My cpu's FSB is too low! Is it safe to up it so drastically?

I'm using an AMD Sempron 64 2800+ 1.65GHz with a 800MHz FSB.

Currently, the CPU is running at 1.65Ghz with 200Mhz FSB.

Is it safe to just up it to 800Mhz FSB so I can get full performance?

ummm......no. :P
if you upped the FSB to 800 MHz, if it would let you, you'd blow that poor Sempron into next week

if you're at 1.6 GHz on a 200 FSB setting, I'd say your multiplier is set at 8
if you upped it to 800, I doubt it's possible, but say you could....
you'd have a 6.4 GHz monster :w00t:

-edit- to make a long story short.....don't try it
try going up maybe 5 MHz, if it takes it, maybe try another 5 MHz, etc...
I don't know about the Sempron 64s, but maybe you can play with the multiplier as well
but fucked if I know if you can get it below 8

ah, I see. Well I don't need to extra speed after all. I found my games run "much" faster when I play around with Nvidia's application settings. I've set up custom profiles for all my games and they all run in the 60-80s when it comes to frames per second. good stuff.

800MHz FSB is the HyperTransport speed.
200MHz is the external clock speed.

The HT speed is a multiple of the external clock speed, default 4x or 5x depending on the motherboard and cpu; obviously 4x in your case.

The Athlon 64 3000+ runs at 1.8 GHz as standard, so 1.65 GHz for the Sempron 2800+ sounds about right.

Well, my new 7800GT video card is so fast the CPU doesn't slow down my fps one bit.
Kinda wish I went with the 939 socket mobo instead, but that was a little overboard my expenses. I'll save up for later and sell this current one on ebay like I always do with my old parts. Muhohahaha.