you gain almost nothing because at least 90% are on windows and difficulty increases proportionally, therefore you get 15% of 10% or 1.5% gain.

I think it is cpu related, on my pentium 280x rig i had to turn -i 4 down to 2

using version 8 on a hp proliant dl385 g7 server using win 10pro  and the newest crimson video driver , AMD 8870 is @ 100s/h (190w) and a R9 360 @ 57s/h (100w) for a avg of 150s/h (290w)  total...    wow best hash rates yet!!!  good job claymore!!

and configured with stock settings and no overclock

Claymores V8.0 You've got to be kidding me, No Way !

I can't believe I am getting 210sol/s on my 280x, outstanding work Claymore !

I have the same problem.

a little over 1 hour of mining with CM v8.

7 x RX 480 8GB ASUS Strix - stock clocks and Roms
MSI Z97 motherboard
Intel Celeron 1840
8GB RAM
USB3 powered risers
Windows 10
20GB Page file (manual)
intensity -i 6
eVGA 1600 psu
1081 Watts (average at wall)

GPU #0: Ellesmere, 8192 MB available, 36 compute units
GPU #1: Ellesmere, 8192 MB available, 36 compute units
GPU #2: Ellesmere, 8192 MB available, 36 compute units
GPU #3: Ellesmere, 8192 MB available, 36 compute units
GPU #4: Ellesmere, 8192 MB available, 36 compute units
GPU #5: Ellesmere, 8192 MB available, 36 compute units
GPU #6: Ellesmere, 8192 MB available, 36 compute units
ZEC - Total Speed: 1372.253 H/s, Total Shares: 5494, Rejected: 14, Time: 01:10
ZEC: GPU0 192.734 H/s, GPU1 197.576 H/s, GPU2 196.919 H/s, GPU3 195.264 H/s, GPU4 197.817 H/s, GPU5 195.069 H/s, GPU6 196.874 H/s
Pool switches: ZEC - 0
Current ZEC pool share target: 0x00418937 (diff: 1000H)
GPU0 t=54C fan=46%

Great Work Claymore!!! Looks great so far - Averaging about 196 H/s with stock RX 480

Claymore v8
Windows 7
Catalyst 15.12

 HIS IceQ HD 7870 (the huge-blower-style thing)

Afterburner settings (I prefer the custom fan profile option but do have -tt 5 set to keep an eye on temps)
900/1450 clock
-20 power limit (lowest it will go)

 appx. 110 h/s (I'm guessing h/s is actually solutions/sec)


 Clock anywhere from 900 to 1020 had no noticeable effect on hashrate, maxing out memory clock from the 1250 stock added about 10 h/s


 Card mis-identifies as a "R9 270/270x" in the miner but that's the AMD "recycled most of the HD 78xx/79xx cards to become R9 2xx cards" generational shuffle at work and is not an issue that needs addressing.


 Same card managed 10.5 Mh/s on Ethereum while running noticeably hotter.


 I was hoping to run the R9 280x that was originally in this rig but it appears to have died during my last move.

 Looks like time to reconfigure a couple rigs, 1x R9 280x and 1x R9 290 doesn't seem like a good choice any more on 2 of my old "spare parts" rigs.


 It would be interesting to see what my HD 7750s would manage but it looks like they don't have enough RAM to run this?

2Gb version not necessary,
I have HD7850 1Gb it work fine 95sol on v8