Quick question. I'm running FSX on a dinosaur but with rather nice results. Frame rates are not spectacular but adequate for the dinosaur. 12-13. Thing is, every 2 minutes, the frame rate drops from 13 to 1.5 etc. After about 30 seconds it "works its way out of it" and returns to normal. This can't be because it's a dinosaur otherwise I'd be getting ALL slow frame rates. I have an old Nvidea 4600., Is it possibly broken? I wouldn't doubt it but I'd like to hear from someone who may have had this exact problem. I'd be quite pleased if that WERE it as I'm planning to replace it at Christmas. I have 1.5 GIG ram, and a Pent 4, 2.56 gHz processor. I must mention that it worked fine for weeks before this problem happened. If you can solve this I'll be a happy chappy. Good flying everyone. Diz