65C is that idle or full load temp? if that's full load, then you're fine, if that's idle, then you're not, AMD chips aren't meant to go beyond 80C. If that's your idle temp, then make sure the heatsink's properly installed, make sure the stock pad's doing its job. If it's still really hot, i would contact the retailer you purchased your product from. I wouldn't use Arctic Silver because i've heard it voids the warranty. So use Arctic Ceramique or Arctic Alumina if you want to use better thermal compound.
-AMD Athlon64 3200+@2300mhz -3x512 Hynix PC3200 ram@192mhz 2.5-3-3-7 -Albatron 5900PV @ 509/1000 -SB Audigy -Adaptec 1210SA Raid -2x120G Seagate SATA150 7200.7 HDD Raid0 -Enermax 460watt psu