Leave your FSB on 133/266 and run the RAM at 133/266 as well. You can use both sticks without any problems. RAM can always run it's rated speeds or lower, so DDR400 can run DDR333 and DDR 266 etc..... I usually don't touch the mobo jumpers, but it depends on the board you have, if you can change the same setting in the BIOS anyway, leave the jumper as is......
There is no point running the RAM faster than the CPU/Motherboard FSB, as there is no "real world" performance gain to be had from doing so. It is pretty much always best to run the CPU and RAM in synch, EG: 1:1 ratio (133/266 for both CPU and RAM)
What you could do if you have good cooling, is try raising the FSB from 133, to 140-ish. That would increase your RAM and CPU speed very slightly and increase performance. You would probably have to raise the CPU vcore voltage a little bit and memory too, possibly the northbridge/southbridge voltage.......
Keep raising the FSB and see where you get, but only by small increases, and always monitoring temps and running stress test within windows to see if everything is stable (google "orthos")
Otherwise you could lower the CPU multipyler, and raise the FSB beyond 133. For example 133x13=1733, or 166x10.5=1740, or 200x8.5=1700....
The last option there would give you the best performance, as you are running the CPU and RAM at 200/400, while keeping the CPU within its rated speed (Your CPU is rated for 1733mhz)
The main thing to remember is TEMPS and voltages, do not push too hard too soon and monitor things closely, it also depends on your motherboards BIOS settings and options, you may be limited by what you can change if it was an "off the shelf" PC. Also the motherboard may not be capable of running 200/400 1:1 synch with RAM/CPU.....
Cheers!