Nbox N5900SP NEED HELP PLEASE

HI FOLKS
I ve just bought this card and installed. I used the drivers cd, when i reboot the computer after few minutes some green dots and vertical stripes apeared on the desktop so i reboot again it was ok and i start playing the game call pain killer about 10 minutes later dots and stripes apeared again its doing this even when i reboot the computer during the reboot on bios screen and motherboard logo screen the dots are green and the stripes white.
Also memory clock is on 700 [default] if i make it higher or lower than that on msi clocking features which is on where desktop settings are [you guys would know what i m on about] anyway higher then 700 like 850 all the graphichs goes funny
and this dots and stripes all all over the screen and computer frozes.
where am i doing wrong? Right now i ve got my old 5200 installed and i ve got no problems like that.
this is my spec:
amd xp 2800 [runs cool]
A7V8X-X  asus motherboard [ latest driver and bios]
1 gig ddr ram
N5900sp 256ddr Nbox
120 Maxtor 7200rpm 8mb cache hdd
Msi Tv anywhere tv/video capture card.
psu 300watt
by the way do you guys think power supply being 300 watt might cause this problems?
or is the card faulty?  
Any ideas please post THANKS

Hi Guys
i bought 450watt enermax as you guys offered but I ve still got the same problem it really makes crazy I dunno what to do .
I contact with the company who i bought the card , they told me to send it back for test if its foulty they said they will replaced so lets what is going to happen i hope its not about my spec as I ve got the new power suppy i cant think what else can cause this. If you have any more ideas please share with me THANKS.

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