Of course it makes a difference, but it also depends on what mainboard you currently have. It may not be worth buying a 266MHz FSB CPU if it means you have to upgrade your mainboard also, but if you're in the market for a new configuration because your current system needs to be replaced altogether, you may prefer to spend a few extra bucks on the latest that AMD has to offer.
Take into account that to get the most out of your CPU, you should also upgrade to DDR SDRAM. It is probably a waste right now to upgrade to a "C" type processor, and still use regular SDRAM modules; in that case, you probably will not notice enough improvement to justify the cost of a new CPU and mainboard, and would be better off getting a 200MHz FSB CPU and overclocking it, if your current mainboard supports this. One good thing is that DDR SDRAM modules appear to become more affordable in the next few weeks, but I've no clue how much these modules go for are at the moment.
Last but not least, I heard that the 266MHz CPUs don't allow for much "overclocking head room" compared to the 200MHz CPUs. So if you're thinking about doing that, you might want to read up on that first, and try to find out about other people's results from overclocking the "new" CPU.
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I missed that part about which mainboard you have...
Not sure about the price difference between 266MHz CPUs and those that run at 200MHz, but I guess you may well buy a 266MHz chip if you plan to upgrade your mainboard in < 3 - 4 months' time. Else, I guess a 200MHz CPU (overclocked?) will serve you right. It all depends on which models AMD will have available by that time, 'cause you'll prolly not want a 1.2GHz "C" type if 1.5GHz models are available by then...
If you're also gonna upgrade to DDR SDRAM at the same time, get a 266MHz chip. Else, don't bother until you can afford a new mainboard and the DDR SDRAM. (I think your RAM will be the system's bottle-neck; not the CPU's FSB speed.)
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Discussion Zen 5 Speculation (EPYC Turin and Strix Point/Granite Ridge - Ryzen 9000)
Discussion Intel current and future Lakes & Rapids thread
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