What matters about memory is THE BANDWIDTH, not the clock or timings per se. To increase bandwidth you need to increase the FSB and decrease timings. Memory clock per se doesn't matter in case of AMD setups, for the best results (i.e. bandwidth) it should be 1:1 with the processor. If the clock is higher than 2xFSB you will gain very little and the trade off might be stability of the setup so it is not worth at all to do that. Plus it also introduces latencies per clock which actually decreases real life performance. Therefore for a little gain (say 1-2%) on the bandwidth you might lose stability and performance.
The only gain YOU get with Winbond is that you have good (low) timings. If you buy any memory that can do 2-2-2-6 on 266 MHz you would likely have similar bandwidth. A lot of PC2100 and most of PC2700 memory can do that.
To get the full benefit from Winbond you need to get 200 MHz FSB motherboard, like solid NForce2 Ultra (Abit, Asus DX, Soltek) or KT600 (Abit, Giga-Byte, Soltek). Your board won't do that.