Updated miner to 3.8 via hive official update
Issue with funny hashrate appeared: my 470s and 570 report 1.6-1.8kH hashrate each while avg is lower than before the update
at the same time my 580 reports some 2 hashes increase while having the same 1030 kH as before the update
clocks are OK with the old version

Guys, does pool hashrate (reported by miner) reflect HWs?

GPU's MODEL NAME: Sapphire r9 280 Dual-x
VRAM: 3Gb
CORE/MEMORY CLOCK:  1070/1350
HASHRATE:  290 Sols/s
MINER SOFTWARE: Claymore's ZCash AMD GPU Miner v12.6
OS: Windows 10 x64

GPU Radeon HD 7950
GPU's MODEL NAME: Sapphire 7950 Dual X
VRAM: 3GB
CORE/MEMORY CLOCK: 1100/1500
HASHRATE: 280 h/s
MINER SOFTWARE: Claymore V12.5
OS: Windows 10 x64

GPU Radeon HD 7770
GPU's MODEL NAME: Sapphire 7770 1GB
VRAM: 1GB
CORE/MEMORY CLOCK: 1000/1250
HASHRATE: 80 h/s
MINER SOFTWARE: Claymore V12.5
OS: Windows 10 x64

GPU Radeon HD 7750
GPU's MODEL NAME: PowerColor 7750
VRAM: 1GB
CORE/MEMORY CLOCK: 1000/1125
HASHRATE: 70 h/s
MINER SOFTWARE: Claymore V12.5
OS: Windows 10 x64