Hello! Take it from someone with 40 years of experience:
FORGET THE PCI SLOT, MAN! FORGET IT!!!
You've got an (aging) P45 chipset with 2 x PCI-E 2.0 x16 slots:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128433&Tpk=N82E16813128433
(read the Specifications!)
Expansion Slots
PCI Express 2.0 x16 2 (x16/x0 or x8/x8)
With both in use, you get x8/x8 lanes (eight PCI-E Gen2 lanes for each slot
@ 500 MB/second per lane = 4 Gigabytes/second bandwidth i.e. MAX HEADROOM).
> all I got left is one PCIe. But I need something with 8 sata slots
So, take a look at something like this Highpoint 2720,
which has an x8 lane edge connector in PCI-E Gen2 mode:
http://www.newegg.com/Product/Product.aspx?Item=N82E16816115079&Tpk=N82E16816115079
... very reasonably priced for what you get,
assuming your second x16 slot is currently empty.
You may need to get their SATA "fan-out" cable,
because the 2 ports on that controller are SFF-8087,
and the cables Highpoint sells with that controller
have the same connector at both ends (click on
"Image Viewer" at Newegg). Newegg has the
correct "fan-out" cable here:
http://www.newegg.com/Product/Product.aspx?Item=N82E16816115064&Tpk=N82E16816115064
Just be aware that these 4 SATA cables are a bit long; however,
you can get shorter cables with the same connectors at each end
because the SFF-8087 is a very standard cable specification.
"SFF" means Small Form Factor.
Did I say: FORGET THE PCI SLOT???
MRFS