Compaq Presario v6346ea: Which type of SATA controller?

I've recently bought an Intel X25-M/G2 Solid State Drive and was expecting read speeds of 200 MB/s on my Compaq Presario v6346ea notebook. Instead of that the maximum speed I get from CrystalDiskMark is 135 MB/s.
Now I'm suspecting the SATA controller of my notebook to not being able to handle the speeds of this Solid State Drive.
I've looked on HP's website to find out which type of SATA controller is used in my Compaq Presario v6346ea but can't find find any clear info on that subject.
From what I read at http://en.wikipedia.org/wiki/Serial_ATA there are 3 types:
SATA Revision 1.0 (SATA 1.5Gb/s, max 150 MB/s throughput minus overhead.)
SATA Revision 2.0 (SATA 3Gb/s, max 300 MB/s minus overhead.)
SATA Revision 3.0 (SATA 6Gb/s, max 600 MB/s and up minus overhead)
Does anybody know which type of SATA controller is used in this Compaq Presario v6346ea notebook?

Thank you for the additional info. I ran SISoft Snadra and found some interesting stuff. For instance, it IDed the chipset as a mcp78s not a mcp77. It also indicates that it can use DDR3 memory. I'm not sure if that's accurate, as it conflicts with specs I've read elsewhere. If true, I wish I'd known that when I upgraded my RAM to 8GB. :-p Anyway, I've tried to determine the SATA revision, but I'm not sure if I'm going about it the right way. I went to "Storage Devices" and clicked the only available button: "Physical Disks , Storage adapters and devices". From there I can choose my internal hard drive from a menu, and it shows the maximum SATA mode as G2 / SATA300. But I'm not sure if this is in reference to the controller or the drive. I know that the drive is a SATA-II, so it would show that if it's displaying the drive's capabilities. It certainly tells me everything else I'd ever want to know about the drive. When I switch to my external USB HDD, it shows the maximum SATA as G3 / SATA600. For the DVD drive it shows G1 / SATA150. So I kind of think it's showing me the maximum capabilities of the drives, not the controllers.  Is there some other way to check the maximum SATA capabilities of the hard drive controller? Sorry. I'm not too familiar with SISoft Sandra, and it's not really obvious to me. And given what it's turned up about the chipset and the memory support, I want to be sure here. Thanks.

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