I have one r9 290 and a hd 5770

my settings

setx GPU_MAX_ALLOC_PERCENT 100
setx GPU_USE_SYNC_OBJECTS 1
vertminer.exe --scrypt-vert -o stratum+tcp://rt2-stratum.hashfever.com:3274 -u xxxxx -p xxxx -g 1 -w 256 --expiry 0 --scan-time 0 --thread-concurrency 14000,3100 -I 14 --lookup-gap 2 --auto-fan --temp-target 85 --temp-overheat 91 --gpu-engine 1000,880 --gpu-memclock 1500,1250 --gpu-powertune 20

I'm getting a lot of hw errors from r9 290 even though I reduce tc values. I have just 4 gb ram.

Any suggest? Thanks