Why is my hard disk score mush lower than in the chart?

[newdeal]

Ok, so I bought a Seagate 7200.12 500gb drive because it was listed as one of the top drives with a score of 770. I get my drive and put it into my computer and it gets a score ranging from 200 to 300. I am VERY dissappointed in this and can't figure out why it is happening. My system consists of a gigabyte motherboard with the AMD 780 chipset, AMD Athlon X2 7750 processor and really all that I have installed on the system is vista with no other real programs, I have AHCI enabled in the bios and I can't figure out what it could be that is causing such a large differance in scores!

[David (PassMark)]

What's the model number of your drive?

[newdeal]

...

Seagate ST3500418AS which is the top one on the common drives chart. I recently changed the mode in the BIOS from ACHI SATA to Native IDE and that brought my score UP from mid 250s to around 485. Obviously thats a bit more respectable but even so I feel like it should be better since its got a high rating for veryone else. My motherboard has the AMD 780G chipset I wonder if there is some type of problem with it

[David (PassMark)]

Check you have the correct motherboard device drivers. Not having the right drivers means the drive will only use older slower data transfer options.

[newdeal]

..

where would i check for that? With AMD or with Gigabyte?

[David (PassMark)]

If you have a Gigbyte motherboard, then they should supply the device drivers for the motherboard.