System AMD X6
12GB RAM, GTX660
SSD Sandisk Plus (OS: Win7 64bit)
SSD Intel (OS: XP 32bit)
1TB HDD Toshiba
I upgraded from the 120GB Sandisk Plus to the 240GB Sandisk Plus, because I was thinking the bigger version must be faster.
Well, I was wrong - the 240GB Sandisk is a lot slower. ^^
New Sandisk Plus 240GB (fresh Win7 Install)
Win7 64bit AHCI Mode: 231mb/s read - 100mb/s write
Win7 64bit Native IDE Mode: 211mb/s read - 180mb/s write
If you dont believe it: http://www.fotos-hochladen.net/uploads/sandisk92ec5ak87y.jpg
Look at the screenshot, just 100mb/s seq write under AHCI, this is really worst, even my old Toshiba HDD performs better.
Old Intel 240GB SSD (same PC, same OS)
Win7 64bit AHCI Mode: 257mb/s read - 208mb/s write
Win7 64bit Native IDE Mode: 184mb/s read - 182mb/s write
I added the Intel as compare if this proofs nothing is wrong with my OS or mainboard.
The Intel (same for the 120GB Sandisk) perform like it should be = they are faster in AHCI Mode and slower in IDE Mode.
Just the 240GB Sandisk version is slow like a turtle under Win7/AHCI and this makes me so curious that I finally tested it also under Windows XP:
Sandisk Plus 240GB (XP 32 bit - IDE Mode):
241mb/s read / 203mb/s write
Unbelievible, but true - the Sandisk performs best under the old XP + IDE Mode ^^
Well, since there is no Sandisk trim tool for XP = the Sandisk is not good for XP in the long run - but on the other side, this SSD is also not any good for Win7+AHCI if the write performance is so bad & slow.
So my questions are:
Why has the 240GB Sandisk such pretty poor Win7+AHCI performance ???
Why is there no (XP) trim tool?