Rambus is significantally faster than SDRAM, as any test between the Intel i845 (SDRAM) and i850 (RDRAM) chipsets will show. PC800 Rambus has a bandwidth of up to 3.2GB/sec under Intel's dual-channel i850 design. PC133 SDRAM, on the other hand, has a bandwidth of approximately 1.06GB/sec. Rambus does have a higher latency though (the time it takes for the memory to perform the access in the first place), which is why you won't see anywhere near a 3x performance improvement by going from SDRAM to Rambus. Read Anandtech's review on the i845 chipset to get an idea of how much a performance hit you will take by configuring a system with PC133 as opposed to Rambus.
Once you get into DDR SDRAM, though, that's a different story. A SiS 645 chipset with PC2700 DDR RAM will probably outpace (or at least come darn close to outpacing) an i850 board with Rambus, even though it has slightly lower bandwidth (2.7GB/sec for the PC2700 as opposed to 3.2GB/sec for the Rambus). Plus, most of us hardware geeks are opposed to Rambus as a company anyway for filing all those idiotic patent lawsuits claiming that they "owned" SDRAM technology and that all memory companies would have to pay them royalities.
Oh, and just for future reference: SDRAM and static memory are not the same thing, so your title is a little off.
Nick