Posts made by sweater

[quote name=“RIPPEDDRAGON” post=“46192” timestamp=“1387469172”]Take a look at my power optimization thread: [url=http://forum.feathercoin.com/index.php/topic,4176.0.html]http://forum.feathercoin.com/index.php/topic,4176.0.html[/url]
I am working on a guide but that will help for now. I am so pissed my new Gigabyte R9 280xs are voltage locked…I am going to have to flash each of the 2 bios to different voltages, one for power optimization and the other for max hash rate.
[/quote]
This is good info to keep on hand. As for unlocking the voltage, I was a bit turned off by it and worried that I’d bork the ROMs on these cards until I followed that process ([url=http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/]http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/[/url]) and found out how easily it’s done. And very, very effective.

Finally moved the rig out to the garage to take advantage of the sub-freezing temps outside and only now begun tweaking settings. Running at a thread concurrency of 8192 and intensity of 13 I’m getting 675 at 70deg C without even trying hard. Seeing your guide I think I need to bump TC to 21000whatever or something, see if that works.

BUT I’M MUCH RECEIVING MANY DOGE AT THE MOMENT AND DON’T WANT TO TAKE THE DOWNTIME or whatever

• mike

[quote name=“Max.Wyght” post=“46290” timestamp=“1387486776”]what’re those red wires?[/quote]

Power leads / connections for the video cards. Most higher-end GPUs need aux power in addition to anything running over the PCI-e connection.

• mike

[quote name=“prensel” post=“45106” timestamp=“1387216163”]
What did you get out them when undervolting to 1.075V ?
What temps/fan speed ?
[/quote]
I haven’t been able to get the rig out to the garage (mid-40’s temps, more air flow) so I haven’t been able to really whip them yet.

And oddly enough, the exact same rom flash to all three cards yielded 1.075 on one card, 1.100 on the other two. Close enough, I’ll take it.

[b]Most importantly they’re stable[/b] running in the mid-500’s at low 70’s at something like 50-60% fan speed. Once I get a dedicated fan on these I’ll try to get them up to the high 600’s, low 700’s.

• mike

[quote name=“sweater” post=“44630” timestamp=“1387119457”]How exactly are people getting 700+ speeds out of this card while not hitting 85+ temps on these?[/quote]
Solved to a very large degree. I followed the undervolting procedure as described in this article:

[url=http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/]http://www.cryptobadger.com/2013/10/undervolting-in-linux-via-modified-bios/[/url]

Set all three cards to 1.075 (which actually yields 1.075, 1.100, and 1.100 for some reason) and now I’m seeing much more reasonable temps, better speeds, better stability.

• mike

[quote name=“Nutnut” post=“41710” timestamp=“1386525905”]
I think the gigabyte cards are a bit wobbly (struggling with stability) but then i am mixing 7970 & 280x on the same board. Maybe i’ll do a fresh build one day.[/quote]

As someone who was able to snag three of these cards, I’m now running into the fact that Gigabyte doesn’t easily let me undervolt these cards. Plainly put, I’m overheating them quickly running either Linux (13.10 works great!) or Win7. I’ve been able to undervolt some MSI 7950’s and get great performance out of them, but this problem is vexing me…

How exactly are people getting 700+ speeds out of this card while not hitting 85+ temps on these?

EDIT: ASRock 970 Extreme4, 1000w PS, 4gig RAM, Sempron 145, Win7 64bit, tried either Catalyst 13.9 or 13.11 beta. Have tried guiminer or cgminer.

• mike

Virtualization architect here, originally found out about mining using cpu mining (and 32-core VMs!) and have just transitioned over to gpu rigs.

• mike