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SATA 3 drive on SATA 2 board

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November 7, 2011 9:00:23 PM

I understand that this is a topic that has been discussed before, I've been reading up on it at several places (here included).


I've just purchased a Corsair 120GB Force 3 CSSD-F120GB3-BK and only afterwards (like a moron) I noticed that the drive was SATA 3 6Gb/s and my motherboard (GA-P55-USB3) only has SATA2 3Gb/s ports.


I've seen that there are PCI-e - SATA3 adapters, but I've also seen that this will most likely drop the SATA multiplier on my GPU from 16x to 8x and as I use my machine for gaming (I'm getting an SSD to improve performance of texture streaming in BF3, among other things) this isn't ideal.

I have also read (from an unverified source) that if you have a motherboard with PCI Express slots rated lower than 2.0 then SATA 3 drives wont operate any better than SATA 2 drives anyway and as far as I can tell my motherboard only has one 2.0, which is currently in use by my GPU.

So my main question is; how much difference will I notice between using the SSD at SATA2 and using an adaptor to run it at SATA3, and would you think it would be worth it overall?

Thanks,

Dave

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November 7, 2011 10:24:29 PM

you may notice some difference, however it wont be nearly as drastic as the difference you will notice going from a mechanical HD to a SSD. in game performance should not be affected by sata 3gbs vs 6gbs but load times in games and boot times most likely will be. its up to you if that trade off is worth potentially losing a few fps (many will argue that a pcie 2.0 8x connection is plenty for pretty much every single gpu card out there and they would have a point)
a c 238 V Motherboard
a c 167 G Storage
November 7, 2011 10:39:11 PM

Do not even bother with an adapter.

The benefit of a ssd comes from random access times which are some 50x faster than a hard drive. That is what the os does mostly.

Sequential processing may be 2-3x faster than a hard drive, and you will lose very little at sata 2 speeds.

You will not notice any difference with real apps, only synthetic benchmarks will detect the difference.

Do take the time to see that you are able to use "trim". Trim improves the efficiency of writes, particularly as the ssd fills up.

Set the sata mode to AHCI in the bios.

Also don't bother with "tweaks", they are really not worth it.
Just install the drive and enjoy it.
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a c 106 V Motherboard
a b G Storage
November 7, 2011 11:03:10 PM

You can run the ssd in your sata 2 port but will run at sata 2 speeds as sata 3 is backwards compatible. But if you wish to use a pcie to sata adapter, your mobo is x16/x4 so your gpu will not slow down. Pcie 2.0 is 1GB/s per lane.

That ssd is rated at 550/510MB/s read/write while sata 2's limit is around 280/260MB/s. It is important to note that these are max sequential speeds and most of the time will hardly reach those speeds. http://www.legitreviews.com/article/1723/6/ (averaging 14-200MB/s) So will you notice a difference? No not really except transferring large files. As geofelt said the main benefit is access times, just plug it in your sata ports and don't bother with a pcie adapter.
a b V Motherboard
a c 283 G Storage
November 8, 2011 3:08:32 AM

Looks like you did your homework. The information you posted is correct.

There are no economical consumer oriented PCI-e based SATA 3 6Gb/s add-on cards that work well. Most of them use older controllers.

There are enterprise oriented add-on cards that work exceptionally well but they are expensive. Prices for the really goods ones start around $1,600.00.
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