Initial reports from reviews indicate that RX 480 draw considerable power from the PCI-E slot
(I'm talking about +75w, with short-term peaks of +100w)
Until we have some solid measurements under mining conditions, I would caution everyone to avoid using unpowered ribbon risers, since this is anywhere from 2-5x the wattage typical mining cards pull from PCI-E slot, more than double that drawn by a MSI 290X Lightning.
Hell, I would even caution against direct-mount triple card setups at this point.
RX480
82w average from PCI-E slothttp://www.tomshardware.com/reviews/amd-radeon-rx-480-polaris-10,4616-9.htmlMSI R9 290x Lightning
32w average from PCI-E slothttp://www.tomshardware.com/reviews/r9-290x-lightning-performance-review,3782-5.htmlSapphire R 380X Nitro
48w average from PCI-E slothttp://www.tomshardware.com/reviews/amd-radeon-r9-380x-nitro,4361-6.html
Comments
If your running off a consumer PSU I would not run more than 2 cards on 1 6 pin cable.
Next step: 480's . Tomorrow is the big day!
On topic: Powered risers will sort out that issue for sure!
That's the whole idea behind those powered risers.. don't overdue those pci-lanes
Will post some figures "hopefully" this weekend!
Greetings!
@Marvell9 I highly doubt Nanos are pulling 70-80w per card avg via the PCI-E slot like these RX480 do at stock.
6 cards may very well be 450w total being drawn through risers & their Molex (or worse, SATA adapters), quite a different situation from the cards we're used to in past generations that sip 10-30w through the PCI-E slot and get the bulk of their power via their 6/8pins
http://www.legitreviews.com/amd-radeon-rx-480-4gb-video-cards-8gb-memory_183548
And since same memory chips are used, i think overclocking the mem towards 9Gh is plausible.
I have few Powercolor's 4GB RX480 coming in in a few days... can someone dump a bios from 8GB version (preferably powercolor, but at this reference design point, i am sure any would work)? I'll try flashing one to 8GB
Please post how and when we can flash these to 8GB although as long as the speed is increasable to the that same as the 8GB why flash at all? or is the bios also limiting the speed?
Boysie
@weirdgod now I'm super sad I didn't manage to snag any 4GB cards. Appears they haven't been imported to a lot of places yet - but, at least I kinda get why now.
Are you willing to open the card and actually check wheter you got the 8gb of memory?
One way or another BIOS flash would cancel your warranty.
Got my RX480 today and just plugged in - installed the latest drivers and ran Claymore's dual miner.
Got a nice 24 hashrate at stock speeds, but after 3-4 mins, machine rebooted on it's own, and failed to post.
Removed the RX480, the machine still won't post
Wheeeeee - please use powered risers
I've been mining since January using unpowered risers with 3 x 280X, 1 x 7970 and 1 x 7990 with no issues whatsoever. But yeah with the new 480s i'm switching all the cards to powered.
unpwered risers are not worth the risk
@peepeedog Tahiti-based cards draw like 60-75% less through the PCI-E slot than a RX 480 does.
Swap 6x 7970 with 6x 480 and you literally quadruple the power draw via risers, even though you cut overall power usage by +30%
I mean shit... even using powered USB style risers, I'd imagine many have rigs with 3 risers off each modular molex strand, or which are using SATA power with those thin little adapters (rated for 20-25w iirc)
Anyhow, learnt my lesson!
Waiting for the replacement board and powered risers to come in, and perhaps we should all wait for AIB cards with beefier 8pin connections.
Cheers
Shaun
150W for the card with 75W from the slot, even with powered riser, it sound a little bit risky
Any sign of damage to the riser or board?
This was an X1 riser, perhaps the X16 might have survived. No physical signs that i can see, either on the board or the 1X connector. Most reports have it that the PCIE slot dies, but the other slots are working. In my case I can't even post - no bios, nothing at all. It goes into an infinite loop of restarting - fans spin up, nothing on screen, then shuts down after awhile - then repeat.
I've tried removing and replacing the battery on the mobo thinking it might clear the CMOS or something, but no luck there either.
It's an old H81 BTC Pro, so i'm not too fussed (plus my folly of running it off an unpowered PCIE slot). I've ordered the H97 anniversary, will test with that and report back.
At least AMD did come out to say something to the effect of acknowledging the issue.
Cheers
Shaun
As soon as the bios flashing software supporting Ellesmere becomes available, I'll be releasing a modified bios which makes the necessary changes automatically.
The procedure is rather simple, and can be done on any software which supports I2C control on Radeon graphics. Personally I recommend MSI Afterburner for the job.
- Download and install the newest MSI Afterburner
- Go to the installation folder of MSI Afterburner (where the MSIAfterburner.exe is located) and open a new command window ("Left Shift + Right Mouse Click" when no file is selected)
- Additional step: Verify that the I2C interface to the VRM controller is working by typing following command: "MSIAfterburner /ri06,08,0D" (without the quotes). If the response is ": 20" or ":44" you're good to go.
- The two commands you need to input are following: "MSIAfterburner /wi06,08,1E,BB" and "MSIAfterburner /wi06,08,1F,B0".
Once you have given these commands the power draw from the PCI-E slot has reduced and moved towards the PCI-E power connector. The recommended programming value is "B" (/wi06,08,1E,BB and /wi06,08,1F,B0), however you can go set it to anywhere between "B" and "F". Higher the value, more of the power draw will be directed to the PCI-E power connector.
Do note that this fix must be re-applied after every reboot.
EDIT: Added the I2C response for IR3567B controller (0x44).
IR3567A = 0x20.
The fix applies for both!
Shout out to the stilt!
Same with solar power and electric cars. That stuff is still expensive and will take time to make sense for everyday folks.
I'm actually glad that MORE POWER! for the sake of power race is over. No more 8ghz cpu's and 1000W power supplies at home.No more R9 295x2 burning cables and killing $20 power supplies.
I mean when I saw someone using 1kw supply for the first time I remember saying to myself 'why?'
Now we have an actual improvement where components perform better yet save almost 50% on electricity.
PS. Corsair RM850 gold is the most powerful PSU I have ever used and it looks like it will be the most powerful ever