I used the bios that he made for this card and posted here. Luckily, LitecoinTalk user The Stilt over here has created an edited version of the bios that helps with this throttling. This left me initially with a hashrate of around 700 KH/s. This is partly due to a new vrm that isn't as good as the old one. If you do a deeper search on google, you'll notice that these cards have problems with vrm overheating that causes them to throttle. Unfortunately, the newer version is not capable of sustaining the stable undervolts and high hashrates that the previous revision is capable of. Sapphire recently created a new revision of this card that can be identified by a newer bios (15.041). Unfortunately, not all of these things are true anymore for the sapphire dual-x 280x. Sapphire 280x Dual-x I'm sure many of you have read great things about sapphire branded 280x amd cards after a cursory search on google. I have had both an MSI gaming 280x and 5 Sapphire dual-x 280x's for about a month now and I thought I'd share some of my experiences with these cards. These cards have the benefits of achieving one of the best $/KH (300/700) ratios around if you can find it at MSRP ($300), is pretty power efficient (200-250 W), and it provides more KH per pcie slot than the 270 or 270x, which means decreased overhead. Some of you might be considering buying, or already have, bought r9 280x's.
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