have no idea what happened but performance clearly dropped . i hope it did not changed videocard bios or something.
I checked logs old logs for my 7950 / win 8.1
"Claymore's ZCash AMD GPU Miner v12.5"
before installing nicehash 2.0.0.7
ZEC - Total Speed: 267.107 H/s
something around 260+/255 ish definitely. with wow classic running on low or with browser was getting like 230-240.
after installing nicehash 2.0.0.7
ZEC - Total Speed: 239.876 (it starts fast but gets slower and slower and slower to this numbers)
now for example same version that was shipped with 1.7.5.13 shows only 238... below 240. i can close browser and there is no small games running ... and it will be below 240 anyway.
nothing changed in system at all. same driver. no updates.
same clock speed. same bat file. same program.
same everything. somehow new 2.0.0.7 version installation "cripped" my card.
Uninstalling nicehash 2 and rebooting is not helping. Also card runs 2 degrees lower.
p.s.
For some reason effect persists even on win 10. and i didn't installed 2.0.0.7 on it. really strange.
same Claymore's ZCash AMD GPU Miner v12.5 +same bat. now i just get lower numbers.... but was getting 260+ stable (without additional load) for 3 days of using that 12.5 version.
Its really not messing with bios or power management settings
i thought it can be insensitivity drop... but nope... it was running on "6". running with "7" insensitivity not helping too anyway.
Littterally it was showing around 265-267 sols/s when i stopped nicehash 1.7.5.13..... seconds before installing/uninstalling 2.0.0.7..... and after that even old nicehash 1.7.5.13 shows 236/239.7.
it just doesn't "stabilize" on higher number of sol/s as it was before installation of new alpha version.