Topic: Claymore's ZCash/BTG AMD GPU Miner v12.6 (Windows/Linux) - page 317. (Read 3839163 times)

I don't have Tahiti....but we realize what kind of person you are!!!
Long "live" your brain

I will release new version in 1-2 days. Not all cards will get speedup, but at least Hawaii and Polaris will.

lets forget it for tahiti, there is no speed up anymore, its meant back to the grave
hahahaha
long live rx

Good thing you asked. Now he'll know to release immediately.

Claymore say something ?

I will release new version in 1-2 days. Not all cards will get speedup, but at least Hawaii and Polaris will.

I am planning on building a mining rig with more than 8 gpus. I've bought 1 to 4 pci express splitters but I had no luck getting the motherboards to boot with more gpus than the number of its actual physical pcie ports. (tried z87, h97, h81, b150). The person who sold these to me said he heard ASROCK X99 EXTREME supports up to 32 GPUS.
Now I've seen somewhere on the ethereum dual miner thread that somebody managed to use around 18?, i think, amd cards on linux, but I cannot find that post anymore.
Anyone have any info on this? Will a motherboard with X79 chipset be just as good, as they have the same number of lanes? Or it depends more on the bios ?They are rather expensive and I want to hear some opinions before I throw my money.

Yes, the mem timings patch does work indeed, but.. It depends on your card whether it is OK for you or not. This patch has different memory straps than my stock BIOS and Stilt timings that seem to be too much for my card.
I have re-branded 7950 i.e. R9 280 and I am running it at 1000/1500, undervolted. With timings patch it went from 185H/s to 195, but was not stable any more. Tried other clocks and voltages too, but no luck, it was able to mine couple of hours at best before stopping. Then I decided to do timings tweaks to my stock BIOS by myself and result is also 195H/s, but 100% stable. I was able to get 200 H/s with the same clocks and even tighter timings, but then it was again unstable. So I left it at 195, tested also other algos, real world apps and Furmark, all good. It would do over 200H/s with higher GPU clock, but I like to keep it cool and quiet. With 1000/1500 it works at ~65C with 36-39% fan speed.
With similar timings mod I was able to speed up R7 370 1175/1500 from 140H/s to 155 H/s and R9 290 1000/1250 from 275 H/s to 295 H/s.
I tested different driver versions with these mods and for me latest 16.12.1 drivers work the best. They are very slightly faster than 16.11.2 and 16.2.1 I used before, just 1-2 more H/s. Maybe it depends on BIOS mods, but for me 15.12 is 4-7 H/s per card slower than 16.12.1

I did some overclocking to make sure both cards would yield the same results in Catalyst 15.11. I increased the GPU and memory clock of one of the cards. As you can see this gives me 200H/s per card.
check :http://imgur.com/a/7D1Et

I've been thinking of trying two more things to increase the H/s:

- updating catalyst to the latest version
- Trying this:
http://www.overclock.net/t/1554360/tahiti-memory-timings-patch-for-hynix-vram
It seems there is a patch for the Tahiti Memory Timings which seems to increase the speed. Now, this is all a bit technical for me and I don't really know what it does exactly, but the results look promising. This only works for the Tahiti cards though (HD7950), like mine.

Most miner software doesn't support more than 8 cards. (hardcoded in the client). I ccminer sp-mod I support 32 cards, but NVIDIA only.