[Solved] Solid state drive reading at half the advertised speed but writing

Just bought an ssd about 3 or 4 days ago and only ran the benchmarks now and noticed that is reading at about half of what it should be while it is writing at the advertised speeds. I have made sure it is in AHCI mode as well as made sure it is aligned. Any help would be appreciated before i RMA this back to newegg and hope for a better one. It is connected with a sata 3 6gb/s cable and the motherboard supports sata 3. it is a gigabyte ga-p55-ud4p and the SSD is a plextor m3 128gb

What OS?

Are you sure Trim is on?

What are you using to test the speeds?

If you hit a drive hard with lots of benchmarks it can effect its speed until trip or its own firmware has cleaned it up to restore performance.

It actually was plugged into a 3gb/s port and just plugged it into the 6gb port and its going a little faster now but still not what it is advertised at. was at about 250 before and now its 375 or so. The benchmarks im using are the ones that came on the cd included with the SSD, and that german one called An SSD Benchmark. OS is windows 7 64 bit and i have confirmed that trim is enabled. I'm thinking i might have to format the drive and reinstall windows because maybe it didnt use the right drivers since i was plugged into the wrong sata port. Or maybe i should put the mobo cd back in and itll update them? I noticed that when i plugged it into the other slot and put the computer back on it tried to install a bunch of stuff and it all passed except the very last condition of about 10 that said " Marvell 91xx config ATA device - no driver found ". Thanks for all the fast replies guys, much appreciated.

the plextor firmware is up to date and i just updated my marvell drivers and it didnt increase the speeds

when i check in device manager there is still the yellow caution sign thing under the other devices tab with Marvell 91xx ATA Device, so i dont think so.

thanks alot for the help vollman, hopefully someone will come and give one

One more question: did you enable Marvell in your bios?

there isnt any option in bios to enable/disable the marvell controller so i assume its enabled

there arent any drivers for the ssd, only for the chipset on the mobo and thats updated

the error message saying marvell 91xx ata device driver not found isnt coming up any more

thats the one i changed from that caused it to jump by about 100 mb/s. they only go 3gb/s as opposed to the marvell ones at 6gb/s

So do you think 375 is the highest ill be able to get on 500mb/s advertised speeds with this mobo? also the random 4k read/writes are awful. When i run An SSD Benchmark i get 40mb writes, 23mb reads for 4k and for 4k-64thrd i get 183 reads and 110 writes. also says my read access times are 0.121ms and write 0.086ms. Thanks again vollman and everyone else for helping

Best answer selected by bliss421.