Hi,
I know this tread is old but I think it still a subject that can appreciate
The last test I ran give me
7.7 with my Corsair F90
Its run on a Windows 7 Ultimate 64 bits
First think I want to say, its that with SSD you can get random result, like really random.
The first test I ran after my windows and driver install give me 7.3
I install windows in IDE mode so I activate the ACHI today and after that I drop at
5.9. I panic and check around what can be wrong, reinstalling all kind of driver and play with a lot of setting but still the same thing since 5 minute ago but for no reason except one.
SSD have random performance for 1 good reason.
Its in the writing process. If you lucky the ssd just have to write the data. If you not it will have to do an Erase/Move/Write operation.
Here I got to test done by CrystalDiskMark. Both test have been done in a 10 minutes interval. No reboot. No antivirus active.
TEST 1
Sequential Read : 155.421 MB/s
Sequential Write :
133.640 MB/s
Random Read 512KB : 150.439 MB/s
Random Write 512KB :
133.566 MB/s
Random Read 4KB (QD=1) : 28.191 MB/s [ 6882.6 IOPS]
Random Write 4KB (QD=1) :
77.603 MB/s [ 18946.0 IOPS]
Random Read 4KB (QD=32) : 136.800 MB/s [ 33398.4 IOPS]
Random Write 4KB (QD=32) :
131.669 MB/s [ 32145.7 IOPS]
TEST 2
Sequential Read : 153.054 MB/s
Sequential Write :
52.764 MB/s
Random Read 512KB : 148.129 MB/s
Random Write 512KB :
49.126 MB/s
Random Read 4KB (QD=1) : 20.916 MB/s [ 5106.4 IOPS]
Random Write 4KB (QD=1) :
49.925 MB/s [ 12188.7 IOPS]
Random Read 4KB (QD=32) : 105.839 MB/s [ 25839.6 IOPS]
Random Write 4KB (QD=32) :
46.576 MB/s [ 11371.2 IOPS]
You can also read this source :
source
An SSD write operation may also require a NAND erase operation and move data from one NAND block to another. These involve multiple page writes and block-erase operations, which will slow down the SSD write operation even more
Maybe I'm wrong and it slow down for a completly different reason but its weird..
My Config:
Windows 7 Ult 64bits
Intel Core i7 950 3.06@3840Ghz (fresh by Corsair H50)
12GB (3x4GB) DDR3 1333 @640Mhz 9-9-9-21 (3200Mhz Triple channel)
MotherBoard Gigabyte X58A-UD3R [X58 chipset, ICH10R Southbridge] (support SATA3 & USB3)
Ati Radeon HD4850 512Mb (my old card
)
Corsair SSD Force 90 (Boot, windows)
WD Caviar Green 2TO (pagefile, user profil, data)