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cugar124
12th July 2012, 09:48
Hi Guys
Need some advice:

I have updated my PC over the last few weeks and have an issue I want to figure out, I have a new OCZ Sata 3 SSD my Motherboard is an MSI P55 board which is Sata 2. What I am trying to find out is what's the best controller card to buy to give me Sata 3.

I have looked at some review sites only to be told that the cheap PCI-E cards are no good because they bottle neck.

http://www.ebay.co.uk/itm/120931949943?ssPageName=STRK:MEWAX:IT&_trksid=p3984.m1423.l2649#ht_3250wt_1396

http://thessdreview.com/Forums/storage-controllers/2055.htm

Anyone any views that might help

BLTCON0
12th July 2012, 10:46
It's really simple math.
SATA 3 bus bandwidth = 6 Gbps = 600 MBps
1x PCIe = 250 MBps

All things equal, the limited bus bandwidth means the 64 MB buffer typically found in SATA3 drives will take twice+ long to empty, acting like a 32- MB buffer in full speed. But you don't really see SATA3 drives with 32 MB buffers.

For a single drive it's no big loss actually - just say your fast SATA3 drive is running like a fast SATA2 one, but if you hook two fast drives you're definitely going to see performance drops when simultaneously used.

EDIT: Ooops, didn't see you're using a SATA3 SSD drive, what I wrote is about regular hard drives :) For SATA3 SSD I'd say just use it in SATA2 mode on your motherboard's native controller (or get a 4xPCIe SATA3 controller if possible). With 1xPCIe both the narrower bandwidth and the added overhead will give lower performance compared to running it onboard as SATA2.

tribz
12th July 2012, 11:29
If you need to boot from it, also make sure that is supported.

BLTCON0
12th July 2012, 11:40
^+1

slk486
12th July 2012, 12:27
You would most definitely not notice the bandwidth limit of sata 2, so just use your onboard. You'll gain the seek time, which is alpha on ssd's :thumbsup:

Harrison
12th July 2012, 12:38
Your motherboard's SATA2 ports can achieve 300Mb/s so will still have better performance than any PCI-E card's bandwidth. So as already suggested, just stick with SATA2 for the moment from the motherboard.

Obviously SATA3's 600Mb/s speeds are attractive, but you really won't notice the difference other than during booting the OS, and even then from a SSD it will be fast.

Bad_Ad84
12th July 2012, 12:54
Sata 2 is 300MB/s (Mb is megabits)

I have 2 SATA 2 ssd's in raid 0 and get around 400-450MB/s read. I dont think it being any faster it going to make much difference though - the bottle neck now isnt with the disks at that point.

cugar124
12th July 2012, 12:54
Thanks Guys looks like I am holding off unless someone comes along with a better option LOL.

slk486
12th July 2012, 13:42
I have two Sata 3's in Raid 0 and get around 900-1000, but in all honestly, the only pleasure I get out of that, is when benchmarking.

It's all in the access times and concurrent IO's, baby :cool:

Bad_Ad84
12th July 2012, 13:42
I have two Sata 3's in Raid 0 and get around 900-1000, but in all honestly, the only pleasure I get out of that, is when benchmarking.

It's all in the access times, baby :cool:

Which was pretty much my point :)

slk486
12th July 2012, 13:47
Which was pretty much my point :)

Yes, I was just trying to accentuate it ;)