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Have you tried running just 3 280x? Are you undervolting? Are they stock volts 1.2ish? Which CPU are you using? I know intel, but which chip? Which OS?
A stock volted / stock clocked 280x under load will pull 275-300w minimum.
If you are not undervolting i can virtually assure you 4 280xs + system are a bit much for any 1200/1250w unit, platinum or not.
The odd power cycling issues you describe would appear to indicate your PSU is balking at the load.
Generally, latest beta drivers / 13.12s + 2.9 SDK work well with the 280xs.
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Lookin' good overall.
A few notes:
I can confirm that board works with at least 5 cards as i am running 5 270s on it with no issues.
That FX4130 chip is a 125w monster (Zambezi core), just a FYI. Its Vishera equiv. is the 4300 which has a lower TDP.
You also may do better going with the x1-x16 powered risers, as the full length x16-x16 cables tend to be difficult to work with at times. I am running all x1-x16 risers on the board and at least 5 of the slots don't need a sense mod. I can't seem to get the 6th card up (yet), so there may be a slot that needs the full x16-x16 cable. You may be wise to get at least 1 x16-x16 powered cable if you do intend on expanding to more cards.
Once you get it assembled definitely check back in, preferably to this thread!
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It is a mistake to limit yourself to a singular coin. Do Middlecoin.
I've been gathering anywhere from .1 - .4 btc (rare, but happens!) a day with ~13.2mhs.
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hmmmmm
No bites on my FS post.
Are people actually buying these coins? heh
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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. |
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A hot-clocked 7950 will do 250w as a worst case, so you should be fine.
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well I completely removed the drivers and installed 13.4, app sdk 2.9, and tried cgminer 3.6.0, I'm getting around 300kh/s now. I wouldn't expect much more with the old core i3 cpu  thank you Most excellent. I must add that the 7850s i dealt with in the past loved core clocks in the 1000-1200 range with the ram pegged @ 1250. I could get 350-400khs with regularity, you may be able to get the same. I highly doubt your CPU is limiting you. |
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^^ 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. |
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Try these parameters: --gpu-platform 0 -d 0 --no-submit-stale --thread-concurrency 10048 --intensity 17 --worksize 256 -g 1 If those parameters do not work and you have the same 20khs, you need to wipe your driver platform clean using the CPanel add/remove program Catalyst uninstaller program. I highly recommend the Cat. 13.4 / 2.9 SDK combination. 12.6/12.8 + 2.9 should be fine as well. |
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^^ 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. |
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500 SMC up for sale.
PM me your offers.
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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. |
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Gazza1, true that. I'm guessing the OP got some nice Hynix cards or something  Samsung on the IC, did i get lucky? Anywhoo, Smartcoin is still going so no power figures yet. |
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addnode 198.199.106.114:58585
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Any idea on the power pull of each of those cards?
Great setup!
I am about to throw the killerwatt on it after this smartcoin launch, so i'll be updating this thread with those power numbers then. |
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GDDR6 cards starting @ 500GBs+ ram bandwidth would only sink Scrypt asics even further.
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nice hash rates /envy. I have two of those cards, however they seem to start to lose hash at 1070/1500 (753kh)
I'm also using sgminer + 8192.bin
Which OS / driver + SDK combo? Same bios rev as my cards? |
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That drive would work, yes. Anything over 32GB is safe. However, I always recommend SSDs over mechs. Yes, the SSDs are (a good bit) more expensive but they afford your rig far less downtime in the event you have to do IO work like reinstall drivers, OS, updates, ghosting, etc. I know you are maybe not going to go SSD, but my 3 go-to mining SSDs are: Kingston SSDNow V300, SanDisk SDSSDP-064G-G25 , and SanDisk Ultra Plus SDSSDHP-064G-G25. |
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