Asus M2N VM HDMI + 9800 GT bad?

[Styxx]

Hi, this is my first post after reading quite some. I have a 9800GT (Gainward, 512MB, not OC) and an Asus M2N VM HDMI mobo, but I wonder whether this is a good combo or not, since my mobo only has a PCIe x16 slot, and not PCIe 2.0.
I've also read that only the latest GPUs actually use the full bandwidth of PCIe 2.0 and I'm not going to buy things I don't need so I hope you guys can help me out. Here's a list of what I have:

Windows Vista Home Premium 32-bit
2x 1Gb Kingston DDR2-800 RAM
Asus M2N VM HDMI
Gainward 9800 GT 512MB
AMD Athlon 64 X2 5200+ (2.7GHz)
and the rest is probably irrelevant...

I haven't OCed anything and I don't know how it works and how big the risks are. I'm also thinking about upgrading my system (only minor changes, like more RAM or a little more expencive mobo) and I'm not that familiar with hardware... If anyone can tell me what I should buy first (I think another Gb RAM), any help is appreciated. I don't really understand why 1066MHz RAM is more expencive, while it has worse timings than 800MHz.

Sorry for my English if I misspelled something or w/e and sorry if this is the wrong place to post this question.

 

[Styxx]

Please, I really need help on this.

 

[azri2ayie]

Please, I really need help on this.

in your manual book does it state what version for your pcie x16?
my mobo is m2n vm dvi and it does support 2.0 version..do more reading on your manual because it work for me..
about ur gpu 4 me as long as u are using the graphic card which is same to ur chipset = is d best..

p/s:- please correct if im mislead in any info tq..