Does anyone have any insight on why my single R9 290 never seems to submit as many shares as any of my 280x cards (GPU2 vs GPU0 and GPU1 in the screenshots below)? It runs very stable at 445Kh/s, but has about 20% less shares that the two 280x toxics I have running on the same rig at 387Kh/s. The 290 is still 10-15% lower in shares than some of my other 280s that run at ~360Kh/s. These are separate instances of vertminer running on the same machine, since I'm running 1 thread for the 290 and two threads for the 280s. Also, I'm currently mining EXE, but I use identical settings for VTC and have identical results.
toxics:
290:
toxics:
Code:
./vertminer --scrypt-vert -d 0,1 -g 2 -w 256,256 -I 13,13,20 --thread-concurrency 8192,8192 --lookup-gap 2,2 --gpu-engine 1080,1080 --temp-target 72,72 --gpu-memclock 1500,1500 --gpu-vddc 1.2,1.2 --auto-fan --gpu-powertune 20,20 --queue 2 --scan-time 5
290:
Code:
./vertminer --scrypt-vert -d 2 -g 1 -w 256 -I 13,13,20 --thread-concurrency 24550 --gpu-engine 1080,1080,1000 --gpu-memclock=1500 --gpu-powertune 20 --queue 2 --scan-time 5
simple.. vardiff.
variable difficulty is most likely used on the pool your connected to it's common these days..
i have an Nvidia 550Ti and an ATI 7950 both mining VTC and the nvidia card Always submits far more shares
and when i look at my workers you can see the difficulty used on the two workers is much lower on the Nvidia card.
SO the pool is letting the slower card do easier work basically and making your more powerful card do harder work (hashing).
edit:
I have experimented for a while using cgwatcher to force a restart of the miner every 10/15 minutes but i am not sure that makes any worthwhile difference.
I am pretty sure it increased my submitted share count because it said so in the stats (you can see it on Monitor tab middle of the page where it says your submitting x per sec.)
what that does is force the pool to start over giving you easy shares at the start and by the time it figures out your card is powerful your miner has rebooted lol
I said earlier cgwatcher has some pretty nice features guys
