New project for miners, absolute free, this project development "ETHlargement" - EthereumPill release
Support Algo: Ethash/KawPow/ProgPow

More info: https://github.com/ProjectEthereumPill/EthereumPill/releases/tag/1.1.0

Hashrate:
1080ti - 58 mh/s
2060 - 59 mh/s
2070 - 60-62 mh/s
2080 - 63-67 mh/s
2080ti - 68-71 mh/s
3070 - 76-78 mh/s
3080 - 97-99 mh/s
3090 - 115-127 mh/s

P.S.: the project is being drowned by competitors, don't trust anyone, check the information yourself

so, I'm on windows 10, I have the Adrenaline 20.4.2 driver and an RX Vega 56, claymore's mining is working fine.. but kawpowminer gives me the error 'kawpowminer 1.2.2+commit.04710414
Build: windows/release/msvc

No OpenCL platforms found
Error: No usable mining devices found'
I'm launching it with 'kawpowminer.exe -G -P stratum+tcp://<snip>@<snip>'
what exactly am I doing wrong here?

If you were trying to change memory freq. on GCN1 cards, some of them have driver-capped frequencies, but upping core frequency on my 7850 with some timing improvements got me more on ethash than just one or the other. My R9 290s were mostly core limited on ethash so didn't bother with OCing memory, but I did see some small improvements on I believe cryptonight variants with tightened timings. Maybe c29 too, not sure about that one.

HiveOS won't spin up the fans on my Hawaii cards, but SMOS is working with it, so I very much suggest SMOS over HiveOS for GCN1 and GCN2 cards. I personally used Hawaii Bios Editor to change clocks/volts/fan curve on my 290s, and also a hex editor to change memory straps a little, but I changed when they change over rather than copying lower tier up (I was doing it for benchmarking purposes with firestrike, not mining.). I use VBE7, anorak's tools, and a hex editor for my 7850, I believe it works on the GCN1 refreshes too, I'd have to grab a vbios off of techpowerup to check if it handles it right.
edit: also to change DPM on a per-card basis on SMOS, you need to use ssh and unless you want to su to root, make a .sh file containing something like "echo "7" > /sys/class/drm/card1/device/pp_dpm_sclk " that will set a DPM level of 7 to the second card in the system,as the first card is card0. needs to be a .sh file run with sudo because the ">" happens to break sudo, applying to echo but not opening of the "file" so it can't write to it, while making it a .sh file to run has sudo apply to everything in it. I currently don't have a refresh of the GCN1 cards to test how their powerplay settings are in vbios. my 7850 doesn't seem to really have a full DPM profile in the vbios and I can only set maximums, which it runs at by default so I don't know how 270(x) or 280(x)s would behave in that regard. Also, sorry if I ramble a bit too much.

SMOS, lolminer 0.8.5, AMD FX-6300. I don't think lolminer can do it with 4gb cards on windows 10, so yes linux only.

I have 2 R9 290s,mining grin one does 2.5Gps, another does 2.77, I'll be trying to figure that out later. It's lower power than eth, but I'm not sure by how much as my kill-a-watt is dead. It will work on linux (tested with SMOS myself), it might work on windows 7, but not windows 10. On Linux you can get 27-31MH/s on ethash (vs the 20-24 on windows) too. My experience mining cryptonight variants on my 290s has been.. well I'm only getting 700 or so H/s. Grin was definitely making me more profit, and eth classic making the most revenue and maybe profit. You need to use Hawaii Bios Editor to do any overclocking/undervolting you want if using them on linux.
edit: lolminer is miner to use for grin on AMD.
edit2: Less typical or efficient algos the 290s can do are: the equihash variants, like zhash, BEAM, and I believe Aion but I didn't test that one myself. I believe mine were outperforming my RX 580 on BEAM, too, but I've only tested on linux. Windows 7 may work the same even though it doesn't get the memory management benefits of linux, where the ethash performance difference comes from. They can do the C31 algo, for grin, as well with lolminer but only at .27 gps, though they ran fairly cool when mining that so power efficiency may be better there.

it just works on SMOS, except the only clock/voltage control is DPM states, makes the occasional finickiness of ubuntu less of a problem. I personally used Hawaii Bios Editor to tweak the states so it behaves a bit better.
My 290's are getting between 2.5 and 2.77 on cuckarood29 with lolminer, and 28-30 on ethash. c29 is much cooler running than ethash.

I mentioned previously FGLRX has the problem with thrashing, AMDGPU-PRO doesn't. Also, Pitcairn is much much lower power design than Tahiti. Same process node, but the 7850s were only 120W TDP cards. Not sure if they had theirs modified to get the lower power. (VBE7  can adjust frequency/voltage settings on GCN1 cards vbioses, but amdgpu ignores any memory setting above 1250mhz and caps it there on Pitcairn, there's a file in the opensource side of the amdgpu-pro driver specifying "quirks" that needs modified and recompiled to OC past that)
EDIT: Also, I had some trouble getting amdgpu-pro to work with that 7850 on vanilla unmodified ubuntu besides installing amdgpu-pro myself last year, it'd only enable less than half of the memory and 8CUs, so I've been exclusively using SMOS, which is derived from ubuntu, to test it. I probably should check the state of things now

I'm using phoenixminer myself. I found it odd that I've only found 1 other person that seemed to realize the old GCN1 and GCN2 cards work so much better on (modern) linux for pure stock, and they were mining ubiq on a rack's worth of the same powercolor HD 7850 I have, tuned to ~90W and 17MH/s. I have yet to see how Tahiti cards do, but I really want to know now that I've seen Pitcairn and Hawaii do so well.

One of my R9 290s is mining ETC at 29.8 right now, on SMOS. 1040 core, 1250 memory. My other is doing 28.2 at 977mhz core 1250 memory (these are the cards stock settings from factory). edit: I do have ref set to 40 on both, but I don't believe it makes a difference with how much bandwidth they just naturally have, so have it set Just Because.
The 7850 was mining Callisto on SMOS at 17MH/s before it got just a little too big to fit even on linux, the 13MH/s I managed on windows was with a wildly OC'd core and memory with callisto. Expanse was about the same as callisto, Ubiq did better with its smaller DAG (I think its ethash is also a slight modification over normal?? Still don't know for sure). On ubiq I still got 17 on linux, but was able to pull 18MH/s on windows with a high OC.

related to assumptions I made on previous posts, I'm assuming it's not eth, but an ethash coin, right? ETH and ETC won't fit.I've still had it run on a few cards where it doesn't fit using system memory, but at like 2-4MH/s.
the speed on GCN1 and GCN2 cards will go down as DAG size grows, if you're on windows or using the fglrx driver on old linuxes. Radeon HD 7950/7970/R9 280/280X are all GCN1 "Tahiti" cards.
Claymore added a "benchmark" mode for testing how speed will be impacted by different DAG Epochs. (the epochs determine how the size grows)

R9 280 and 280X's are all 3GB. eth and etc won't fit but there's other coins that will, like expanse, ubiq, callisto, and so forth (I asked an admin of wattpool to add the DAG size of the many ethash coins on their pool, and he did so you could check what coins are viable there). There were a few 6GB 7970's which the 280X is based on.
the R9 285/380/380X have 4GB models available.

not just linux, it's the AMDGPU-Pro driver improving things. I was testing an old HD 7850, gets 10-13MH/s on windows and FGLRX on linux, but AMDGPU-Pro on SMOS got me 17-17.7MH/s. HiveOS just refused to use the 7850. SMOS and HiveOS both got me about 27-30MH/s for an R9 290, but only 19-20MH/s on windows. My RX cards were the same on linux distros in general. The RX Cards were the same on linux and windows with compute mode enabled*. linux was doing the same thing as the compute-mode by default, I believe AMDGPU-Pro is basically defaulting to compute-mode behavior for all GCN cards while windows only uses that behavior on GCN3 and up.

lyclminer will do lyra2rev3 on pretty much any old GCN and pre-GCN AMD card, lyra2rev2 was break even during the big boom a while back on my 6870 even, you'll lose a bit now unless you have free power.
as for nvidia.. well, I don't think you're going to have much luck with anything prior to Maxwell, nvidia stuff wasn't great for mining in general before it. Maxwell (the 750 Ti specifically and the whole 900 series) isn't that obsolete, a lot of stuff will run on it fine. With 2GB of VRAM a few ethash coins should fit and run "efficient enough" but not very fast, a little better on linux. Some of the x16r miners probably support it, not sure if it's too late to get in on progpow for BCI but I've tested the ethminer fork on maxwell cards before, I would expect phoenixminer's support of it to work too.
expanse and ubiq are 2 ethash coins I've run on AMD 2GB cards recently. I think ubiq might have some customizations to the algo, but phoenixminer supports it, haven't looked too far into that detail.

edit: for old GCN hardware, my HD 7850 was able to get 17.9MH/s on SMOS mining ubiq. Callisto is what I used to mine on it, but it seemed the 1.75GB DAG wasn't fitting into the vram anymore, even on linux. the same card maxed at 10 at stock on windows, 14 With a high OC.  17.9 on ubiq with 120-140W is below break-even for me. R9 290s get about 30 on linux, but they have 4GB of vram they can mine etc and eth at 28-29MH/s and that has higher revenue. My kill-a-watt died so I can't measure them now, but I'm assuming at -very- high power. I don't have other old hardware like HD 7950 or 280Xs to test.

As far as I've been able to tell, nothing since KBMiner 1.2.2 actually works with Grin? I was looking to see what improvements might have been out there for 4GB AMD cards, but it seems like that's it, excluding lolminer somehow doing the c31 algo on them. did kbminer actually drop support for c29 or did it just change something making it incompatible with old configs?

I have 2 R9 290's up right now, doing 28-29MH/s on SMOS mining etc... with phoenix miner, as I wait for claymore's current version to be available for SMOS, but the older version isn't that far behind phoenix. They do NOT run that fast on windows, excluding with callisto and expanse, which last I checked also are still mineable on 2GB cards. My HD 7850 was getting 17.7MH/s on callisto a few months ago on linux and 12-14 on windows. EDIT: to be clear, this is AMDGPU-PRO drivers on smos/linux and not fglrx. fglrx behaves the same as windows with reduced hashrate. edit2: You can't do undervolting/overclocking/etc. via the driver on these old cards. You have to do vbios edits, 290's have Hawaii bios editor to make that easy. 78x0/270'/370s and 79x0/280's will have VBE7. it seems like there may be a cap in place in the driver, probably in the Quirks portion of the driver. so you can change core and voltage but not memory via the vbios edits.

won't even work on all of the HD 7000 series now it seems, because everything under the 7750 is actually TeraScale. and the R5 235X and under is also terascale, isn't AMD's branding great?
edit: unrelated, but also hilarious I noticed I'm still a "newbie" even though I signed up for bitcointalk in '13, and somehow have only made ~30 posts in that time edit2: and suddenly now I'm a jr member after saying that.

confirmed neither xmrig-amd nor xmr-stak are working on a 6870 with CN/r, didn't plug my 5850 in to check it. As a test, Lyclminer 0.2.1 was working on the 6870, but that isn't the algo you're after. (lyclminer is for lyra2rev3)

have you tried xmrig-amd? I could maybe pull my 5850 and 6870 out to test if that doesn't work to figure it out myself

an old thread, but a few things for anyone that runs across it that still cares about using old cards: at least GCN 1 and 2 don't work with the amdgpu way of overclocking, AND some of the cards have "quirks" coded into the driver that sets a max speed, so even a vbios mod to, say, take the memory of a 7850 and run it at 1500mhz won't work because it's coded into the driver to not allow it over 1200mhz, Core clock was also maxed out at one point but I think that got lifted on the 7850. It's possible to mod that part of the driver even with the amdgpu-pro one.. once that's edited, you can change clocks and voltages for cards in the vbios. hex editing and VBE7 are the things to do that for pitcairn (7850, 7870, r7 265 r9 270/270x and r7 370.) tahiti (7950, 7970, 7990, 7870 XT, 280, 280X). I'd expect it to work on 7750 and 7770 too, but not 7790, as 7790 is actually GCN 2 like the 290(X) and 390(X) are. Not sure if Hawaii Bios Editor can handle the 7790, but otherwise that's the tool for those. GCN 3 cards, like the R9 285 and 380.. not sure if overclocking works with the amdgpu way, and I'm unsure what vbios editing tools work with them.

edit: as for the 7870 XT, which is different from the 7870, it's got a Tahiti core stripped down to a 256bit bus like Pitcairn but has more compute units and better FP64 performance on those units than Pitcairn has.