850 PRO *slower* after upgrading to SATA 3 PCI card!

tfield98

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Jul 25, 2014
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I've been running a 500 gig SSD 850 Pro since they came out. On a P7P55D motherboard on Windows 7.

Speeds were as expected, just below 300 MB/s since I didn't have SATA 6.

I just installed a StarTech SATA 6 Gbps PCI Express SATA card, expecting to get an almost two-fold bump in speed. I watched its drivers installed when I rebooted. (And rebooted again like Windows told me to do.)

Samsung Magician and CDM show the speed is now slower than it was before I "upgraded" to the StarTech card.

It's now Sequential 200 Read, 131 Write. Formerly, both were at about 280.

Magician Sata Interface panels shows "SATA 6Gb/s(SATA 3)".

I used CTRL m at boot time to view the StarTech setup, but didn't understand any of the parameters.

I'm basically an "appliance operator" -- I don't really understand WTF I'm doing.

Any suggestions on how to get the SSD up closer to the 600 I'm expecting?

TIA
 
Solution
I think the problem is your MB PCI Express 2.0 x1 slot, it has the 2.5GT/s ( or = 250 MB/s ) transfer rate http://www.asus.com/Motherboards/P7P55D/specifications/
So you are better to use the MB sata II port for your SSD, in the real world you are fine, you can only see the performance difference between sataII and sataIII in the benchmark.
Review "Upgrade Advice: Does Your Fast SSD Really Need SATA 6Gb/s? " http://www.tomshardware.com/reviews/sata-6gbps-performance-sata-3gbps,3110.html
I think the problem is your MB PCI Express 2.0 x1 slot, it has the 2.5GT/s ( or = 250 MB/s ) transfer rate http://www.asus.com/Motherboards/P7P55D/specifications/
So you are better to use the MB sata II port for your SSD, in the real world you are fine, you can only see the performance difference between sataII and sataIII in the benchmark.
Review "Upgrade Advice: Does Your Fast SSD Really Need SATA 6Gb/s? " http://www.tomshardware.com/reviews/sata-6gbps-performance-sata-3gbps,3110.html
 
Solution

tfield98

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Jul 25, 2014
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4,510


Thank you for providing this helpful link and answer, cin19. That's exactly the information I was looking for.