VERY slow RAID5 on ICH10R with WDC Green series


I’m having really slow write speeds when copying files.
It starts at ~120mb/s and goes down to ~5mb/s

I’m running windows 7 ultimate x64 with latest intel rapid storage driver v10.1.0.1008
Here’s my rig
Gigabyte P55-UD3R
Intel core i7 860
4x2gb gskill’s ripjaws ddr3 1600mhz cl7
1x 60gb OCZ Vertex 2 for OS
3x WD20EARS version 00MVWB0 with firmware 51.0AB51 (poor raid5)
3x WD10EADS version 00M2B0 with firmware 01.00A01 (poor raid5)

Is there something i’m missing?

How can i test my stuff more further?
are there any optimisations i could try?

Also, i have read a little about TLER not being present on WD green series. Would that affect performance as much as that?
Maybe i should return some and use another brand or model? Any recommendation?

Thx alot

Maybe you should try contacting WD’s Technical Support about this. You can do so either by phone or email.

To Contact WD for Technical Support