card... they are under-volted to 1.187... and I think I could get them as low as 1.160 and keep that hash-rate.
With my 5 card test unit, I really like the power savings (almost 100w) over my other rigs, and it's providing 200-400kh more on average as well. With the Prolimatech aftermarket coolers, I bet the power savings would be another 20-60 watts. For the watt/hash, these are surprising results, but the variance is noticeable, and I'm not sure how "Stable" the system is yet. I've had it running like this for a few hours. Will know for sure when I wake up in the morning.
Of the 5 I have running right now, 2 of them at any given time are at 490-492, with 2 more varying 485-492, and one of them perpetually 480-485. Varies constantly. Power usage remains about the same, 975-985 watts, which puts it in the 175-180w range for each. When i go back downstairs to the test rack I'll glance at the meter again.
The Sapphire and Powercolor have been the most rock-solid stable on an individual basis, with the visiontek doing a great job speed-wise but with some slight variance. I'd order them again in a heartbeat though for the right price.
I think I'm just pushing the motherboard/riser combo to the limit. No cooling issues so far. I have USB risers coming this week, I'll see if that makes a difference. FWIW, all 5 are using the same gpu settings, I'll share below.
EDIT - HURRAY!!!! I finally got BAMT running!!! I have a bald patch!!!
Congrats! Hope it works well for you, let me know if I can help.
@vesperwillow, what PSU(s) are you using?
Depends on the rack and rig. I use a mix of Seasonic 850 Gold Plus and 850 Platinum, Corsair 1050HX & AX series, Thermaltake TPG-1050M. I've had no issues with these guys yet. Guess I've had good luck so far. I also have 1 Raidmax RX-1000AE which just died after 3 months of use. Lifetime warranty on it so I'll talk to them. I got it for $79 so I can't complain much.
@vesperwillow, mind listing the complete specs of your 270 rig? And maybe I can buy those parts either locally or that guy in Taiwan. Mark just replied to me that he priced his rig incorrectly, hehe. (No wonder it looked like a good deal.) In any case, I offered to just buy the GPUs at the "correct" price if he's still inclined to sell them, since they aren't being used anyway.
For the 270X test rig, it's pretty much the same as all of my others, usually the only difference is PSU. Here it is:
ASRock 970 EX4
2gb DDR ram (Kingston HyperX or Corsair XMMS, whichever is cheaper)
AMD Sempron 145
ADATA 3.0 8gb USB stick
PSU: Thermaltake TPG-1050M
1x PowerColor AXR9 270X 2gb
1x Sapphire Dual-X R9 270X 2gb
3x VisionTek R9 270X 2gb
Software: BAMT 1.2, Cgminer 3.7.2
GPU Settings:
"intensity" : "20,20,20,20,20",
"worksize" : "256",
"kernel" : "scrypt",
"thread-concurrency" : "24000,24000,24000,24000,24000",
"api-port" : "4028",
"expiry" : "120",
"gpu-engine" : "1145",
"gpu-memclock" : "1500",
"gpu-powertune" : "20,20,20,20,20,20",
"temp-overheat":"87",
"temp-target":"60",
"log" : "5",
"no-pool-disable" : true,
"queue" : "1",
"scan-time" : "60",
"scrypt" : true,
"shares" : "0",
"kernel-path" : "/usr/local/bin"
You could ignore the redundant intensity/powertune/tc settings, I just left that from when I was doing individual tuning.
Oh, I almost forgot to mention, welcome home, 24Kilo. Good seeing you on the top 15 list, beating Vesper too lol.
Yes indeed! I saw the challenge he put out, I love it. Oh wait, what's this.. I'm ahead? Not for long I bet lol..
Question for everyone in the US... does anyone know a source to buy Newegg gift cards with BTC? As much as I hate them after their BS with cancelling my orders 3 times, they have stock in some gear I want to buy.
Second question... anyone have any experience with ordering items o Amazon that say something like "item ships in 2-5 weeks"? Just wondering how accurate that measure is.
-Fuse
No and No. There's stuff I'd love to buy from Newegg right now.. wish I knew a way to go BTC-> Newegg as well. LMK..
As to Amazon's, I talked to a lady the other day from amazon, she said when it shows that it means it's an item they don't often carry high stock on, so when you place your order, they will then order the item from the distributor. My gut feeling was to not even try since the distributor was probably bone dry. I could be wrong, but I just didn't want to tie money up.
As it is I have money tied up with a TOXIC order which is likely never to be fulfilled. At this point I just want to sell the card for a profit to buy more 270x's, but I'll probably just end up cancelling the order if it doesn't ship this week.
The good news is I think a fresh shipment of some cards may be on its way as the factory seemed to have gotten some more 270's in stock..