Hi
I have recently setup a rig to mine litecoins and various other altcoin, I started with one Sapphire Vapor X R9 280X which worked fine and I easily managed to get it to around 730 kh/s and undervolting led to my system using about 315 watts. All was good so I decided to buy another of the same video cards, finally tracked one down and installed it but using the same settings led to different results
http://s25.postimg.org/5re2ddc6n/cgminer.gifThe new card seems to run hotter and get less kh/s it's really letting the team down. So I started looking at what may be different about the two cards and found they had different two different BIOS's and the only other difference I could find was the part number on the card itself, The good one part number is 299-5E210-004SA and the bad one is 299-6E210-004SA
http://s25.postimg.org/ffrigi6zz/Specs.gifSo I thought it must be bios version so after much googling and not finding much I pushed the button to enable the UEFI bios and wrote over it with the bios of the good card but after that it would not boot up so I had to revert back to the original bios.
So I looked into it further and noticed some interesting things in GPU-Z
http://s25.postimg.org/5txy07fu7/Sensors.gifI noticed the GPU core clock is very up and down and the VDDC is all over the place also the VRM temp is at 108 degrees!
I was hoping someone with more knowledge of this stuff would be able to help me out is this card faulty? Should I be taking it back to the shop just got it a couple of days ago. I don't like my chances on getting a replacement though.
