Quote from: elchorizo on February 26, 2014, 04:17:34 AM

Quote from: Kergekoin on February 25, 2014, 09:04:05 AM

Quote from: N[e]wBie on February 25, 2014, 08:36:25 AM

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You should be able to get 800+ on those cards each.

settings, please? I can't get over 740 with mine, MSI has been a much better performer for me than sapphire dual-x or gigabyte windforce

Dont belive every troll who doesnt know shit.

Your cards generally are not able to do clocks which are needed for 800+khs. You need minimum 1160/1800 for that.
Besides, pushing 280x to its limits not even closely efficent anymore. Those cards will consume way over 280W each and will be insanely hot when you push them like that. As a result fans would not survive over 3 months. Its a common flaw of several cards, If fans are running high rpms.

Quote from: HellDiverUK on February 25, 2014, 12:15:22 PM

Quote from: N[e]wBie on February 25, 2014, 08:36:25 AM

Quote

You should be able to get 800+ on those cards each.

settings, please? I can't get over 740 with mine, MSI has been a much better performer for me than sapphire dual-x or gigabyte windforce

800+ is impossible. My elcheapo MSI 280X only gets 688kH, because it's crappy core only does 980MHz stable. 720kH is the normal top-end speed of these cards, 800kH is a drug-induced hallucination.

It is possible and I've been doing it with multiple rigs for a long time now. You should really do some research... I do overclock the cards but there is nothing wrong with that. Also please note, I undervolt them before I overclock them even Wink

They run cool... just fine.

https://litecointalk.org/index.php?topic=14339.msg111704#msg111704

All my settings, screenshots, etc. are there. I have a 6 card rig and a 4 card rig running similarly.

Getting the proper BIOS flash, then undervolting it are great ways to get good kh/s and run on less power. You should be able to use the same BIOS on your cards that I'm using on mine...

This image below is old and was taken after the rig was running for 24 hours...

http://i.imgur.com/toObVGh.jpg

This image below shows sgminer which has been running for 12 days or so... so don't tell me about stability. Its also in a room with a pretty hot ambient temperature and you can see the cards are staying plenty cool..

http://i.imgur.com/lkqeeG6.jpg

and.... one more pic.

http://i.imgur.com/KX2lzgJ.png

What model of the 280X cards these are? And which bios did you use ?