I have two 480s I'm thinking of switching over to XMR. Anyone mining on them and if so what are your settings for claymore's miner? I'm getting really low hashrates compared to what everyone says I should be.
Good question, and I'm glad you brought this thread back up actually. ETH mining may go out the window sometime in the next 6-12 months depending on how well-received FFG is (which is on a testnet now) so XMR mining may be the best haven for most ETH miners in the future.
Unless you're getting 800h/s already there's no point in optimizing the Claymore settings, just run with the default since the bottleneck is elsewhere (driver config or memory settings). Anyone getting 350-400h/s on 480/580 should check whether Compute mode is enabled or reinstall proper drivers. Stock 580 should do 500-600h/s with default settings on any miner. I strongly recommend latest Compute capable driver since the Aug Blockchain driver has some issues with lowering chip voltage on some big Polaris cards, and it's a pitty to run at 1.1V when 950mV or even 850-875mV is possible.
I had one 580 8GB running on Claymore 9.7, then Claymore 10.2 and then XMR Stak after more testing. Claymore 10.2 seems to offer better hashrates over 9.7 and XMR Stak, but in my experience locally reported hashrates did not reflect in long (24h-48h) averages on the pool side. After trying different settings and combinations I moved to XMR Stak which reports lower local hashrates... but they reflect properly on the pool side. On Claymore I tried settings between -h 1800 and 1890, anything beyond that seems to use too much VRAM so performance drops.
The 580 with modded straps or mining BIOS straight from the vendor does 800h/s with as low as 1Ghz GPU clock. If you don't care about power usage and have Samsung memory you might push towards 1000h/s, though this was never my aim since I'm trying to stay within 1050Mhz and 850mV.
PS: if you try out XMR Stak, take note it has the habit of occasionally crashing the driver when exiting the application, the only workaround I know ATM is to disable the network adapter: the miner will automatically idle and become safe to close.